Zeitschriftenartikel: „Promoting rhizobacteria“

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Kashyap, Abhijeet Shankar, Nazia Manzar, Mahendra Vikram Singh Rajawat, Amit Kumar Kesharwani, Ravinder Pal Singh, S. C. Dubey, Debasis Pattanayak, Shri Dhar, S. K. Lal und Dinesh Singh. „Screening and Biocontrol Potential of Rhizobacteria Native to Gangetic Plains and Hilly Regions to Induce Systemic Resistance and Promote Plant Growth in Chilli against Bacterial Wilt Disease“. Plants 10, Nr. 10 (07.10.2021): 2125. http://dx.doi.org/10.3390/plants10102125.

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Plant growth-promoting rhizobacteria (PGPR) is a microbial population found in the rhizosphere of plants that can stimulate plant development and restrict the growth of plant diseases directly or indirectly. In this study, 90 rhizospheric soil samples from five agro climatic zones of chilli (Capsicum annuum L.) were collected and rhizobacteria were isolated, screened and characterized at morphological, biochemical and molecular levels. In total, 38% of rhizobacteria exhibited the antagonistic capacity to suppress Ralstonia solanacearum growth and showed PGPR activities such as indole acetic acid production by 67.64% from total screened rhizobacteria isolates, phosphorus solubilization by 79.41%, ammonia by 67.75%, HCN by 58.82% and siderophore by 55.88%. We performed a principal component analysis depicting correlation and significance among plant growth-promoting activities, growth parameters of chilli and rhizobacterial strains. Plant inoculation studies indicated a significant increase in growth parameters and PDS1 strain showed maximum 71.11% biocontrol efficiency against wilt disease. The best five rhizobacterial isolates demonstrating both plant growth-promotion traits and biocontrol potential were characterized and identified as PDS1—Pseudomonas fluorescens (MN368159), BDS1—Bacillus subtilis (MN395039), UK4—Bacillus cereus (MT491099), UK2—Bacillus amyloliquefaciens (MT491100) and KA9—Bacillus subtilis (MT491101). These rhizobacteria have the potential natural elicitors to be used as biopesticides and biofertilizers to improve crop health while warding off soil-borne pathogens. The chilli cv. Pusa Jwala treated with Bacillus subtilis KA9 and Pseudomonas fluorescens PDS1 showed enhancement in the defensive enzymes PO, PPO, SOD and PAL activities in chilli leaf and root tissues, which collectively contributed to induced resistance in chilli plants against Ralstonia solanacearum. The induction of these defense enzymes was found higher in leave tissues (PO—4.87-fold, PP0—9.30-fold, SOD—9.49-fold and PAL—1.04-fold, respectively) in comparison to roots tissue at 48 h after pathogen inoculation. The findings support the view that plant growth-promoting rhizobacteria boost defense-related enzymes and limit pathogen growth in chilli plants, respectively, hence managing the chilli bacterial wilt.

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Glick, Bernard R. „The enhancement of plant growth by free-living bacteria“. Canadian Journal of Microbiology 41, Nr. 2 (01.02.1995): 109–17. http://dx.doi.org/10.1139/m95-015.

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The ways in which plant growth promoting rhizobacteria facilitate the growth of plants are considered and discussed. Both indirect and direct mechanisms of plant growth promotion are dealt with. The possibility of improving plant growth promoting rhizobacteria by specific genetic manipulation is critically examined.Key words: plant growth promoting rhizobacteria, PGPR, bacterial fertilizer, soil bacteria.

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Liu, Ying, Jie Gao, Zhihui Bai, Shanghua Wu, Xianglong Li, Na Wang, Xiongfeng Du et al. „Unraveling Mechanisms and Impact of Microbial Recruitment on Oilseed Rape (Brassica napus L.) and the Rhizosphere Mediated by Plant Growth-Promoting Rhizobacteria“. Microorganisms 9, Nr. 1 (12.01.2021): 161. http://dx.doi.org/10.3390/microorganisms9010161.

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Plant growth-promoting rhizobacteria (PGPR) are noticeably applied to enhance plant nutrient acquisition and improve plant growth and health. However, limited information is available on the compositional dynamics of rhizobacteria communities with PGPR inoculation. In this study, we investigated the effects of three PGPR strains, Stenotrophomonas rhizophila, Rhodobacter sphaeroides, and Bacillus amyloliquefaciens on the ecophysiological properties of Oilseed rape (Brassica napus L.), rhizosphere, and bulk soil; moreover, we assessed rhizobacterial community composition using high-throughput Illumina sequencing of 16S rRNA genes. Inoculation with S. rhizophila, R. sphaeroides, and B. amyloliquefaciens, significantly increased the plant total N (TN) (p < 0.01) content. R. sphaeroides and B. amyloliquefaciens selectively enhanced the growth of Pseudomonadacea and Flavobacteriaceae, whereas S. rhizophila could recruit diazotrophic rhizobacteria, members of Cyanobacteria and Actinobacteria, whose abundance was positively correlated with inoculation, and improved the transformation of organic nitrogen into inorganic nitrogen through the promotion of ammonification. Initial colonization by PGPR in the rhizosphere affected the rhizobacterial community composition throughout the plant life cycle. Network analysis indicated that PGPR had species-dependent effects on niche competition in the rhizosphere. These results provide a better understanding of PGPR-plant-rhizobacteria interactions, which is necessary to develop the application of PGPR.

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García de Salamone, Ines E., Russell K. Hynes und Louise M. Nelson. „Cytokinin production by plant growth promoting rhizobacteria and selected mutants“. Canadian Journal of Microbiology 47, Nr. 5 (01.05.2001): 404–11. http://dx.doi.org/10.1139/w01-029.

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One of the proposed mechanisms by which rhizobacteria enhance plant growth is through the production of plant growth regulators. Five plant growth promoting rhizobacterial (PGPR) strains produced the cytokinin dihydrozeatin riboside (DHZR) in pure culture. Cytokinin production by Pseudomonas fluorescens G2018, a rifampicin-resistant mutant (RIF), and two TnphoA-derived mutants (CNT1, CNT2), with reduced capacity to synthesize cytokinins, was further characterized in pure culture using immunoassay and thin layer chromatography. G2018 produced higher amounts of three cytokinins, isopentenyl adenosine (IPA), trans-zeatin ribose (ZR), and DHZR than the three mutants during stationary phase. IPA was the major metabolite produced, but the proportion of ZR and DHZR accumulated by CNT1 and CNT2 increased with time. No differences were observed between strain G2018 and the mutants in the amounts of indole acetic acid synthesized, nor were gibberellins detected in supernatants of any of the strains. Addition of 105 M adenine increased cytokinin production in 96- and 168-h cultures of strain G2018 by approximately 67%. G2018 and the mutants CNT1 and CNT2 may be useful for determination of the role of cytokinin production in plant growth promotion by PGPR.Key words: cytokinins, plant growth regulation, Pseudomonas fluorescens, rhizobacteria, plant growth promoting rhizobacteria (PGPR).

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Yanti, Yulmira, Trimurti Habazar, Zurai Resti und Dewi Suhalita. „PENAPISAN ISOLAT RIZOBAKTERI DARI PERAKARAN TANAMAN KEDELAI YANG SEHAT UNTUK PENGENDALIAN PENYAKIT PUSTUL BAKTERI (Xanthomonas axonopodis pv. glycines)“. Jurnal Hama dan Penyakit Tumbuhan Tropika 13, Nr. 1 (10.01.2013): 24–34. http://dx.doi.org/10.23960/j.hptt.11324-34.

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Screening of indigenous rhizobacteria from healthy soybean root to control bacterial pustule (Xanthomonas axonopodis pv. glycines) using in planta technique. Plant growth promoting rhizobacteria are a group of bacteria that actively colonize plant roots, increase plant growth and control plant pathogens. The aim of this study was to obtain rhizobacteri isolates which have the ability to control bacterial pustule and increase growth and yield of soybean. This method based on in planta selection of enhanced competitive soil root-colonizing bacteria from soil samples of healthy soybean root at endemic area of bacterial pustule in Darmasraya District and Sijunjung District, West Sumatera. We characterized only the best rhizobacteri isolates which have ability to control bacterial pustule and to increase growth and yield of soybean. This type of characterization has possibility to find new, easy and cheap biocontrol organisms. Ten Rhizobacteri isolates were introduced via seed treatment (108 cfu/ml) and soil drench to 3 week old soybean seedling. Xanthomonas axonopodis pv. glycines were inoculated to one month old of soybean seedling. The effect of rhizobacteria on disease incidence, disease severity, plant growth and yield of soybean were evaluated. We have found that two selected rhizobacteri isolates from soybean (P12Rz2.1 and P14Rz1.1) were the best isolates in promoting growth and the of the soybean plants with the effectiveness 20.62 % and 20.47 %.

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Lugtenberg, Ben, und Faina Kamilova. „Plant-Growth-Promoting Rhizobacteria“. Annual Review of Microbiology 63, Nr. 1 (Oktober 2009): 541–56. http://dx.doi.org/10.1146/annurev.micro.62.081307.162918.

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Miransari, Mohammad. „Plant Growth Promoting Rhizobacteria“. Journal of Plant Nutrition 37, Nr. 14 (30.08.2014): 2227–35. http://dx.doi.org/10.1080/01904167.2014.920384.

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Singh, Jay Shankar. „Plant Growth Promoting Rhizobacteria“. Resonance 18, Nr. 3 (März 2013): 275–81. http://dx.doi.org/10.1007/s12045-013-0038-y.

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Sharma, Vriti, Aakriti Singh, Diksha Sharma, Aashima Sharma, Sarika Phogat, Navjyoti Chakraborty, Sayan Chatterjee und Ram Singh Purty. „Stress mitigation strategies of plant growth-promoting rhizobacteria: Plant growth-promoting rhizobacteria mechanisms“. Plant Science Today 8, sp1 (12.02.2022): 25–32. http://dx.doi.org/10.14719/pst.1543.

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One of the major challenges that the world is facing currently is the inadequate amount of food production with high nutrient content in accordance with the increase in population size. Moreover, availability of cultivable area with fertile soil is reducing day by day owing to ever increasing population. Further, water scarcity and expensive agricultural equipment have led to the use of agrochemicals and untreated water. Excessive use of chemical fertilizers to increase crop yield have resulted in deleterious effects on the environment, health and economy, which can be overcome to a great extent by employing biological fertilizers. There are various microbes that grows in the rhizospheric region of plants known as plant growth-promoting rhizobacteria (PGPR). PGPR act by direct and indirect modes to stimulate plant growth and improve stress reduction in plants. PGPRs are used for potential agriculture practices having a wide range of benefits like increase in nutrients content, healthy growth of crops, production of phytohormones, prevention from heavy metal stress conditions and increase in crop yield. This review reports recent studies in crop improvement strategies using PGPR and describes the mechanisms involved. The potential mechanisms of PGPR and its allies pave the way for sustainable development towards agriculture and commercialization of potential bacteria.

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Saeed, Qudsia, Wang Xiukang, Fasih Ullah Haider, Jiří Kučerik, Muhammad Zahid Mumtaz, Jiri Holatko, Munaza Naseem et al. „Rhizosphere Bacteria in Plant Growth Promotion, Biocontrol, and Bioremediation of Contaminated Sites: A Comprehensive Review of Effects and Mechanisms“. International Journal of Molecular Sciences 22, Nr. 19 (29.09.2021): 10529. http://dx.doi.org/10.3390/ijms221910529.

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Agriculture in the 21st century is facing multiple challenges, such as those related to soil fertility, climatic fluctuations, environmental degradation, urbanization, and the increase in food demand for the increasing world population. In the meanwhile, the scientific community is facing key challenges in increasing crop production from the existing land base. In this regard, traditional farming has witnessed enhanced per acre crop yields due to irregular and injudicious use of agrochemicals, including pesticides and synthetic fertilizers, but at a substantial environmental cost. Another major concern in modern agriculture is that crop pests are developing pesticide resistance. Therefore, the future of sustainable crop production requires the use of alternative strategies that can enhance crop yields in an environmentally sound manner. The application of rhizobacteria, specifically, plant growth-promoting rhizobacteria (PGPR), as an alternative to chemical pesticides has gained much attention from the scientific community. These rhizobacteria harbor a number of mechanisms through which they promote plant growth, control plant pests, and induce resistance to various abiotic stresses. This review presents a comprehensive overview of the mechanisms of rhizobacteria involved in plant growth promotion, biocontrol of pests, and bioremediation of contaminated soils. It also focuses on the effects of PGPR inoculation on plant growth survival under environmental stress. Furthermore, the pros and cons of rhizobacterial application along with future directions for the sustainable use of rhizobacteria in agriculture are discussed in depth.

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SYAMSUDDIN, SYAMSUDDIN, MARLINA MARLINA, TJUT CHAMZURNI und VINA MAULIDIA. „Indigenous Rhizobacteria treatment in controlling diseases Phytophthora palmivora and increasing the viability and growth of cocoa seedling“. Jurnal Natural 21, Nr. 2 (24.06.2021): 105–13. http://dx.doi.org/10.24815/jn.v21i2.21216.

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Rhizobacteria play a positive role as biocontrol agents as well as Plant Growth Promoting Rhizobacteria (PGPR) agents. The research objective was to obtain indigenous rhizobacteria isolates on cocoa plants that have the potential to inhibit the attack of P. palmivora fungal pathogens, and act as PGPR in vitro and in vivo. The results of the study concluded that isolates TRI 7/1, TRI 8/8, GM 7/9 and GM 7/10 had the highest ability to inhibit the growth of pathogen. The lowest disease severity (20%) was obtained in the seedlings treated using isolates TRI 7/1 and TRI 8/8. Rhizobacterial isolates GM 3/6, GM 5/6, GM 7/9 and GM 8/8 produce high amounts of IAA. Rhizobacteria isolates GM 5/6, GM 7/9 and GM 8/8 has very high peroxidase enzyme activity. High production of HCN compounds was obtained in rhizobacteria isolates TRI 3/3, TRI 4/10 and TRI GM 8/11. All rhizobacterial isolates gave an increase in the value of maximum growth potential, germination and vigor values for growth strength compared with the control. The rizobacteria treatments using isolates TRI 7/1, TRI 8/8, GM 7/9 and GM 7/10 were able to increase plant height, stem diameter and number of leaves at 30, 40, 50, 60, and 70 DAP compared to control treatment.

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Khan, Naeem, Shahid Ali, Muhammad Adnan Shahid, Adnan Mustafa, R. Z. Sayyed und José Alfredo Curá. „Insights into the Interactions among Roots, Rhizosphere, and Rhizobacteria for Improving Plant Growth and Tolerance to Abiotic Stresses: A Review“. Cells 10, Nr. 6 (19.06.2021): 1551. http://dx.doi.org/10.3390/cells10061551.

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Abiotic stresses, such as drought, salinity, heavy metals, variations in temperature, and ultraviolet (UV) radiation, are antagonistic to plant growth and development, resulting in an overall decrease in plant yield. These stresses have direct effects on the rhizosphere, thus severely affect the root growth, and thereby affecting the overall plant growth, health, and productivity. However, the growth-promoting rhizobacteria that colonize the rhizosphere/endorhizosphere protect the roots from the adverse effects of abiotic stress and facilitate plant growth by various direct and indirect mechanisms. In the rhizosphere, plants are constantly interacting with thousands of these microorganisms, yet it is not very clear when and how these complex root, rhizosphere, and rhizobacteria interactions occur under abiotic stresses. Therefore, the present review attempts to focus on root–rhizosphere and rhizobacterial interactions under stresses, how roots respond to these interactions, and the role of rhizobacteria under these stresses. Further, the review focuses on the underlying mechanisms employed by rhizobacteria for improving root architecture and plant tolerance to abiotic stresses.

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Rizqi Jana, Nadia Aulia, Nurhayati Nurhayati und Syamsuddin Syamsuddin. „POTENSI BERBAGAI JENIS RIZOBAKTERI SEBAGAI PLANT GROWTH PROMOTING RHIZOBACTERIA (PGPR) DALAM MENINGKATKAN VIABILITAS DAN VIGOR BENIH KACANG TANAH“. Jurnal Ilmiah Mahasiswa Pertanian 8, Nr. 1 (21.02.2023): 37–43. http://dx.doi.org/10.17969/jimfp.v8i1.23622.

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Abstrak. Pemaanfaatan mikroorganisme rizobakteri atau dikenal sebagai plant growth promoting rhizobacteria (PGPR) untuk meningkatkan mutu benih melalui perlakuan benih yang diintegrasikan dengan mikroorganisme. Tujuan dari penelitian ini yaitu untuk mengetahui pengaruh penggunaan rizobakteri pemacu pertumbuhan tanaman pada perlakuan benih kacang tanah terhadap viabilitas dan vigornya. Penelitian ini dilaksanakan di Laboratorium Ilmu dan Teknologi Benih Program Studi Agroteknologi Fakultas Pertanian, Universitas Syiah Kuala, Darussalam Banda Aceh, mulai bulan januari hingga bulan maret 2022. Penelitian ini menggunakan Rancangan Acak Lengkap (RAL) non faktorial. Terdapat 27 satuan percobaan yang meliputi 8 taraf rizobakteri dan 1 kontrol dengan 3 ulangan. Jenis rizobakteri II NA 4, II NA 13 dan III KB 3 berbeda nyata terhadap penggunaan rizobakteri jenis II NA 1, II NA 14, II KB 5, III KB 1, dan III SPA 1, namun berbeda tidak nyata terhadap perlakuan kontrol pada parameter potensi tumbuh maksimum (PTM), daya berkecambah (DB) dan keserempakan tumbuh (KST), hal ini dikarena setiap jenis rizobakteri memiliki peranan yang berbeda-beda, walaupun rizokbakteri yang digunakan pada penelitian ini tidak terlalu berperan sebagai pemacu pertumbuhan tanaman, akan tetapi rizobakteri tersebut masih berpotensi untuk digunakan sebagai bioprotektan.Potential of Various Genus / Species of Rhizobacteria as PGPR in Increasing the Viability and Vigor of Arachis hypogea LAbstract. Utilization of rhizobacterial microorganisms or known as plant growth promoting rhizobacteria (PGPR) to improve seed quality through seed treatment that is integrated with microorganisms. This study aims to determine the effect of seed treatment using p1ant growth promoting rhizobacteria on the viabi1ity and vigor of peanut seeds. This research was conducted at the Seed Science and Technology Laboratory of the Agrotechno1ogy Study Program, Facu1ty of Agricu1ture, Syiah Kua1a University, Darussa1am Banda Aceh, from January to March 2022. This study used a comp1etely randomized design (CRD) with a non-factorial pattern. The factors studied were 8 levels of rhizobacteria and 1 control with 3 rep1ications so that there were 27 experimenta1 units. The types of rhizobacteria II NA 4, II NA 13 and III KB 3 were significantly different from the use of rhizobacteria types II NA 1, II NA 14, II KB 5, III KB 1, and III SPA 1, but not significantly different from the control treatment in terms of maximum growth potential (PTM), germination capacity (DB) and growth simultaneity (KST), this is because each type of rhizobacteria has a different role, even though the rhizobacteria used in this study were not very acts as a plant growth promoter, but these rhizobacteria still have the potential to be used as bioprotectants.

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Hassan, Mohammad, John McInroy und Joseph Kloepper. „The Interactions of Rhizodeposits with Plant Growth-Promoting Rhizobacteria in the Rhizosphere: A Review“. Agriculture 9, Nr. 7 (04.07.2019): 142. http://dx.doi.org/10.3390/agriculture9070142.

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Rhizodeposits, root exudates, and root border cells are vital components of the rhizosphere that significantly affect root colonization capacity and multiplication of rhizosphere microbes, as well as secretion of organic bioactive compounds. The rhizosphere is an ecological niche, in which beneficial bacteria compete with other microbiota for organic carbon compounds and interact with plants through root colonization activity to the soil. Some of these root-colonizing beneficial rhizobacteria also colonize endophytically and multiply inside plant roots. In the rhizosphere, these components contribute to complex physiological processes, including cell growth, cell differentiation, and suppression of plant pathogenic microbes. Understanding how rhizodeposits, root exudates, and root border cells interact in the rhizosphere in the presence of rhizobacterial populations is necessary to decipher their synergistic role for the improvement of plant health. This review highlights the diversity of plant growth-promoting rhizobacteria (PGPR) genera, their functions, and the interactions with rhizodeposits in the rhizosphere.

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Ikhwan, Ali, Aniek Iriany, Erny Ishartati, Shazma Anwar und Faridlotul Hasanah. „The Effect of Several Rhizobacteria Consortia Formulation and Bacterial Density to the Growth and Yield of Five Maize Cultivars in Indonesia“. E3S Web of Conferences 432 (2023): 00004. http://dx.doi.org/10.1051/e3sconf/202343200004.

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Maize is one of the important crop so production improvement is must be done to sufficient the needs. Plant growth promoting rhizobacteria has become a feasible, efficient and sustainable approach to increase maize productivity. This study investigated the effect of several rhizobacteria consortia formulations and bacterial density on the growth and yield of five maize cultivars in Indonesia. The experiment was carried out using a nested-split plot randomized complete block design (RCBD). The treatments consisted of two rhizobacteria consortia formulation (granule and liquid) as nested, four rhizobacterial density (0, 107, 108, and 109 cfu mL–1) as main plot, and five maize cultivars (Bisi 18, Bisi 2, Pertiwi 3, Bisi 228, and Bisi 220) as subplot. The growth and yield data were analyzed through ANOVA and by means using DMRT α 5 % to determine the best treatment. Application of rhizobacteria consortia formulation on five maize varieties did significantly affect the growth and yield of maize although bacterial density did not showed the same results. Rhizobacteria consortia with granule formulation appeared significantly higher yield performance than liquid. Pertiwi 3 tended to produce higher average yield than other varieties for both rhizobacteria consortia formulation although the varieties did not significantly contribute on ear weight variables.

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Adedayo, Afeez Adesina, Olubukola Oluranti Babalola, Claire Prigent-Combaret, Cristina Cruz, Marius Stefan, Funso Kutu und Bernard R. Glick. „The application of plant growth-promoting rhizobacteria in Solanum lycopersicum production in the agricultural system: a review“. PeerJ 10 (31.05.2022): e13405. http://dx.doi.org/10.7717/peerj.13405.

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Food safety is a significant challenge worldwide, from plantation to cultivation, especially for perishable products such as tomatoes. New eco-friendly strategies are needed, and beneficial microorganisms might be a sustainable solution. This study demonstrates bacteria activity in the tomato plant rhizosphere. Further, it investigates the rhizobacteria’s structure, function, and diversity in soil. Rhizobacteria that promote the growth and development of tomato plants are referred to as plant growth-promoting bacteria (PGPR). They form a series of associations with plants and other organisms in the soil through a mutualistic relationship where both parties benefit from living together. It implies the antagonistic activities of the rhizobacteria to deter pathogens from invading tomato plants through their roots. Some PGPR are regarded as biological control agents that hinder the development of spoilage organisms and can act as an alternative for agricultural chemicals that may be detrimental to the health of humans, animals, and some of the beneficial microbes in the rhizosphere soil. These bacteria also help tomato plants acquire essential nutrients like potassium (K), magnesium (Mg), phosphorus (P), and nitrogen (N). Some rhizobacteria may offer a solution to low tomato production and help tackle food insecurity and farming problems. In this review, an overview of soil-inhabiting rhizobacteria focused on improving the sustainable production of Solanum lycopersicum.

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Noel, T. C., C. Sheng, C. K. Yost, R. P. Pharis und M. F. Hynes. „Rhizobium leguminosarum as a plant growth-promoting rhizobacterium: direct growth promotion of canola and lettuce“. Canadian Journal of Microbiology 42, Nr. 3 (01.03.1996): 279–83. http://dx.doi.org/10.1139/m96-040.

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Early seedling root growth of the nonlegumes canola (Brassica campestris cv. Tobin, Brassica napus cv. Westar) and lettuce (Lactuca saliva cv. Grand Rapids) was significantly promoted by inoculation of seeds with certain strains of Rhizobium leguminosarum, including nitrogen- and nonnitrogen-fixing derivatives under gnotobiotic conditions. The growfh-promotive effect appears to be direct, with possible involvement of the plant growth regulators indole-3-acetic acid and cytokinin. Auxotrophic Rhizobium mutants requiring tryptophan or adenosine (precursors for indole-3-acetic acid and cytokinin synthesis, respectively) did not promote growth to the extent of the parent strain. The findings of this study demonstrate a new facet of the Rhizobium–plant relationship and that Rhizobium leguminosarum can be considered a plant growth-promoting rhizobacterium (PGPR).Key words: Rhizobium, plant growth-promoting rhizobacteria, PGPR, indole-3-acetic acid, cytokinin, roots, auxotrophic mutants.

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Sarathambal, C., K. Ilamurugu, L. Srimathi Priya und K. K. Barman. „A review on weeds as source of novel plant growth promoting microbes for crop improvement“. Journal of Applied and Natural Science 6, Nr. 2 (01.12.2014): 880–86. http://dx.doi.org/10.31018/jans.v6i2.549.

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In the context of increasing international concern for food security and environmental quality, the use of bioinoculants like diazotrophs and plant growth-promoting rhizobacteria (PGPR) for reducing chemical inputs in agriculture is a potentially important issue. The improvement in agricultural sustainability requires optimal use and management of soil fertility and soil physical properties, where both rely on soil biological processes and soil biodiversity. Biological nitrogen fixation by plant-associated bacteria is eco-friendly and has been effectively exploited for crop plants including legumes. Although associations of rhizobacteria with non-leguminous plants such as grasses have been known for decades, they have been poorly - studied. Weedy grass species normally thrive in adverse conditions and act as potential habitats for the diverse groups of elite bacteria with multiple beneficial characters remains unexplored. A more complete understanding of the diversity and functioning of rhizobacterial microorganisms, especially those that have symbiotic relationships with grass species is of great value for agricultural research and application.

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Mabood, Fazli, Xiaomin Zhou und Donald L. Smith. „Microbial signaling and plant growth promotion“. Canadian Journal of Plant Science 94, Nr. 6 (August 2014): 1051–63. http://dx.doi.org/10.4141/cjps2013-148.

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Mabood, F., Zhou, X. and Smith, D. L. 2014. Microbial signaling and plant growth promotion. Can. J. Plant Sci. 94: 1051–1063. The rhizosphere offers a complex microhabitat where root exudates provide a diverse mixture of organic compounds that are used as nutrients or signals by the soil microbial population. On the other hand, these soil microorganisms produce compounds that directly or indirectly assist in plant growth promotion. The widely recognized mechanisms of plant growth promotion are biofertilization, production of phytohormones, suppression of diseases through biocontrol, induction of disease resistance and production of volatile signal compounds. During the past few decades our understanding of the interaction between rhizobacteria and plants has expanded enormously and this has resulted in application of microbial products used as crop inoculants (as biofertilizers), for increased crop biomass and disease suppression. However, this plant–microbe interaction is affected by adverse environmental conditions, and recent work has suggested that inoculants carrying plant-to-bacteria or bacteria-to-plant signals can overcome this and promote plant productivity under stressful environmental conditions. Very recent work has also shown that some plant growth-promoting rhizobacteria secrete novel signaling molecules that also promote plant growth. The use of rhizobacterial signaling in promoting plant growth offers a new window of opportunity, especially when we are looking at plants to provide biofuels and novel bioproducts. Developing technologies that can enhance plant growth and productivity is imperative.

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Fatima, Kaneez. „Insights into Chemical Interaction between Plants and Microbes and its Potential Use in Soil Remediation“. BioScientific Review 01, Nr. 04 (Dezember 2019): 39–45. http://dx.doi.org/10.32350/bsr.0104.05.

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Soil bacteria are very vital and they are frequently used in production of crop. Chemical dialogues between bacteria and plant roots result in the proliferation and biofilm formation of plant growth promoting and contaminant degrading bacteria. Plant-bacterial interactions in the rhizosphere are the determinants of plant health and soil fertility. Plant growth promoting rhizobacteria (PGPR) which is also known as plant health promoting rhizobacteria (PHPR) or nodule promoting rhizobacteria (NPR). It can benefit the host plant directly by enhancing plant growth or indirectly by producing hydrolytic enzymes and by priming plant defence. This review elaborates the effect of plant and bacterial products on the remediation of contaminated soil.

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EL-MELEIGI, MOHAMED A. „EFFECT OF SOIL Pseudomonas ISOLATES APPLIED TO CORN, SORGHUM AND WHEAT SEEDS ON SEEDLING GROWTH AND CORN YIELD“. Canadian Journal of Plant Science 69, Nr. 1 (01.01.1989): 101–8. http://dx.doi.org/10.4141/cjps89-012.

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The purpose of this study was to determine the effect of several Pseudomonas isolates obtained from the rhizosphere of corn (Zea mays L.), sorghum (Sorghum bicolor Moench L.) and wheat (Triticum aestivum L.) on the seedling growth of these cereals and on stalk rot and grain yield of corn. Seeds of BoJac 56 and NC 5288 corn hybrids. Asgrow and Pioneer 8272 sorghum hybrids and Parker 76 and Scout wheat cultivars were coated with rhizobacteria (176 isolates) and germinated in nonautoclaved or autoclaved field soils in the greenhouse. The dry weights of cereals seedlings (3 wk old) were not significantly affected by bacterial treatments in the autoclaved soils regardless of plant species. Eight cereal Pseudomonas rhizobacteria increased seedling growth significantly in one or more of corn, sorghum or wheat cultivars in nonautoclaved soils in the greenhouse. The stand density, stalk and root rot incidence and grain yield of two corn hybrids were not improved by coating their seeds with growth-promoting rhizobacteria during 2 yr of field testing. Some isolates actually reduced the stand and grain yield of certain corn hybrids in the field. The effect of each rhizobacterium varied considerably between plant species and between cultivars within the same species. The growth-promoting rhizobacteria differed significantly in their ability to inhibit growth of 14 plant pathogenic bacteria and fungi on agar media.Key words: Biological control, antagonism, Pseudomonas, corn, sorghum, wheat, stalk rot

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Asha, Moonmoon Nahar, Atiqur Rahman, Quazi Forhad Quadir und Md Shahinur Islam. „Isolation and screening of multifunctional rhizobacteria from the selected sites of Madhupur, Narshingdi and Mymensingh, Bangladesh“. Research in Agriculture Livestock and Fisheries 2, Nr. 1 (27.04.2015): 1–8. http://dx.doi.org/10.3329/ralf.v2i1.23020.

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A laboratory experiment was performed to isolate some native rhizobacteria that could be used as bioinoculants for sustainable crop production. A total of 43 rhizobacteria were isolated from undisturbed plant rhizosphere soils of three different locations of Bangladesh and evaluated their plant growth promoting traits, both direct and indirect. The study has screened out isolates on the basis of their phosphorous solubilization and nitrogen (N) fixation. The phosphate solubilization assay in National Botanical Research Institute of Phosphate (NBRIP) medium revealed that 12 bacterial isolates were able to solubilize tricalcium phosphate and the rhizobacteria M25 showed best performance with a PSI of 3.33 at 5 day. Exactly 47% (20 isolates) of the isolated rhizobacteria were able to grow in N-free Winogradskys medium, which is an indication of potential N2-fixers. Among the 20 potential N-fixers, 15 were able to grow within 24 hours of incubation indicating that they are more efficient in Nfixation. The present study successfully isolated and characterized 43 rhizobacteria. Some of these isolated rhizobacteria have potential plant growth promoting traits and are potential plant growth promoting rhizobacteria (PGPR) candidate. Considering all plant growth promoting traits, the isolate F37 was the best followed by M6. However, further experiments are needed to determine the effectiveness of these isolates under in vitro and different field conditions to understand the nature of interaction with the plant and environment.Res. Agric., Livest. Fish.2(1): 1-8, April 2015

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Yanti, Yulmira. „YY SOCIALIZATION AND APPLICATION OF RHIZOBACTERIA IN GINGER CULTIVATION IN THE JORONG BELUBUS INNOVATION FARMING GROUP, NAGARI SUNGAI TALANG, GUGUAK DISTRICT, LIMAPULUH KOTA REGENCY“. LOGISTA - Jurnal Ilmiah Pengabdian kepada Masyarakat 5, Nr. 2 (30.12.2021): 336. http://dx.doi.org/10.25077/logista.5.2.336-344.2021.

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Nagari Sungai Talang is one of the villages in Payakumbuh District, Lima Puluh Kota Regency which seeks to cultivate ginger plants. The type of ginger commonly developed by this Innovation farmer group is elephant ginger. This ginger has a rhizome that is larger and fatter, the rhizome segment is more bulging than other varieties of ginger. This type of ginger can be consumed both when you are young and old, both as fresh ginger and processed ginger. One of the obstacles that hinder our farmers from developing organic ginger here is the low production because the supply of nutrients is also low and the attack of pests and diseases is quite high. Therefore, it is necessary to find a treatment that can overcome this problem to increase the production of organic ginger. One of the microorganisms that is widely reported to act as biological agents is from the Plant Growth Promoting Rhizobacteria (PGPR) group or plant growth promoting rhizobacteria. Rhizobacteria have the ability to aggressively colonize the rhizosphere and some types of rhizobacteria are capable of dual roles as biofertilizers and bioprotectants in plants. The purpose of this farmer group empowerment activity is to provide knowledge about the benefits of Rhizobacterial biological agents in triggering the growth and yield of ginger plants in the field as well as plant-disturbing organisms that often attack ginger plants during cultivation, as well as effective control methods through outreach activities and direct counseling in the field. The method used is the method of socialization, counseling and direct discussion with farmer groups. The results obtained from this empowerment activity are that the farmer groups understand the benefits of Rhizobacteria biological agents as a trigger for growth and production of ginger plants, know various plant pest organisms (OPT) and know how to properly control them.

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SYAMSUDDIN, SYAMSUDDIN, SITI HAFSAH, VINA MAULIDIA und AINUN MARLIAH. „The effect of plant growth promoting Rhizobacteria treatment on germination and seedlings growth of chilli“. Jurnal Natural 22, Nr. 2 (30.06.2022): 85–93. http://dx.doi.org/10.24815/jn.v22i2.24458.

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The aim of the research was to study the effects of biological seed treatment utilization rhizobacteria on seed germination and seedling growth, furthermore to figure out the competence of rhizobacteria isolates to dissolve phosphate, produce acetic indol acid (IAA) and siderophore. 18 rhizobacteria isolates used in this research, each isolates was anlayze in vitro; IAA, phosphate and siderophore. Then carried out the in vitro test, the pepper seeds were inoculated with rhizobacteria isolates suspension then germinated. Seedlings were transpalated into a plastic pot filled with medium soil and compost (2:1). The germination was observed everyday until 14 days, the seedlings was observed at 4 and 6 weeks after transplating. Based on the study, all the rhizobacteria isolates produced IAA, 13 rhizobacteria isolates capable to dissolve phosphate and 12 rhizobacteria isolates produced siderophore. Seed treatment using RBNA 14, RBNA 13, RBKB 5, and RBSPA 14 adequate to increase the germination in seed viability and vigor also increase seedling growth

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Yodphet, Butsakorn, Nisachon Jangpromma, Wanwipa Kaewpradit Polpinit und Nuntavun Riddech. „Interaction between Rhizobacteria and Andrographis paniculata Under Water Limitation“. Environment and Natural Resources Journal 22, Nr. 2 (14.02.2024): 1–13. http://dx.doi.org/10.32526/ennrj/22/20230310.

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Drought stress is a major agricultural problem that leads to increased accumulation of ethylene in plants. It also has negative effects on plant productivity and growth. Andrographis paniculate is an important herb widely used in medical applications to inhibit diseases caused by viruses. In order to improve the production quality and growth of the A. paniculata, ACC-deaminase plant growth-promoting rhizobacteria were isolated from rice rhizosphere soil. All bacterial isolates were screened for their plant growth-promoting properties, including ACC deaminase, IAA production, biofilm formation, and exopolysaccharide production. Among the bacterial isolates, Rh-01 and Rh-22 exhibited positive results (cutting-edge) in all tests and were identified as Paenibacillus polymyxa Rh-01 and Stenotrophomonas maltophilia Rh-22, respectively. These strains were selected for further pot experiment study. Our results revealed that treatment with chemical fertilizer showed the highest potential to promote A. paniculata seedlings under normal moisture conditions. However, under water limitation conditions, the application of ACC-deaminase plant growth-promoting rhizobacteria led to a higher chlorophyll content compared to the control treatment. In addition, under normal irrigation conditions, plant growth promoting rhizobacterial increased relative water content and total biomass. In terms of plant stress markers, the proline content in Andrographis paniculate’s seedling stage was low under water limitation conditions. In conclusion, to enhance the growth of A. paniculate seedlings during water limitation stress, a combination of microbial biofertilizers and chemical fertilizers is beneficial.

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Wang, Rui, Hai-Lin Wang, Rui-Ping Tang, Meng-Ying Sun, Tang-Min Chen, Xu-Chu Duan, Xiao-Feng Lu et al. „Pseudomonas putida Represses JA- and SA-Mediated Defense Pathways in Rice and Promotes an Alternative Defense Mechanism Possibly through ABA Signaling“. Plants 9, Nr. 12 (24.11.2020): 1641. http://dx.doi.org/10.3390/plants9121641.

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The signaling pathways induced by Pseudomonas putida in rice plants at the early plant–rhizobacteria interaction stages, with and without inoculation of Xanthomonas oryzae pv. oryzae, were studied. In the absence of pathogen, P. putida reduced ethylene (ET) production, and promoted root and stem elongation. Interestingly, gene OsHDA702, which plays an important role in root formation, was found significantly up-regulated in the presence of the rhizobacterium. Although X. oryzae pv. oryzae inoculation enhanced ET production in rice plants, P. putida treatment repressed ET-, jasmonic acid (JA)- and salicylic acid (SA)-mediated defense pathways, and induced the biosynthesis of abscisic acid (ABA), and the overexpression of OsHDA705 and some pathogenesis-related proteins (PRs), which in turn increased the susceptibility of the rice plants against the pathogen. Collectively, this is the first work on the defense signaling induced by plant growth-promoting rhizobacteria in plants at the early interaction stages, and suggests that rhizobacteria stimulate an alternative defense mechanism in plants based on ABA accumulation and OsHDA705 signaling.

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Adrianus, Adrianus, Yosehi Mekiuw, Abdul Rizal, Diana S. Susanti und La Ode Muh Munadi. „The Effectiveness of Local Rhizobacteria Formulations in Increasing The Growth and Production of Rice Plants in Merauke“. International Journal of Environmental Engineering and Development 1 (30.05.2023): 34–49. http://dx.doi.org/10.37394/232033.2023.1.5.

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This study aimed to examine the effectiveness of acetoin-producing rhizobacteria formula in promoting growth and increasing local rice yields in Merauke. This in vitro ponder was conducted at the Biopesticide Research facility, Staff of Horticulture, Udayana College. This think about was carried out within the test cultivate of the Staff of Agribusiness, Udayana College, Denpasar. This think about focused on four rhizobacteria segregates that have been recognized to be tried to fortify the development of rice plants. The rice assortment utilized was the Ciherang assortment, which was frequently developed by cultivating communities in Merauke Rule. The test plan utilized was a Randomized Piece Plan (RBD), comprising of 4 replications. Each replication comprised of 6 medications, to be specific 4 rhizobacteria separates and 2 medicines for comparison. The four rhizobacteria confines were Rg21, Pd13, Pd7, and Bb7. Whereas the 2 medicines as a comparison were Unadulterated Acetoin (Dad ) and control. Each treatment was rehashed 10 times so that the whole reiteration was 240 rice plant pots. The pot measure utilized was a surface with a distance across of 30 cm and was filled with developing media. The results of the study showed that the mechanism of action of the rhizobacterial formula in increasing rice yields was the presence of acetoin compounds and derivative compounds such as 2-Butanone, 3-hydroxy, 2,3-butanediol, diacetate, 2,3-Butanediol (CAS), 2-Butanone, 3-acetyloxy, and 1,4-Dioxane. These compounds were produced by rhizobacteria in the rhizosphere, which helped plants achieve acetoin homeostatic conditions so that plants could increase plant height, leaf area, number, number of productive tillers, panicle length, percentage of filled and empty grain, and reduce amylose content. The treatment of Merauke local rhizobacteria formula carried out in a greenhouse with a concentration of 2% was effective in promoting growth and increasing rice yields by adding the weight per plant by 52.83% when compared to the control.

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Yuliatin, Ervinda. „The Ecological Significance of Plant Growth Promoting Rhizobacteria in Tropical Soil Kalimantan: A Narrative Review“. Journal of Tropical Life Science 13, Nr. 2 (25.05.2023): 407–20. http://dx.doi.org/10.11594/jtls.13.02.20.

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The diversity of flora in Kalimantan influences the presence of microbe-associated with rhizosphere on their activities and functions in ecosystems. However, abiotic stress such as acidification, drought, and toxic soil residues negatively impacted soil health and plant growth in some regions of Kalimantan's soil. The rhizobacteria, as a group of the plant-growth-promoting rhizobacteria (PGPR), can colonize in the rhizosphere to produce their natural product in making phytohormone for root growth, maintaining soil aggregation and solubilizing the mineral in the soil. Those benefit of rhizobacteria is essential to investigate. However, the study of the role of rhizobacteria in Kalimantan soil interaction with the plant was unclear. Therefore, this review focused on the presence of rhizobacteria and their potency to solve abiotic problems in Kalimantan soil and the underlying mechanism rhizobacteria employs to tolerate harsh soil.

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Jeyanthi, V., und S. Kanimozhi. „Plant Growth Promoting Rhizobacteria (PGPR) - Prospective and Mechanisms: A Review“. Journal of Pure and Applied Microbiology 12, Nr. 2 (30.06.2018): 733–49. http://dx.doi.org/10.22207/jpam.12.2.34.

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Abdullahi, Salamatu, Yahuza Gimba Muhammed, Abdurrazak Muhammad, Jamila Mashi Ahmed und Dayyabu Shehu. „Isolation and Characterization of Bacillus Spp. for Plant Growth Promoting Properties“. Acta Biologica Marisiensis 5, Nr. 2 (01.12.2021): 47–58. http://dx.doi.org/10.2478/abmj-2022-0009.

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Abstract A group of free-living bacteria known as plant growth-promoting rhizobacteria (PGPR) inhabit the rhizosphere and aid root development. These rhizobacteria bacteria are vital to the growth of plants and can serve as bio-fertilizer and can enhance food security through green agricultural practices. They exhibit special features which make them potential candidates as bio-fertilizer. Isolation and characterization of rhizobacteria is the first step toward their utilization as bio-fertilizers. Ten rhizobacteria from two different rice farms were isolated and characterized for plant growth promoting properties. The isolated rhizobacteria were identified morphologically, microscopically, biochemically, and molecularly. Plant’s growth promoting properties of these rhizobacteria was also analyzed which includes; Indole 3-acetic acid production (IAA), phosphate solubilisation, hydrogen cyanide production (HCN), ammonia production (NH3), and zinc solubilisation. Out of the ten isolates, three were found to have the best plant growth enhancing properties and were therefore the best candidates as bio-fertilizers. 16SrRNA study and phylogenetic analysis was performed in order to unravel the specie of these three isolates and they were identified as Bacillus subtilis, Bacillus niacini, and Bacillus cereus with accession numbers OM184294, OM1842295 and OM184296 respectively. These isolates have the potential to be used as bio-fertilizer, which would significantly contribute to food security.

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Freitas, J. Renato de, und James J. Germida. „Plant growth promoting rhizobacteria for winter wheat“. Canadian Journal of Microbiology 36, Nr. 4 (01.04.1990): 265–72. http://dx.doi.org/10.1139/m90-046.

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The association of winter wheat (Triticum aestivum L. cv. Norstar) with root-colonizing bacteria (rhizobacteria) was studied in potted soil experiments in the growth chamber. Thirty-six known bacteria, some of which have been reported to stimulate plant growth, and 75 isolates obtained from the rhizosphere of winter wheat were tested for their effects on plant growth and development in two different soils. Two known bacteria and 12 isolates stimulated growth of winter wheat. Of these, the most effective were nine isolates that significantly (P < 0.01) increased plant height, root and shoot biomass, and number of tillers. The plant growth promoting effects of isolates were different in the two soils. Three of these strains were tentatively classified as Pseudomonas aeruginosa, and two each as Pseudomonas cepacia, Pseudomonas fluorescens, and Pseudomonas putida. Some isolates induced significant increases in seedling emergence rates and (or) demonstrated antagonism in vitro against Rhizoctonia solani and Leptosphaeria maculans. These results demonstrate the potential use of plant growth promoting rhizobacteria as inoculants for winter wheat. Key words: pseudomonads, plant growth promoting rhizobacteria, winter wheat, rhizosphere, bacterial inoculants.

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Nadeem, Sajid Mahmood, Zahir Ahmad Zahir, Muhammad Naveed und Muhammad Arshad. „Rhizobacteria containing ACC-deaminase confer salt tolerance in maize grown on salt-affected fields“. Canadian Journal of Microbiology 55, Nr. 11 (November 2009): 1302–9. http://dx.doi.org/10.1139/w09-092.

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Salt stress is one of the major constraints hampering agricultural production owing to its impact on ethylene production and nutritional imbalance. A check on the accelerated ethylene production in plants could be helpful in minimizing the negative effect of salt stress on plant growth and development. Four Pseudomonas , 1 Flavobacterium , and 1 Enterobacter strain of plant growth promoting rhizobacteria containing 1-aminocyclopropane-1-carboxylate (ACC)-deaminase were selected and their effects on growth and yield of maize were investigated to improve the salt tolerance of maize grown on salt-affected fields. The selected rhizobacterial isolates reduced or eliminated the classical “triple” response, indicating their ability to reduce stress-induced ethylene levels. Results showed that rhizobacterial strains, particularly Pseudomonas and Enterobacter spp., significantly promoted the growth and yield of maize compared with the non-inoculated control. Pseudomonas fluorescens increased plant height, biomass, cob yield, grain yield, 1000 grain mass, and straw yield of maize up to 29%, 127%, 67%, 60%, 17%, and 166%, respectively, over the control. Under stress conditions, more N, P, and K uptake and high K+–Na+ ratios were recorded in inoculated plants compared with the control. The results imply that inoculation with plant growth promoting rhizobacteria containing ACC-deaminase could be a useful approach for improving growth and yield of maize under salt-stressed conditions.

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Carreiras, João, Ana Cruz-Silva, Bruno Fonseca, Ricardo C. Carvalho, Jorge P. Cunha, João Proença Pereira, Catarina Paiva-Silva et al. „Improving Grapevine Heat Stress Resilience with Marine Plant Growth-Promoting Rhizobacteria Consortia“. Microorganisms 11, Nr. 4 (27.03.2023): 856. http://dx.doi.org/10.3390/microorganisms11040856.

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Amid climate change, heatwave events are expected to increase in frequency and severity. As a result, yield losses in viticulture due to heatwave stress have increased over the years. As one of the most important crops in the world, an eco-friendly stress mitigation strategy is greatly needed. The present work aims to evaluate the physiological fitness improvement by two marine plant growth-promoting rhizobacteria consortia in Vitis vinifera cv. Antão Vaz under heatwave conditions. To assess the potential biophysical and biochemical thermal stress feedback amelioration, photochemical traits, pigment and fatty acid profiles, and osmotic and oxidative stress biomarkers were analysed. Bioaugmented grapevines exposed to heatwave stress presented a significantly enhanced photoprotection capability and higher thermo-stability, exhibiting a significantly lower dissipation energy flux than the non-inoculated plants. Additionally, one of the rhizobacterial consortia tested improved light-harvesting capabilities by increasing reaction centre availability and preserving photosynthetic efficiency. Rhizobacteria inoculation expressed an osmoprotectant promotion, revealed by the lower osmolyte concentration while maintaining leaf turgidity. Improved antioxidant mechanisms and membrane stability resulted in lowered lipid peroxidation product formation when compared to non-inoculated plants. Although the consortia were found to differ significantly in their effectiveness, these findings demonstrate that bioaugmentation induced significant heatwave stress tolerance and mitigation. This study revealed the promising usage of marine PGPR consortia to promote plant fitness and minimize heatwave impacts in grapevines.

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Purnima und Pooja Singh. „Plant Growth Promoting- Rhizobacteria (PGPR): Their Potential as Biofertilizer and Biopesticide Agents: A Review“. Asian Journal of Advances in Agricultural Research 22, Nr. 1 (22.04.2023): 25–37. http://dx.doi.org/10.9734/ajaar/2023/v22i1431.

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Currently, world is dealing with the curse of pollution in agricultural fields due to rampant use of chemical fertilizers and pesticides. These agrochemicals cause great harm to human health when consumed in food (e.g. cancer and thyroid) and also to environment (reduce fertility of soil etc) when released out there. Hence, there is an intense demand of such biological agents (e.g. microorganisms) which could partially or fully replace these agrochemicals. Plant growth promoting rhizobacteria could come to the rescue and would help to escalate growth and productivity of plants in an environment friendly way. Plant growth promoting rhizobacteria occurs in/around plant roots; enhance its growth and development, directly or indirectly by depleting or secreting several regulative chemical compounds. The direct method by which plant growth promoting rhizobacteria escalates plant growth is, by making easy availability of phosphorus, nitrogen and other essential minerals as well as by controlling quantity of plant hormones whereas indirect methods include, reducing impeding effects of pathogenic microbes (e.g. by siderophore production) which adversely affect development and growth of plants. There are several studies which registers that plant growth promoting rhizobacteria escalates health and yield of several plant species, both in normal and adverse situations. Therefore, plant growth promoting rhizobacteria could possibly lower the reliability of world on harmful agricultural chemicals which disturbs ecosystem. They can be used as a potent biofertilizers and biopesticides whose market demand is also hiking globally, currently as reported here.

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Babalola, Olubukola, und Oluwaseun Adeyinka Fasusi. „The multifaceted plant-beneficial rhizobacteria toward agricultural sustainability“. Plant Protection Science 57, No. 2 (01.03.2021): 95–111. http://dx.doi.org/10.17221/130/2020-pps.

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Agricultural practices depend mainly on the use of chemical fertilisers, pesticides, and herbicides which have caused serious health hazards and have also contributed to the pollution of the environment at large. The application of plant-beneficial rhizobacteria in agrarian practices has become paramount in increasing soil fertility, promoting plant growth, ensuring food safety, and increasing crop production to ensure sustainable agriculture. Beneficial rhizobacteria are soil microorganisms that are eco-friendly and serve as a modern method of improving the plant yield, protecting the plant and soil fertility that pose no harm to humans and the environment. This eco-friendly approach requires the application of beneficial rhizobacteria with plant growth-promoting traits that can improve the nutrient uptake, enhance the resistance of plants to abiotic and biotic stress, protect plants against pathogenic microorganisms and promote plant growth and yield. This review article has highlighted the multitasking roles that beneficial rhizobacteria employ in promoting plant growth, food production, bioremediation, providing defence to plants, and maintaining soil fertility. The knowledge acquired from this review will help in understanding the bases and importance of plant-beneficial rhizobacteria in ensuring agricultural sustainability and as an alternative to the use of agrochemicals.

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Yadav, Sanjay Kumar, und Poonam Singh. „Isolation and Characterization of Plant Growth Promoting Rhizobacteria form Raphanus sativus (Radish)“. International Journal of Plant & Soil Science 35, Nr. 19 (29.08.2023): 923–28. http://dx.doi.org/10.9734/ijpss/2023/v35i193626.

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Rhizobacteria are present in rhizosphere region of plant root system, which enhance the plant growth by various way like biological nitrogen fixation, siderophore production, phosphate solubilization and phytohormone production. The soil samples were collected from rhizosphere region of Raphanus sativus, after enrichment rhizobacteria was isolated by serial dilution method, diluted sample were spread on respective solid agar media plates. Isolated rhizobacteria was identify by biochemical and molecular characterization methods. The isolated PGPRs was Bacillus subtilis which was showed phosphate solubilization activity and they were enhanced 30% more green gram seed germination. The method of current research is screening, isolation and biochemical characterization of rhizobacteria form rhizosphere region of Raphanus sativus. Phosphate solubilizing bacteria, solubilized the unavailable phosphate and provide to plant. The main purpose of this research paper is to widen the understanding of the role of phosphate solubilizing bacteria in crop production as biofertilizers.

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Nadeem, Sajid Mahmood, Zahir Ahmad Zahir, Muhammad Naveed und Muhammad Arshad. „Preliminary investigations on inducing salt tolerance in maize through inoculation with rhizobacteria containing ACC deaminase activity“. Canadian Journal of Microbiology 53, Nr. 10 (Oktober 2007): 1141–49. http://dx.doi.org/10.1139/w07-081.

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Twenty rhizobacterial strains containing 1-aminocyclopropane-1-carboxylate deaminase were isolated from the rhizosphere of salt-affected maize fields. They were screened for their growth-promoting activities under axenic conditions at 1, 4, 8, and 12 dS·m–1salinity levels. Based upon the data of the axenic study, the 6 most effective strains were selected to conduct pot trials in the wire house. Besides one original salinity level (1.6 dS·m–1), 3 other salinity levels (4, 8, and 12 dS·m–1) were maintained in pots and maize seeds inoculated with selected strains of plant growth-promoting rhizobacteria, as well as uninoculated controls were sown. Results showed that the increase in salinity level decreased the growth of maize seedlings. However, inoculation with rhizobacterial strains reduced this depression effect and improved the growth and yield at all the salinity levels tested. Selected strains significantly increased plant height, root length, total biomass, cob mass, and grain yield up to 82%, 93%, 51%, 40%, and 50%, respectively, over respective uninoculated controls at the electrical conductivity of 12 dS·m–1. Among various plant growth-promoting rhizobacterial strains, S5 ( Pseudomonas syringae ), S14 ( Enterobacter aerogenes ), and S20 ( Pseudomonas fluorescens ) were the most effective strains for promoting the growth and yield of maize, even at high salt stress. The relatively better salt tolerance of inoculated plants was associated with a high K+/Na+ratio as well as high relative water and chlorophyll and low proline contents.

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Dorjey, Stanzin, Disket Dolkar und Richa Sharma. „Plant Growth Promoting Rhizobacteria Pseudomonas: A Review“. International Journal of Current Microbiology and Applied Sciences 6, Nr. 7 (10.07.2017): 1335–44. http://dx.doi.org/10.20546/ijcmas.2017.607.160.

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Poonam Pandurang, Kshipra. „Plant Growth Promoting Rhizobacteria (PGPR) : A Review“. International Journal of Current Microbiology and Applied Sciences 10, Nr. 4 (10.04.2021): 882–86. http://dx.doi.org/10.20546/ijcmas.2021.1004.093.

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Seido, S. L., L. P. Sousa, M. J. Silva, V. P. Donzeli und S. O. P. Queiroz. „Melon growth-promoting rhizobacteria under saline stress“. Revista Brasileira de Ciências Agrárias - Brazilian Journal of Agricultural Sciences 14, Nr. 1 (30.03.2019): 1–9. http://dx.doi.org/10.5039/agraria.v14i1a5623.

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Jarak, M., T. H. Jafari, S. Djurić, J. G. Varga, J. Cervenski, M. Vasić und J. Colo. „PLANT GROWTH-PROMOTING RHIZOBACTERIA IN BEAN PRODUCTION“. Acta Horticulturae, Nr. 960 (September 2012): 409–15. http://dx.doi.org/10.17660/actahortic.2012.960.58.

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Kloepper, J. W. „Plant Growth-Promoting Rhizobacteria on Canola (Rapeseed)“. Plant Disease 72, Nr. 1 (1988): 42. http://dx.doi.org/10.1094/pd-72-0042.

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Parray, Javid A., Sumira Jan, Azra N. Kamili, Raies A. Qadri, Dilfuza Egamberdieva und Parvaiz Ahmad. „Current Perspectives on Plant Growth-Promoting Rhizobacteria“. Journal of Plant Growth Regulation 35, Nr. 3 (01.03.2016): 877–902. http://dx.doi.org/10.1007/s00344-016-9583-4.

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Díaz, Katy, Carolina Valiente, Miguel Martínez, Miguel Castillo und Eugenio Sanfuentes. „Root-promoting rhizobacteria in Eucalyptus globulus cuttings“. World Journal of Microbiology and Biotechnology 25, Nr. 5 (29.01.2009): 867–73. http://dx.doi.org/10.1007/s11274-009-9961-1.

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van Loon, L. C. „Plant responses to plant growth-promoting rhizobacteria“. European Journal of Plant Pathology 119, Nr. 3 (05.06.2007): 243–54. http://dx.doi.org/10.1007/s10658-007-9165-1.

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Hlongwane, Mokgadi M., Mustapha Mohammed, Ntebogeng S. Mokgalaka und Felix D. Dakora. „The Potential of Rhizobacteria to Mitigate Abiotic Stress in Lessertia frutescens“. Plants 12, Nr. 1 (03.01.2023): 196. http://dx.doi.org/10.3390/plants12010196.

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Lessertia frutescens is a multipurpose medicinal plant indigenous to South Africa. The curative ability of the medicinal plant is attributed to its rich phytochemical composition, including amino acids, triterpenoids, and flavonoids. A literature review of some of the phytochemical compounds, particularly amino acids, in L. frutescens shows a steady decrease in concentration over the years. The reduction of the phytochemical compounds and diminishing biological activities may be attributed to drought and salt stress, which South Africa has been grappling with over the years. Canavanine, a phytochemical which is associated with the anticancer activity of L. frutescens, reduced slightly when the plant was subjected to salt stress. Like other legumes, L. frutescens forms a symbiotic relationship with plant-growth-promoting rhizobacteria, which facilitate plant growth and development. Studies employing commercial plant-growth-promoting rhizobacteria to enhance growth and biological activities in L. frutescens have been successfully carried out. Furthermore, alleviation of drought and salt stress in medicinal plants through inoculation with plant growth-promoting-rhizobacteria is well documented and effective. Therefore, this review seeks to highlight the potential of plant-growth-promoting rhizobacteria to alleviate the effect of salt and drought in Lessertia frutescens.

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Mafia, Reginaldo Gonçalves, Acelino Couto Alfenas, Eraclides Maria Ferreira, Daniel Henrique Breda Binoti, Gizella Machado Ventura Mafia und Ann Honor Mounteer. „Root colonization and interaction among growth promoting rhizobacteria isolates and eucalypts species“. Revista Árvore 33, Nr. 1 (Februar 2009): 1–9. http://dx.doi.org/10.1590/s0100-67622009000100001.

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This work aimed to evaluate root colonization and interaction among isolates of rhizobacteria and eucalypt species. The method used to evaluate "in vitro" root colonization was able to indicate if the effect was benefic or deleterious allowing to pre-select isolates as potential growth promoter. There was interaction among isolates of rhizobacteria and Eucalyptus species for seed germinating and seedling growth. MF2 (Pseudomonas sp.) was the best rhizobacteria isolate for growth promotion of E. cloeziana e E. grandis. S1 (Bacillus subtilis) was the most effective for E. globulus, and Ca (Pseudomonas fulva), MF2 (Pseudomonas sp.), CIIb (Stenotrophomonas maltophilia) and S2 (B. subtilis) were the most promising isolates for the E. urophylla.

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Charina, А. V., V. G. Skripov, I. G. Budzanivska, М. V. Kovalchuk und V. P. Polischuk. „THE INFLUENCE OF RHIZOBACTERIA ON THE INFECTION OF СUCUMIS SATIVUS CAUSED BY CUCUMBER GREEN MOTTLE MOSAIC VIRUS“. Agriciltural microbiology 5 (16.04.2007): 179–86. http://dx.doi.org/10.35868/1997-3004.5.179-186.

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Some strains of rhizobacteria were investigated for biocontrol efficiency against cucumber green mottle virus (CGMV) in cucumber. Treatment of seeds with three strains of rhizobacteria caused delay in symptom appearance, reduced development of CGMV significantly and enhanced plant growth. Hence, plant growth promoting rhizobacteria could play a major role in reducing of plant virus infections and increasing crop yields.

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Zhao, Yi, Yingqi Hong, Peng Wang, Yirong Gou, Rensen Zeng, Qianrong Zhang, Dongmei Chen und Yuanyuan Song. „Assembly of Tomato Rhizobacteria from Different Functional Groups Improves Seedling Photosynthesis and Growth“. Plants 12, Nr. 23 (28.11.2023): 4000. http://dx.doi.org/10.3390/plants12234000.

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The rhizosphere harbors abundant plant growth-promoting rhizobacteria (PGPR) that are vital for plant health. In this study, we screened growth-promoting bacteria from tomato rhizosphere soil, verified their functions, and constructed the optimal combination of growth-promoting bacteria for promoting tomato growth. Furthermore, the effects of these bacteria on various physiological and biochemical parameters of tomato plants were evaluated. A total of 36 strains of rhizobacteria were isolated from tomato rhizosphere soil and their abilities to produce indole-3-acetic acid (IAA), solubilize phosphate and iron carriers were assessed. The bacterial strains with the highest capacities for IAA production (R62, R317), phosphate solubilization (R41, R219), and siderophore production (R25, R325) were selected to form three bacterial combinations: R62 + R219 + R317 + R325 (T1), R62 + R325 (T5), and R317 + R325 (T8). Fifteen days after inoculation, all three combinations showed a stimulatory effect on seedling growth compared to the un-inoculated control. Inoculation with T1, T5 and T8 increased the seedling vigor index by 173.7%, 204.1%, and 168.7%, respectively. Compared to the un-inoculated control, the T1 combination increased the activities of polyphenol oxidase, peroxidase, and the net photosynthetic rate by 132.7%, 18.7%, 58.5%, and upregulated the relative expression levels of the photosynthetic assimilation-related genes RbcL, RbcS, FBPase and FDA by 22.2-, 6.6-, 1.95-, and 2.0-fold, respectively. Our findings provide a potential for constructing rhizobacterial combinations of different functional groups for improving crop growth.

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Asghar, H. N., Z. A. Zahir und M. Arshad. „Screening rhizobacteria for improving the growth, yield, and oil content of canola (Brassica napus L.)“. Australian Journal of Agricultural Research 55, Nr. 2 (2004): 187. http://dx.doi.org/10.1071/ar03112.

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One hundred rhizobacteria previously isolated from the rhizospheres of Brassica species were screened for their growth promoting activity in Brassica napus L. under gnotobiotic conditions. Results revealed that 58% of the rhizobacteria increased root length (up to 139%), 39% enhanced shoot length (up to 78%), and shoot weight (up to 72%) of Brassica napus L. Based upon growth promotion of B. napus seedlings under gnotobiotic conditions, 10 promising plant-growth-promoting rhizobacteria (PGPR) were selected and tested for their effectiveness in growth promotion, yield, and oil content of B. napus grown in pots. The pot trials revealed that inoculation with selected PGPR increased plant height, root length, number of branches per plant, stem diameter, number of pods per plant, 1000-grain weight, grain yield, and oil content over a range of 7–57% above the uninoculated control. These isolates were then assayed for their ability to produce auxins in vitro in the presence and absence of L-tryptophan. Regression analysis showed that in vitro auxin production by these bacteria was significantly related to the number of branches and oil content of B. napus. It is highly likely that improvement in growth and yield of the inoculated plants is due to an increase in the number of branches per plant, since there was a positive correlation of this growth parameter with the number of pods per plant, 1000-grain weight, grain yield, and seed oil content. Results indicated that simultaneous screening of rhizobacteria for growth promotion under gnotobiotic conditions and in vitro production of auxins could be a useful approach for selecting effective PGPR.

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