Academic literature on the topic 'PROMOTING BACTERIA (PGPB)'
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Journal articles on the topic "PROMOTING BACTERIA (PGPB)"
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Ngalimat, Mohamad Syazwan, Erneeza Mohd Hata, Dzarifah Zulperi, Siti Izera Ismail, Mohd Razi Ismail, Nur Ain Izzati Mohd Zainudin, Noor Baity Saidi, and Mohd Termizi Yusof. "Plant Growth-Promoting Bacteria as an Emerging Tool to Manage Bacterial Rice Pathogens." Microorganisms 9, no. 4 (March 26, 2021): 682. http://dx.doi.org/10.3390/microorganisms9040682.
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As a major food crop, rice (Oryza sativa) is produced and consumed by nearly 90% of the population in Asia with less than 9% produced outside Asia. Hence, reports on large scale grain losses were alarming and resulted in a heightened awareness on the importance of rice plants’ health and increased interest against phytopathogens in rice. To serve this interest, this review will provide a summary on bacterial rice pathogens, which can potentially be controlled by plant growth-promoting bacteria (PGPB). Additionally, this review highlights PGPB-mediated functional traits, including biocontrol of bacterial rice pathogens and enhancement of rice plant’s growth. Currently, a plethora of recent studies address the use of PGPB to combat bacterial rice pathogens in an attempt to replace existing methods of chemical fertilizers and pesticides that often lead to environmental pollutions. As a tool to combat bacterial rice pathogens, PGPB presented itself as a promising alternative in improving rice plants’ health and simultaneously controlling bacterial rice pathogens in vitro and in the field/greenhouse studies. PGPB, such as Bacillus, Pseudomonas, Enterobacter, Streptomyces, are now very well-known. Applications of PGPB as bioformulations are found to be effective in improving rice productivity and provide an eco-friendly alternative to agroecosystems.
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Mokrani, Slimane, El-hafid Nabti, and Cristina Cruz. "Current Advances in Plant Growth Promoting Bacteria Alleviating Salt Stress for Sustainable Agriculture." Applied Sciences 10, no. 20 (October 10, 2020): 7025. http://dx.doi.org/10.3390/app10207025.
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Humanity in the modern world is confronted with diverse problems at several levels. The environmental concern is probably the most important as it threatens different ecosystems, food, and farming as well as humans, animals, and plants. More specifically, salinization of agricultural soils is a global concern because of on one side, the permanent increase of the areas affected, and on the other side, the disastrous damage caused to various plants affecting hugely crop productivity and yields. Currently, great attention is directed towards the use of Plant Growth Promoting Bacteria (PGPB). This alternative method, which is healthy, safe, and ecological, seems to be very promising in terms of simultaneous salinity alleviation and improving crop productivity. This review attempts to deal with different aspects of the current advances concerning the use of PGPBs for saline stress alleviation. The objective is to explain, discuss, and present the current progress in this area of research. We firstly discuss the implication of PGPB on soil desalinization. We present the impacts of salinity on crops. We look for the different salinity origin and its impacts on plants. We discuss the impacts of salinity on soil. Then, we review various recent progress of hemophilic PGPB for sustainable agriculture. We categorize the mechanisms of PGPB toward salinity tolerance. We discuss the use of PGPB inoculants under salinity that can reduce chemical fertilization. Finally, we present some possible directions for future investigation. It seems that PGPBs use for saline stress alleviation gain more importance, investigations, and applications. Regarding the complexity of the mechanisms implicated in this domain, various aspects remain to be elucidated.
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Ajijah, Nur, Angelika Fiodor, Alok Kumar Pandey, Anuj Rana, and Kumar Pranaw. "Plant Growth-Promoting Bacteria (PGPB) with Biofilm-Forming Ability: A Multifaceted Agent for Sustainable Agriculture." Diversity 15, no. 1 (January 13, 2023): 112. http://dx.doi.org/10.3390/d15010112.
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Plant growth-promoting bacteria (PGPB) enhance plant growth, as well as protect plants from several biotic and abiotic stresses through a variety of mechanisms. Therefore, the exploitation of PGPB in agriculture is feasible as it offers sustainable and eco-friendly approaches to maintaining soil health while increasing crop productivity. The vital key of PGPB application in agriculture is its effectiveness in colonizing plant roots and the phyllosphere, and in developing a protective umbrella through the formation of microcolonies and biofilms. Biofilms offer several benefits to PGPB, such as enhancing resistance to adverse environmental conditions, protecting against pathogens, improving the acquisition of nutrients released in the plant environment, and facilitating beneficial bacteria–plant interactions. Therefore, bacterial biofilms can successfully compete with other microorganisms found on plant surfaces. In addition, plant-associated PGPB biofilms are capable of protecting colonization sites, cycling nutrients, enhancing pathogen defenses, and increasing tolerance to abiotic stresses, thereby increasing agricultural productivity and crop yields. This review highlights the role of biofilms in bacterial colonization of plant surfaces and the strategies used by biofilm-forming PGPB. Moreover, the factors influencing PGPB biofilm formation at plant root and shoot interfaces are critically discussed. This will pave the role of PGPB biofilms in developing bacterial formulations and addressing the challenges related to their efficacy and competence in agriculture for sustainability.
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Xu, Jinzhi, Lijun Qin, Xinyi Xu, Hong Shen, and Xingyong Yang. "Bacillus paralicheniformis RP01 Enhances the Expression of Growth-Related Genes in Cotton and Promotes Plant Growth by Altering Microbiota inside and outside the Root." International Journal of Molecular Sciences 24, no. 8 (April 13, 2023): 7227. http://dx.doi.org/10.3390/ijms24087227.
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Plant growth-promoting bacteria (PGPB) can promote plant growth in various ways, allowing PGPB to replace chemical fertilizers to avoid environmental pollution. PGPB is also used for bioremediation and in plant pathogen control. The isolation and evaluation of PGPB are essential not only for practical applications, but also for basic research. Currently, the known PGPB strains are limited, and their functions are not fully understood. Therefore, the growth-promoting mechanism needs to be further explored and improved. The Bacillus paralicheniformis RP01 strain with beneficial growth-promoting activity was screened from the root surface of Brassica chinensis using a phosphate-solubilizing medium. RP01 inoculation significantly increased plant root length and brassinosteroid content and upregulated the expression of growth-related genes. Simultaneously, it increased the number of beneficial bacteria that promoted plant growth and reduced the number of detrimental bacteria. The genome annotation findings also revealed that RP01 possesses a variety of growth-promoting mechanisms and a tremendous growth-promoting potential. This study isolated a highly potential PGPB and elucidated its possible direct and indirect growth-promoting mechanisms. Our study results will help enrich the PGPB library and provide a reference for plant–microbe interactions.
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Saberi Riseh, Roohallah, Marzieh Ebrahimi-Zarandi, Mozhgan Gholizadeh Vazvani, and Yury A. Skorik. "Reducing Drought Stress in Plants by Encapsulating Plant Growth-Promoting Bacteria with Polysaccharides." International Journal of Molecular Sciences 22, no. 23 (November 30, 2021): 12979. http://dx.doi.org/10.3390/ijms222312979.
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Drought is a major abiotic stress imposed by climate change that affects crop production and soil microbial functions. Plants respond to water deficits at the morphological, biochemical, and physiological levels, and invoke different adaptation mechanisms to tolerate drought stress. Plant growth-promoting bacteria (PGPB) can help to alleviate drought stress in plants through various strategies, including phytohormone production, the solubilization of mineral nutrients, and the production of 1-aminocyclopropane-1-carboxylate deaminase and osmolytes. However, PGPB populations and functions are influenced by adverse soil factors, such as drought. Therefore, maintaining the viability and stability of PGPB applied to arid soils requires that the PGPB have to be protected by suitable coatings. The encapsulation of PGPB is one of the newest and most efficient techniques for protecting beneficial bacteria against unfavorable soil conditions. Coatings made from polysaccharides, such as sodium alginate, chitosan, starch, cellulose, and their derivatives, can absorb and retain substantial amounts of water in the interstitial sites of their structures, thereby promoting bacterial survival and better plant growth.
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Bergna, Alessandro, Tomislav Cernava, Manuela Rändler, Rita Grosch, Christin Zachow, and Gabriele Berg. "Tomato Seeds Preferably Transmit Plant Beneficial Endophytes." Phytobiomes Journal 2, no. 4 (January 2018): 183–93. http://dx.doi.org/10.1094/pbiomes-06-18-0029-r.
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Endophytes with plant growth-promoting activity can improve the health and development of plants during all life stages. However, less is known about their stability and transmission across plant genotypes, habitats, and generations. By combining community and isolate analyses, we found that each plant habitat and genotype harbored distinct bacterial communities and plant growth-promoting bacteria (PGPB). Soil, root endosphere, and rhizosphere were the habitats with the highest bacterial diversity, while seeds hosted more selective communities. Seeds generated under field conditions showed traces of a bacterial community composition connected to the suppression of plant pathogens. In contrast, seeds of the successive generation grown in a pathogen-free and low-nutrient environment showed a predominance of bacteria that facilitate the uptake of nutrients. These modifications of the microbiome can be explained by an adaptation to prevalent environmental conditions. Cultivation approaches revealed microhabitat-specific PGPB that were assigned to various species of Bacillus, Stenotrophomonas, and Ralstonia. Tracking down these bacteria among the whole tomato plant allowed us to identify the seed as a primary vehicle of PGPB transmission. This previously undescribed vertical transmission of PGPB represents a strategy to maintain plant beneficial bacteria over generations and has an impact for the design of seed treatments.
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do Amaral, Fernanda Plucani, Thalita Regina Tuleski, Vania Carla Silva Pankievicz, Ryan A. Melnyk, Adam P. Arkin, Joel Griffitts, Michelle Zibetti Tadra-Sfeir, et al. "Diverse Bacterial Genes Modulate Plant Root Association by Beneficial Bacteria." mBio 11, no. 6 (December 15, 2020): e03078-20. http://dx.doi.org/10.1128/mbio.03078-20.
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ABSTRACTThe plant rhizosphere harbors a diverse population of microorganisms, including beneficial plant growth-promoting bacteria (PGPB), that colonize plant roots and enhance growth and productivity. In order to specifically define bacterial traits that contribute to this beneficial interaction, we used high-throughput transposon mutagenesis sequencing (TnSeq) in two model root-bacterium systems associated with Setaria viridis: Azoarcus olearius DQS4T and Herbaspirillum seropedicae SmR1. This approach identified ∼100 significant genes for each bacterium that appeared to confer a competitive advantage for root colonization. Most of the genes identified specifically in A. olearius encoded metabolism functions, whereas genes identified in H. seropedicae were motility related, suggesting that each strain requires unique functions for competitive root colonization. Genes were experimentally validated by site-directed mutagenesis, followed by inoculation of the mutated bacteria onto S. viridis roots individually, as well as in competition with the wild-type strain. The results identify key bacterial functions involved in iron uptake, polyhydroxybutyrate metabolism, and regulation of aromatic metabolism as important for root colonization. The hope is that by improving our understanding of the molecular mechanisms used by PGPB to colonize plants, we can increase the adoption of these bacteria in agriculture to improve the sustainability of modern cropping systems.IMPORTANCE There is growing interest in the use of associative, plant growth-promoting bacteria (PGPB) as biofertilizers to serve as a sustainable alternative for agriculture application. While a variety of mechanisms have been proposed to explain bacterial plant growth promotion, the molecular details of this process remain unclear. The current research supports the idea that PGPB use in agriculture will be promoted by gaining more knowledge as to how these bacteria colonize plants, promote growth, and do so consistently. Specifically, the research seeks to identify those bacterial genes involved in the ability of two, PGPB strains, Azoarcus olearius and Herbaspirillum seropedicae, to colonize the roots of the C4 model grass Setaria viridis. Applying a transposon mutagenesis (TnSeq) approach, we assigned phenotypes and function to genes that affect bacterial competitiveness during root colonization. The results suggest that each bacterial strain requires unique functions for root colonization but also suggests that a few, critical functions are needed by both bacteria, pointing to some common mechanisms. The hope is that such information can be exploited to improve the use and performance of PGPB in agriculture.
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Ambrosini, Adriana, and Luciane M. P. Passaglia. "Plant Growth–Promoting Bacteria (PGPB): Isolation and Screening of PGP Activities." Current Protocols in Plant Biology 2, no. 3 (September 2017): 190–209. http://dx.doi.org/10.1002/pb.20054.
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Shilev, Stefan. "Plant-Growth-Promoting Bacteria Mitigating Soil Salinity Stress in Plants." Applied Sciences 10, no. 20 (October 19, 2020): 7326. http://dx.doi.org/10.3390/app10207326.
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Soil deterioration has led to problems with the nutrition of the world’s population. As one of the most serious stressors, soil salinization has a negative effect on the quantity and quality of agricultural production, drawing attention to the need for environmentally friendly technologies to overcome the adverse effects. The use of plant-growth-promoting bacteria (PGPB) can be a key factor in reducing salinity stress in plants as they are already introduced in practice. Plants having halotolerant PGPB in their root surroundings improve in diverse morphological, physiological, and biochemical aspects due to their multiple plant-growth-promoting traits. These beneficial effects are related to the excretion of bacterial phytohormones and modulation of their expression, improvement of the availability of soil nutrients, and the release of organic compounds that modify plant rhizosphere and function as signaling molecules, thus contributing to the plant’s salinity tolerance. This review aims to elucidate mechanisms by which PGPB are able to increase plant tolerance under soil salinity.
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Ikeda, Angela Cristina, Daiani Cristina Savi, Mariangela Hungria, Vanessa Kava, Chirlei Glienke, and Lygia Vitória Galli-Terasawa. "Bioprospecting of elite plant growth-promoting bacteria for the maize crop." Acta Scientiarum. Agronomy 42 (May 27, 2020): e44364. http://dx.doi.org/10.4025/actasciagron.v42i1.44364.
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The use of plant growth-promoting bacteria (PGPB), which aims to replace chemical fertilizers and biological control, is a goal for achieving agriculture sustainability. In this scenario, our goal was to identify and evaluate the potential of bacteria isolated from maize roots to promote plant growth and be used as inoculants. We evaluated 173 bacterial strains isolated from the maize (Zea mays L.) rhizosphere for the properties of their PGPB in vitro. Twelve strains were positive for siderophores, indole acetic acid (IAA) production, biological nitrogen fixation (BNF), and phosphate solubilization. Sequence analysis of 16S rRNA identified these strains as belonging to the genera Cellulosimicrobium, Stenotrophomonas, Enterobacter, and Bacillus. The elite strains were evaluated under greenhouse conditions upon the inoculation of two maize hybrids, ATL100 and KWX628. The ability of the isolates to promote plant growth was dependent on the maize genotype; Enterobacter sp. LGMB208 showed the best ability to promote growth of hybrid ATL100, while Enterobacter sp. strains LGMB125, LGMB225, and LGMB274 and Cellulosimicrobium sp. strain LGMB239 showed the best ability to promote growth of hybrid KWX628. The results highlight the potential of bacterial genera little explored as maize PGPB but indicate the need to investigate their interactions with different plant genotypes.
Dissertations / Theses on the topic "PROMOTING BACTERIA (PGPB)"
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SINGH, SHATRUPA. "AUGMENTATIVE ROLE OF PLANT GROWTH PROMOTING BACTERIA (PGPB) IN MODULATING RESPONSES AGAINST MITIGATION OF SALT STRESS IN TRIGONELLA FOENUM-GRAECUM." Thesis, DELHI TECHNOLOGICAL UNIVERSITY, 2021. http://dspace.dtu.ac.in:8080/jspui/handle/repository/18463.
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An experiment was conducted to evaluate the role of plant growth promoting bacteria (PGPB)
in mitigating salinity stress in Trigonella foenum graecum. Plants were subjected to three
different levels of salinity viz 0, 70 and 150 mM NaCl (electrical conductivity value 0.01, 7.67
and 15.50 mS cm-1
, respectively) using a completely randomized design experiment. PGPB
showed positive effects in mitigation of salinity stress in fenugreek plants and elevated various
growth responses viz. shoot and root length, shoot and root dry weight, leaf area and number
of leaves as compared to uninoculated plants. Microbial inoculation significantly enhanced the
physiological responses viz. photosynthetic rate, stomatal conductance, transpiration and
internal CO2 as compared to uninoculated plants. Biochemical aspects like carotenoids,
chlorophylls, nitrogen and protein content were also increased in the microbial inoculated
plants as compared to uninoculated plants. PGPB was very effective than in mitigating salinity
stress in fenugreek plant. The findings of this study revealed that PGPB inoculation can help
the plants to overcome the deleterious effects of salinity stress in fenugreek plants.
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Ribeiro, Manuella Nóbrega Dourado. "Burkholderia sp. cadmium tolerance mechanism and its influence in phytoremediation." Universidade de São Paulo, 2013. http://www.teses.usp.br/teses/disponiveis/11/11151/tde-17122013-144639/.
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Soils have been contaminated with cadmium (Cd) by the use of fertilizers, calcareous, pesticides and industrial and/or domestic effluents. It can be leached to groundwater, as well as be taken up by plants potentially leading to reduce growth and yield. It causes different damages to the cell, generating oxidative stress which is responsible for its toxicity, affecting all living organism. A balance in the redox state of the cell to maintain cellular integrity and metabolism is essential for organism tolerance. Thus, the antioxidant response of bacteria exposed to Cd was studied to understand the tolerance mechanism, and be able to develop a methodology to bioremediate contaminated soils. MDA and hydrogen peroxide contents and different enzymes activity of antioxidant system (SOD, CAT, GR and GST) of two strains from Burkholderia genus, one from a soil contaminated with Cd in high concentrations (strain SCMS54) and the other from soil without Cd (strain SNMS32) in two exposure time (5 and 12 h), were analyzed. Stress measurement (MDA and hydrogen peroxide content) and antioxidant enzyme activities (SOD, CAT, GR and GST) increased in almost all treatments in the presence of Cd. These results also indicate that strain SCMS54 (isolated from Cd contaminated soil) presents a higher metabolic diversity and plasticity due the expression of more isoforms of the enzymes SOD, CAT and GR. The strain also accumulates 50% more Cd. We also analyzed the response to Ni of these two strain, observing a similar response to Cd, except for GST enzyme expression, which in strain SCMS54 this enzyme was induced in the presence of Ni, indicating that this enzyme can be essential on Ni tolerance. After that, the strain isolated from Cd contaminated soil (SCMS54) was selected to proceed the studies to evaluate the benefits of tolerant microorganism-tomato plant interaction. The use of plants to remove heavy metals from contaminated soilhas less impact and a lower cost. Soil microorganisms can be able to solubilize or mobilize soil metals acting also as bioremediator. Besides the high tolerance to Cd, the strain SCMS54 can produce indole-acetic acid (IAA), solubilize inorganic phosphate and produce siderophore, revealing its potential in plantmicroorganism mutual and beneficial interaction. When interacting with tomato plants exposed to Cd, this bacterium led to decrease in plant peroxide concentration and chlorosis levels, promoted relative plant growth and reduced the root absorption of Cd resulting in an increase in plant tolerance to this highly toxic heavy metal. Indicating that inoculation of tomato plants with Burkholderia sp. SCMS54 promotes better growth when cultivated in the presence of Cd by a mechanism that appears to decrease Cd concentration in roots as a result of a bacterial-plant root beneficial interaction.O cádmio (Cd) tem contaminado solos pelo uso de fertilizantes, calcário, agrotóxicos e resíduos industriais e/ou domésticos. Podendo ser lixiviado ao lençol freático ou absorvido pelas plantas,resultando na redução do crescimento e da produtividade. Esse metal afeta todos os organismos vivos e causa diferentes danos às células. A tolerância a esse metal se deve principalmente ao balanço do estado redox da célula para manter a integridade celular e metabolismo.Assim, foram isoladas bactérias de solo contaminado e não contaminado com Cd, selecionando isolados tolerantes a altas concentrações de diferentes metais (Cd, Ni e Zn), em seguida, foi observado a resposta do sistema antioxidante da bactéria na presença do Cd, a fim de auxiliar no desenvolvimento de metodologias para biorremediar solos contaminados. Foi quantificado MDA e peróxido de hidrogênio e a atividade de diferentes enzimas do sistema antioxidante (SOD, CAT, GR e GST) de duas estirpes do gênero Burkholderia tolerantes a todos os metais testados, uma isolada do solo contaminado com altas concentrações de Cd (estirpe SCMS54) e a outra do solo sem Cd (estirpe SNMS32) em dois tempos de exposição (5 e 12 h). Na estirpe SCMS54, as medidas de estresse (peroxidação lipídica e peróxido de hidrogênio) e a atividade das enzimas antioxidantes (SOD, CAT, GR e GST) da maioria dos tratamento com cádmio aumentaram, esta estirpe também expressa mais isoformas de SOD, CAT e GR, além de acumular 50% mais Cd. Esses resultados mostram que a estirpe SCMS54 (isolada do solo contaminado com Cd) apresenta uma maior diversidade metabólica e plasticidade. Foram analisadas também a resposta dessas duas estirpes ao Ni, observando uma resposta semelhante ao Cd, exceto na expressão da enzima GST, que no estirpe SCMS54 foi induzida na presença do Ni, indicando que essa enzima pode ser essencial na tolerância ao Ni. Portanto, a estirpe isoladado solo contaminado com Cd (SCMS54) foi selecionada para prosseguir os estudos e avaliar os benefícios da interação entre microrganismos tolerantes-plantas de tomate na fitorremediação. Essa técnica é usada remover para metais pesados do solo com um menor impacto e baixos custos. Os microrganismos do solo podem solubilizar e mobilizar metais do solo, atuando como biorremediador. Além da alta tolerância ao Cd, a estirpe SCMS54 produz ácido indol acético (AIA), solubiliza fosfato inorgânico e produz sideroforo, mostrando seu potencial na interação benéfica planta-microorganismo. Quando interagindo com as plantas de tomate expostas ao Cd, essa bactéria diminui a concentração de peróxido da planta e a clorose ocasionado pelo Cd,e reduz a absorção de Cd pela raiz resultando em um aumento da tolerância da planta ao metal pesado altamente tóxico. Assim, a inoculação de plantas de tomate com Burkholderia sp. SCMS54 promove crescimento da planta na presença de Cd, desencadeando um mecanismo que diminui a concentração de Cd nas raízes devido a essa interação benéfica bactéria-raiz da planta.
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South, Kaylee. "Improving abiotic and biotic stress tolerance in floriculture crops." The Ohio State University, 2020. http://rave.ohiolink.edu/etdc/view?acc_num=osu1595499762154056.
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Kuntz, Veronica L. "The relationship between Sarracenia oreophila and an endophytic Burkholderia." Thesis, Georgia Institute of Technology, 2011. http://hdl.handle.net/1853/41094.
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Plant growth-promoting bacteria (PGPB) have been studied in many agriculturally interesting plants, but never in pitcher plants.
Sarracenia oreophila (the green pitcher plant) is an endangered species in Georgia, Alabama, and North Carolina (Rice 2010). With the help of Dr. Jim Spain's lab, a previous student in Dr. Gerald Pullman's lab discovered evidence that nitrogen-fixing bacteria (Burkholderia spp.) live within these pitcher plants. This study aims to determine whether these nitrogen-fixing bacteria confer a benefit to their host plants by providing fixed nitrogen.
To do this, pitcher plants were inoculated with the Burkholderia and grown on a control medium, a medium without sugar (as the sugar causes the bacteria to grow until they hinder the plants), various media that are missing nitrogen-containing compounds usually provided in growth media, and a medium completely lacking nitrogen. These plants were compared to control plants on the same media that had not been inoculated with Burkholderia. The plants' biomass and root growth were measured.
The data suggest that Burkholderia may stimulate plant biomass growth when sufficient nitrogen is present and there may be a nitrogen-threshold that needs to be met in order to sustain the Burkholderia-Sarracenia symbiosis. Also, the Burkholderia has a negative effect on roots grown in high-nitrogen media, possibly due to competition for nutrients.
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Maher, Mary. "Effects of Plant Growth-Promoting Bacteria and Fungi on Strawberry Plant Health, Fruit Yield, and Disease Susceptibility." DigitalCommons@CalPoly, 2021. https://digitalcommons.calpoly.edu/theses/2335.
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Studies on plant growth-promoting rhizobacteria (PGPR) and fungi (PGPF) as biostimulants have shown significant positive effects on plant health, fruit yield, or pest management. However, very few published studies to date have been specific regarding their effects on strawberries (Fragaria × ananassa), particularly on soilborne disease prevalence in organically grown strawberries. Empirical data on the results of using these products in commercial growing applications under various conditions would be highly valuable, especially for organic growers who have limited synthetic chemical pesticides, herbicides and fertilizers registered for use. The objective of this study is to evaluate the efficacy of biostimulant supplementation on strawberries for improving fruit yield, fruit quality, and plant health in both high-tunnel, open-sided ‘hoophouse’ and field conditions.
This study consisted of two research projects. The first project investigated the effects of commercially available PGPR-based biostimulant products on strawberry plant health. The three products contained differing proprietary combinations of PGPR, primarily from the Bacillus and Lactobacillus genera. Plants were grown in two different soil types: sandy and clay, in order to investigate the effects of biostimulant supplementation in different soil conditions. In fall of 2018, 160 ‘Monterey’ strawberry plants were grown in an outdoor hoophouse in 3-gallon pots. Plants were either treated monthly with a single bacterial biostimulant product (EM-1, Accomplish LM, or Armory), or left untreated as a control. Plants were grouped into 20 blocks, each block comprised of 8 plants (each of the four treatments replicated in both soil types). Fruit yield (g), fruit sugar content (Brix), and leaf SPAD absorbance levels were measured weekly from January 27 to June 26, 2019. The treatments tested had no significant effects on fruit yield, leaf SPAD absorbance or Brix; soil type, however, did significantly impact fruit yield, with higher yields in sandy soil.
The second project was a field trial beginning in spring of 2020, in collaboration with Rutiz Farms in Arroyo Grande, CA, involving a total of 480 ‘Chandler’ strawberry plants. The farm is organically managed and has a history of soilborne diseases, including Verticillium dahliae. These plants were either treated monthly with one of three microbial biostimulant products: a product containing a proprietary strain of Trichoderma harzianum biocontrol fungus (TrichoSym), and two of the same PGPR-based products used the previous year (Accomplish LM and Armory); or left untreated as a control. The experiment was laid out in a randomized complete block design with four blocks, with each block consisting of 4 plots for each of the 4 treatments; each plot contained 30 plants. Fruit yield (g) per plot was measured weekly throughout the 2020 growing season and phenotypic disease incidence was measured biweekly. Soil samples were taken at three different points throughout the season, cultured on selective media, and analyzed to obtain estimates of V. dahliae colony-forming units (CFU) per gram soil. The treatments tested had no significant effect on fruit yield, phenotypic disease incidence, or V. dahliae CFU/g soil. The results are inconclusive as to whether this lack of effect is due to viability of the products themselves, ineffective application techniques resulting in lack of rhizosphere colonization, or some combination of these. Further research is needed to determine whether or not supplementation with microbial biostimulants can produce reliable, beneficial results in strawberries.
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Thompson, Biosha. "Isolation and characterization of bacterial endophytes for growth promotion of Phaseolus vulgaris under salinity stress." University of the Western Cape, 2020. http://hdl.handle.net/11394/8078.
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>Magister Scientiae - MScAs the global human population grows, so does the demand for faster food production rates. Owing to this, agricultural practices have had to expand and move into semi-arid and arid regions, too, where frequent irrigation is essential. However, irrigated ground water contains many salt ions (mainly Na+ and Cl-) which contribute to soil salinization on croplands. Soil salinity negatively impacts crop growth and yield and thus, strategies for the alleviation of salt stress on crop plants have had to be developed. This study assessed the use of plant growth promoting bacteria (PGPB). The aim of this study was to isolate, identify and characterize bacterial endophytes isolated from the halophyte, Arctotheca calendula. Endophytes were identified using 16S rDNA and were screened for plant growth promoting properties including nitrogen fixation, phosphate and zinc solubilization, siderophore, ammonia and indole-3-acetic acid (IAA) when exposed to 0 mM, 300 mM and 600 mM NaCl. The endophytes had been identified as Erwinia persicina NBRC 102418T, Bacillus marisflavi JCM 11544T, Ochrobactrum rhizosphaerae PR17T, Microbacterium gubbeenense DSM 15944T and Bacillus zhangzhouensis DW5-4T and all of which had demonstrated some plant growth promoting characteristics. Thereafter, we aimed to demonstrate plant growth promotion of P. vulgaris cv. Star 2000 inoculated with PGPB under salinity stress. P. vulgaris cv. Star 2000 seeds were inoculated with the PGPB and exposed to 0 mM and 100 mM NaCl. Post-harvest, plants were assessed for their dry mass, cell death, superoxide concentration and nutrient content. It was discovered that salinity negatively impacted P. vulgaris cv. Star 2000’s dry mass, NaCl-induced cell death, and differentially influenced superoxide concentration, nutrient uptake and content of the leaf and root material in the inoculated and control treatments. However, the isolated PGPB had been able to mitigate the negative effects of soil salinity on P. vulgaris cv. Star 2000.
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Tchuisseu, Tchakounte Gylaine Vanissa. "Assessing the role of native plant growth-promoting rhizobacteria (PGPR) isolated from Cameroon soil as bio-inoculant in improving plant growth." Doctoral thesis, Humboldt-Universität zu Berlin, 2021. http://dx.doi.org/10.18452/22323.
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Der Mangel an Nährstoffen im Boden, hauptsächlich an Phosphor (P) und Stickstoff (N), verbunden mit einem hohen Salzgehalt und der generellen Verarmung landwirtschaftlicher Böden , sind ein ernstes Problem für die landwirtschaftliche Produktion weltweit. Daher besteht ein dringender Bedarf an Forschung und Entwicklung geeigneter landwirtschaftlicher Praktiken, um ungünstige Bodenbedingungen zu verringern und wenn möglich die Fruchtbarkeit von Kulturland wiederherzustellen. Die Verwendung von Rhizobakterien, die das Pflanzenwachstum (PGPR) fördern, kann sich bei der Entwicklung von Strategien zur Erleichterung des Pflanzenwachstums unter normalen Wachstumsbedingungen sowie unter abiotischen Stress als nützlich erweisen. Diese Bakterien bieten ihren pflanzlichen Wirten Vorteile, indem sie die Aufnahme von Bodenmineralien fördern und Pflanzen vor schädlichen Umwelteinflüssen schützen. Die vorliegende Arbeit bewertet die Rolle von in Kamerun natürlich vorkommenden PGPR an Mais und untersucht deren Potenzial als Bioimpfstoffe zur Steigerung des Pflanzenwachstums in Kamerun. Wir prüfen die Hypothese, dass einheimische Bakteriengemeinschaften aus Kamerun einen hohen Anteil an Bakterien aufweisen, deren Eigenschaften Kulturpflanzen helfen, mit ungünstigen Bedingungen umzugehen. In der vorliegenden Arbeit wurden dazu Bakteriengemeinschaften der Rhizosphäre von in Kamerun angebautem Mais isoliert und untersucht. Zum ersten Mal erfolgte eine umfassende phylogenetische Zuordnung aller kultivierbaren Bakterien, auf Grundlage ihrer potenziellen Fähigkeiten zur Förderung des Pflanzenwachstums.Nutrient deficiencies in soil, mainly in phosphorus (P) and nitrogen (N), coupled to salinity and the impoverishment of agricultural soils, are a severe problem for agricultural production worldwide. Therefore, there is an urgent need for research and development of more suitable agricultural practices in order to reduce unfavorable conditions, and if possible, to restore the fertility of cultivated lands. The use of rhizobacteria, which promote plant growth (PGPR), can prove useful in developing strategies to facilitate plant growth under normal as well as under abiotic stress conditions. These bacteria offer benefits to plant hosts by promoting the uptake of soil minerals and protecting plants from environmental stresses. The thesis evaluates the role of native PGPR associated with maize as potential bio-inoculants for plants growth in Cameroon. We hypothesized that native bacterial communities from Cameroon include a high potential of bacteria helping the plant cope with unfavorable conditions. Here, we provide for the first time a comprehensive phylogenetic affiliation of cultivable bacterial communities associated with maize rhizosphere grown in Cameroon in relationship to their potential plant growth-promoting abilities.
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Budiharjo, Anto. "Plant-bacteria interactions." Doctoral thesis, Humboldt-Universität zu Berlin, Mathematisch-Naturwissenschaftliche Fakultät I, 2011. http://dx.doi.org/10.18452/16333.
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Bacillus amyloliquenaciense FZB42 ist ein bekanntes Pflanzenwachstum-stimulierendes Rhizobakterium. Es produziert neben einer Vielzahl an Sekundärmetaboliten mit antibakterieller und antifungaler Wirkung, auch das Pflanzenhormon IAA. Obwohl viele dieser Mechanismen diskutiert werden, ist wenig darüber bekannt, auf welche Weise die Bakterien das Pflanzenwachstum fördern. In dieser Arbeit wurde eine Transposonmutagenese mithilfe des ‘mariner-transposons’ durchgeführt, und so eine Transposonbibliothek erstellt. Diese wurde dann auf geeignete Phänotypen untersucht, um die Gene zu finden, welche bestimmte Phänotypen verursachen. So konnten drei Mutanten erzeugt werden, die auf Grund der gestörten Biofilmbildung und der Fähigkeit zu schwärmen die Pflanzenwurzeln nicht mehr kolonialisieren konnten. Eine solche degU-Mutante, welche in der Biofilmbildung und ‚Swarming’ defizitär war und zwei Mutanten (yusV und pabB), die eine Beeinträchtigung in der Biofilmbildung aufwiesen, konnten durch Komplementation und Retransformation bestätigt werden. Mithilfe des Lemna-Biosystems und anderer Analysen mit A. thaliana konnten drei Gene bei B. amyloliqufaciens FZB42 gefunden werden, die wichtig für die Förderung des Pflanzenwachstums sind. Koloniesierungsexperimente der Wurzeln von A. thaliana mit diesen Mutanten zeigten deutlich verändertes Wachstum, verglichen mit dem Wildtypstamm. Ein weiteres Ziel dieser Arbeit war es neue Antibiotika in Mutanten, die in ihren nicht-ribosomalen Synthesen blockiert sind, zu finden. So konnten durch die Untersuchungen der Transposonbibliothek der Mutanten zwei neue Antibiotika entdeckt werden. Genauere Analysen dieser Antibiotika bestätigten, dass es sich um ein neues Bacteriocin (Amylocyclicin A) und ein neues Thiazol/Oxazole-modifiziertes Microcin (Plantazolicin) handelt. Die abschließenden Arbeiten beschäftigten sich dann mit Untersuchungen von Genen, welche für die Produktion von Substanzen gegen Nematoden verantwortlich sind. Hierbei konnten vier Mutanten gefunden werden, die durch eine Transposoninsertion eine schlechtere.Bacillus amyloliqufaciens FZB42 has been known as PGPR which has an impressive effect to improve plant growth. It produces not only vast array of secondary metabolites with antibacterial and antifungal activities, but also produces the plant hormone IAA. Although many mechanisms have been elucidated, our knowledge about basic molecular mechanisms responsible for its beneficial action is far from complete. In this study, transposon mutagenesis based on mariner tranposon was applied to generate tranposon library which then was screened to identify the genes involved in plant growth-promoting activity. Three mutants that were impaired in their ability to colonize plant surface due to defects in biofilm formation and swarming motility were found. One mutant (degU mutant) showed defect in biofilm formation and swarming motility, as well, two mutants (yusV mutant and pabB mutant) impaired in biofilm formation were confirmed by complementation and retransformation. Screening by the Lemna biosystem and further assays with A. thaliana revealed three genes responsible for reduction in plant growth promoting activity of B. amyloliqufaciens FZB42. Colonization studies of these mutants in A. thaliana roots revealed patterns different to the wild type. A further issue pursued in this study was to discover new antibiotics using a mutant which has been blocked in its nonribosomally pathway. Screening of tranposon librabries from this mutant led to the finding of two novel ribosomally synthesized antibiotics. Further characterization revealed that these new antibiotics belonged to a novel bacteriocin (Amylocyclicin A) and a novel thiazole/oxazole-modified microcin (Plantazolicin). Last work in this study was looking for genes responsible for nematocidal production. Four mutants which showed reduction in nematocidal activity due to transposon insertion were found.
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Bresson, Justine. "Interaction plante-microorganismes : Implication de la rhizobactérie Phyllobacterium brassicacearum dans les réponses d’Arabidopsis thaliana au stress hydrique." Thesis, Montpellier 2, 2013. http://www.theses.fr/2013MON20084/document.
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Les bactéries promotrices de la croissance des plantes (PGPR) peuvent améliorer la performance et la tolérance des plantes lors de stress environnementaux. Arabidopsis thaliana est un modèle de choix pour étudier les mécanismes impliqués dans les interactions plante-bactéries. Nous avons analysé de multiples traits associés à la dynamique de croissance, au développement et la physiologie des végétaux afin d'évaluer les effets de l'inoculation par Phyllobacterium brassicacearum STM196, une PGPR isolée de la rhizosphère du colza, sur les réponses d'A. thaliana à des stress hydriques de différentes intensités. Grâce à des outils performants de phénotypage, nous avons développé une nouvelle approche d'analyse à haut-débit pour examiner l'implication de STM196 dans les stratégies de résistance des plantes au stress hydrique. Nos résultats montrent pour la première fois que les PGPR peuvent interférer dans les stratégies d'échappement des plantes grâce à des modifications de la croissance et du temps de floraison. De plus, STM196 induit une meilleure résistance au déficit hydrique modéré et une meilleure tolérance à la déshydratation sous une contrainte hydrique sévère. L'inoculation par STM196 peut ainsi représenter une valeur ajoutée aux stratégies de résistance intrinsèques aux plantes, ce qui est illustrée par sa remarquable capacité à promouvoir la survie et la production de biomasse végétale dans des environnements contrastés. Nos résultats soulignent l'importance des interactions plantes-bactéries dans les réponses des plantes à la sécheresse et offrent de nouvelles voies de recherches pour l'amélioration de la résistance à la sécheresse dans les culturesPlant growth promoting rhizobacteria (PGPR) can enhance plant performance and plant tolerance to environmental stresses. Arabidopsis thaliana is a useful organism to study the mechanisms involved in plant-PGPR interactions. We analyzed multiple plant traits related to growth dynamics, development and physiology in order to assess the effects of Phyllobacterium brassicacearum STM196 strain, isolated from the rhizosphere of oilseed rape, on Arabidopsis responses to well-defined soil water availability. Using powerful tools for phenotyping, we developed a new high-throughput analysis to examine the implication of STM196 on plant strategies to cope with water stress. Our results show for the first time that PGPR can interfere in escape strategies of plants through modifications in plant growth and flowering time. Moreover, STM196 induced a better resistance to moderate water deficit and a better tolerance to dehydration under a severe stress. Inoculation by STM196 can represent an added value to plant resistance strategies, as illustrated by its remarkable ability to promote plant survival and biomass production under contrasted environments. Our results highlight the importance of plant-bacteria interactions in plant responses to drought and provide a new avenue of investigations to improve drought resistance in crops
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Soares, Bruno Miguel Ribeiro. "Effect of halophilic bacteria from Aveiro salt pans in the attenuation of saline stress in plants." Master's thesis, 2018. http://hdl.handle.net/10773/25368.
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Soil salinization is a globally growing problem, and several approaches have been proposed to mitigate its effects on the productivity of plants of economic interest. The use of halophilic or halotolerant bacteria as plant growth promoters is one of the strategies recommended for the mitigation of salt stress. However, halotolerant bacteria isolated from the rhizosphere of halophyte plants are the most commonly used inoculum. The objective of this work was to evaluate the potential of halophilic bacteria, isolated from a salt pan, in the attenuation of saline stress Lactuca sativa, used as a model crop glycophyte. A collection of strains isolated from Santiago da Fonte saltpans (Aveiro) representing the genera Bacillus, Halobacillus, Idiomarina and Marinobacter, was analyzed for some characteristics considered as advantageous in the colonization and promotion of growth of host plants. The production of extracellular enzymes in presence of 0, 20 and 100 NaCl, as well as the ability to solubilize phosphate and produce 1-aminocyclopropane-1-carboxylate deaminase were tested. H. locisalis and I. seosinesis, considered as more interesting in terms of plant growth promoting traits, were tested separately and together as inoculum in lettuce seeds. A factorial experimental design was applied to test the effect of inoculation and salinity of the irrigation water on the efficiency of seed germination and plant growth. Germination efficiency was strongly affected by salinity and no significant effects of inoculation were observed. The germination efficiency was lower at 10 NaCl than at salinity 0 and the weight of the plants was significantly lower in the plants inoculated with the consortium of isolates than in the uninoculated plants. Plants inoculated with the consortium and grown at salinity 10 had lower water content. When used separately, H. locisalis or I. seosinesis caused an increase in leaf size in plants cultivated in salinity, in relation to the inoculated control. Inoculation did not cause a significant effect on chlorophyll fluorescence. Although no evidence of attenuation of saline stress by inoculation was detected, H. locisalis inoculum showed a positive effect on the growth of plants in non-saline conditions, indicating a potential as a growth promoting bacterium of plants of agricultural interest.A salinização dos solos é um problema crescente a nível global e têm sido várias as abordagens propostas para atenuar os seus efeitos na produtividade de plantas de interesse económico. O uso de bactérias halófilas ou halotolerantes como promotoras do crescimento de plantas, é uma das estratégias preconizadas para a mitigação do stresse salino. No entanto, são normalmente usadas como inóculo bactérias halotolerantes isoladas da rizosfera de plantas halófitas. O objetivo deste trabalho foi avaliar o potencial de bactérias halófilas, isoladas de uma marinha de sal, na atenuação do stresse salino em Lactuca sativa, usada como modelo de glicófita de interesse agrícola. Uma coleção de estirpes isoladas da marinha de Santiago da Fonte (Aveiro) representando os géneros Bacillus, Halobacillus, Idiomarina e Marinobacter, foi analisada quanto a algumas caraterísticas consideradas como vantajosas na colonização e promoção do crescimento de plantas. Testou-se a produção de enzimas extracelulares em salinidades 0, 20 e 100 de NaCl bem como a capacidade para solubilizar fosfato e produzir ácido 1-aminociclopropano-1-carboxilato desaminase. H. locisalis e I. seosinesis, considerados como mais interessantes face às características promotoras do crescimento, foram testados separadamente e em conjunto, como inóculo em sementes de alface. Foi aplicado um desenho experimental fatorial para testar o efeito da inoculação e da salinidade da água de irrigação sobre a eficiência de germinação das sementes e crescimento das plantas. A eficiência de germinação foi fortemente afetada pela salinidade não tendo sido observados efeitos significativos de nenhum dos inóculos testados. Na condição de salinidade 10, a eficiência de germinação foi mais baixa do que com salinidade 0 e o peso das plantas foi significativamente menor nas plantas inoculadas com o consórcio de isolados do que nas plantas não inoculadas. As plantas inoculadas com o consórcio e cultivadas na salinidade 10 apresentaram menor teor de água. As plantas inoculadas separadamente com H. locisalis ou com I. seosinesis cultivadas em salinidade 0, revelaram um aumento do tamanho das folhas relativamente ao controle não inoculado. Embora não tenham sido encontradas evidências de atenuação do stresse salino, o inóculo H. locisalis apresentou um efeito positivo no crescimento das plantas em condições não-salinas, o que demonstra um potencial como bactéria promotora do crescimento de plantas de interesse agrícola.
Projeto nº 029736 - Programa Operacional Regional do Centro (02/SAICT/2017).
Mestrado em Ecologia Aplicada
Books on the topic "PROMOTING BACTERIA (PGPB)"
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Germida, J. J. Growth and nutrition of wheat as affected by interactions between VA mycorrhizae and plant growth-promoting rhizobacteria (PGPR): Final report. [Regina, Sask.]: Saskatchewan Agriculture and Food, 1995.
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Varma, Ajit, Dilfuza Egamberdieva, and Smriti Shrivastava. Plant-Growth-Promoting Rhizobacteria (PGPR) and Medicinal Plants. Springer, 2015.
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Plant-Growth-Promoting Rhizobacteria (PGPR) and Medicinal Plants (Soil Biology Book 42). Springer, 2015.
Find full textBook chapters on the topic "PROMOTING BACTERIA (PGPB)"
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Khalil, Ali Talha, and Zabta Khan Shinwari. "Utilization of Plant Growth-Promoting Bacteria (PGPB) Against Phytopathogens." In Fungal Biology, 53–63. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-04805-0_3.
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Kaymak, Haluk Caglar. "Potential of PGPR in Agricultural Innovations." In Plant Growth and Health Promoting Bacteria, 45–79. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13612-2_3.
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Govindasamy, Venkadasamy, Murugesan Senthilkumar, Vellaichamy Magheshwaran, Upendra Kumar, Pranita Bose, Vikas Sharma, and Kannepalli Annapurna. "Bacillus and Paenibacillus spp.: Potential PGPR for Sustainable Agriculture." In Plant Growth and Health Promoting Bacteria, 333–64. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13612-2_15.
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Saraf, Meenu, Chaitanya Kumar Jha, and Dhara Patel. "The Role of ACC Deaminase Producing PGPR in Sustainable Agriculture." In Plant Growth and Health Promoting Bacteria, 365–85. Berlin, Heidelberg: Springer Berlin Heidelberg, 2010. http://dx.doi.org/10.1007/978-3-642-13612-2_16.
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de Garcia Salamone, Ines E., Russell K. Hynes, and Louise M. Nelson. "Role of Cytokinins in Plant Growth Promotion by Rhizosphere Bacteria." In PGPR: Biocontrol and Biofertilization, 173–95. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-4152-7_6.
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Malik, Garima, Samira Chugh, Sunila Hooda, and Ritu Chaturvedi. "Plant Growth Promoting Rhizobacteria (PGPR)-Assisted Phytoremediation of Contaminated Soils." In Bacterial Endophytes for Sustainable Agriculture and Environmental Management, 71–93. Singapore: Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-4497-9_4.
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Walitang, Denver, Sandipan Samaddar, Aritra Roy Choudhury, Poulami Chatterjee, Shamim Ahmed, and Tongmin Sa. "Diversity and Plant Growth-Promoting Potential of Bacterial Endophytes in Rice." In Plant Growth Promoting Rhizobacteria (PGPR): Prospects for Sustainable Agriculture, 3–17. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6790-8_1.
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Sonawane, Rohit, Ashok S. Jadhav, and Kailash Dakhore. "Yield Maximization in Pigeon Pea (Cajanus cajan L. Millsp.) Through the Application of Plant Growth-Promoting Bacteria." In Plant Growth Promoting Rhizobacteria (PGPR): Prospects for Sustainable Agriculture, 169–74. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6790-8_14.
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Puwanto, Febrina Angelina Samosir, Yuyun Yuwariah, Sumadi, and Tualar Simarmata. "Viability of Pseudomonas plecoglossicida and Rhizobium sp. LM-5 as Liquid Bacterial Fertilizers in Various Formulated Carriers." In Plant Growth Promoting Rhizobacteria (PGPR): Prospects for Sustainable Agriculture, 185–93. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-6790-8_16.
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Naz, Rabia, Sehar Khushhal, Tayyaba Asif, Sara Mubeen, P. Saranraj, and R. Z. Sayyed. "Inhibition of Bacterial and Fungal Phytopathogens Through Volatile Organic Compounds Produced by Pseudomonas sp." In Secondary Metabolites and Volatiles of PGPR in Plant-Growth Promotion, 95–118. Cham: Springer International Publishing, 2022. http://dx.doi.org/10.1007/978-3-031-07559-9_6.
Full textConference papers on the topic "PROMOTING BACTERIA (PGPB)"
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Dinata, Gallyndra Fatkhu, Luqman Qurata Aini, and Abdul Latief Abadi. "Pengaruh Pemberian Plant Growth-Promoting Bacteria Indigenous terhadap Pertumbuhan Tanaman Bawang Merah (Allium ascalonicum)." In Seminar Nasional Semanis Tani Polije 2021. Politeknik Negeri Jember, 2021. http://dx.doi.org/10.25047/agropross.2021.231.
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Penelitian Plant Growth-Promoting Bacteria (PGPB) banyak dikembangkan untuk menerapkan sistem pertanian yang berkelanjutan. Hasil dari eksplorasi PGPB indigenous di alam seperti UB Forest menambah informasi pengendalian hayati yang ramah lingkungan. Tujuan dari penelitian ini adalah untuk mengetahui isolat PGPB indigenous yang diisolasi dari serasah kopi UB Forest memiliki pengaruh terhadap pertumbuhan tanaman bawang merah. Penelitian ini dilakukan pada Februari – April 2020 di KabupatenMalang menggunakan Rancangan Acak Kelompok (RAK) enam perlakuan dan tiga ulangan. Penelitian menggunakan seed treatment pada bibit bawang merah sehat varietas Philip tanpa perlakuan inokulasi patogen. Perlakuan yang digunakan antara lain kontrol dan lima isolat PGPB indigenous yaitu Alcaligenes faecalis, Bacillus mycoides, Clostridium sp., Erwinia sp., dan Pseudomonas sp.Hasil penelitian menunjukkan bahwa pemberian PGPB indigenous memberikan pengaruh yang nyata pada pertumbuhan tinggi tanaman bawang merah. Namun, peningkatan parameter pertumbuhan tersebut tidak diikuti oleh peningkatan jumlah daun dan produksi senyawa ketahanan yaitu enzim peroksida yang dihasilkan pada daun bawang merah. Penelitian ini merupakan penelitian awal untuk menentukan isolat PGPB indigenous yang selanjutnya akan diuji kemampuannya dalam meningkatkan pertumbuhan tanaman bawang merah apabila dilakukan induksi penyakit layu fusarium.
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Kozlovskaya, V. F. "Prospects for the rhizosphere microorganisms integration into agricultural practice as biofertilizers." In CURRENT STATE, PROBLEMS AND PROSPECTS OF THE DEVELOPMENT OF AGRARIAN SCIENCE. Federal State Budget Scientific Institution “Research Institute of Agriculture of Crimea”, 2020. http://dx.doi.org/10.33952/2542-0720-2020-5-9-10-141.
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Chemical fertilizers are a quick way to increase nutrients in the soil, but their use is economically costly and dangerous for the environment. Plant Growth Promoting Bacteria (PGPB) are able to increase the bioavailability of fertilizers through biological nitrogen (N) fixation, as well as potassium (K), phosphorus (P), and zinc (Zn) solubilization. The enhanced amount of soluble macro- and microelements in the close proximity of soil-root interface increases the fertilizer use efficiency ~ by 20-40 %.
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Yanti, Yulmira, Hasmiandy Hamid, Nurbailis Nurbailis, and Ni Luh Suriani. "Plant growth-promoting bacteria (PGPB) consortium to control Moeller’s disease and increase shallots plant growth." In 3RD INTERNATIONAL CONFERENCE OF BIO-BASED ECONOMY FOR APPLICATION AND UTILITY. AIP Publishing, 2023. http://dx.doi.org/10.1063/5.0129042.
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"Biochemical Analysis And Antioxidant Activities Of Spinach By Plant Growth Promoting Bacteria (PGPB) Under Arsenic Stress." In International Conference on Biological Research and Applied Science. Jinnah University for Women, Karachi,Pakistan, 2022. http://dx.doi.org/10.37962/ibras/2022/255-258.
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Iungin, Olga, Ievgeniia Prekrasna, Ihor Bortyanuy, Valeriia Maslak, and Saulius Mickevičius. "Plant Growth-Promoting Characteristics of Antarctic Endophytic Bacteria." In The 9th International Conference on Advanced Materials and Systems. INCDTP - Leather and Footwear Research Institute (ICPI), Bucharest, Romania, 2022. http://dx.doi.org/10.24264/icams-2022.ii.11.
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The work is focused on studying bacteria associated with vascular plants in Antarctic region. Climate changes affecting the Antarctic Peninsula favor the successful colonization of ice-free lands by two Antarctic vascular plants (Deschampsia antarctica and Colobanthus quitensis). Bacteria isolated from D. antarctica collected during the 25th Ukrainian Antarctic Expedition (January-April 2020) along the Western part of the Antarctic Peninsula were studied for plant growth-promoting characteristics (nitrogen fixation, phosphate solubilization, cyclic lipopeptide production, exoprotease production, motility and carbohydrate utilization). The heterotrophy of bacterial isolated from D. antarctica and the presence of a wide range of saccharolytic enzymes for the utilization of mono- and disaccharides in studied cultures were shown. This may indicate the plasticity of metabolism and the high adaptation potential of microorganisms associated with D. antarctica. PGPT of studied bacteria were mostly presented by nitrogen-fixing ability and cyclic lipopeptides synthesis.
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Voropaeva, O. V., Tripti Tripti, A. Kumar, K. A. Panikovskaya, M. G. Maleva, and G. G. Borisova. "Screening of metal tolerant plant growth-promoting endophytic (PGPE) bacteria for the preparation of bioformulation." In 2nd International Scientific Conference "Plants and Microbes: the Future of Biotechnology". PLAMIC2020 Organizing committee, 2020. http://dx.doi.org/10.28983/plamic2020.277.
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Metal tolerant plant growth-promoting bacteria capable of synthesizing IAA from tryptophan, solubilizing phosphates and converting protein nitrogen into ammonia were isolated from plants growing on contaminated soils.
Reports on the topic "PROMOTING BACTERIA (PGPB)"
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Romero Perdomo, Felipe Andrés, Jonathan Alberto Mendoza Labrador, and Germán Andrés Estrada Bonilla. Growth stimulation of perennial ryegrass by plant growth promoting bacteria under limited nutritional conditions. Corporación colombiana de investigación agropecuaria - AGROSAVIA, 2019. http://dx.doi.org/10.21930/agrosavia.poster.2019.10.
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Although there are many studies on plant growth promotion carried out using bacteria on various crops, there is scarce information on the effects of PGPR on the growth of perennial ryegrass (Lolium perenne) cultivated in Colombian high tropics. Ryegrass is one of the most widely cultivated grass in Colombia, and it used as a nutritional source for livestock in intensive dual purpose, milk and meat production systems [1]. Several factors affect pasture degradation, including the following: (i) low planting density before grass initiated, (ii) forage species unsuitable for local conditions, and especially (iii) decrease in soil fertility due to inadequate use of fertilizers [2]. Therefore, the maintenance of pasture growth becomes a pivotal challenge to the sustainable management of Colombian tropical soils under livestock production.
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Crowley, David E., Dror Minz, and Yitzhak Hadar. Shaping Plant Beneficial Rhizosphere Communities. United States Department of Agriculture, July 2013. http://dx.doi.org/10.32747/2013.7594387.bard.
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PGPR bacteria include taxonomically diverse bacterial species that function for improving plant mineral nutrition, stress tolerance, and disease suppression. A number of PGPR are being developed and commercialized as soil and seed inoculants, but to date, their interactions with resident bacterial populations are still poorly understood, and-almost nothing is known about the effects of soil management practices on their population size and activities. To this end, the original objectives of this research project were: 1) To examine microbial community interactions with plant-growth-promoting rhizobacteria (PGPR) and their plant hosts. 2) To explore the factors that affect PGPR population size and activity on plant root surfaces. In our original proposal, we initially prqposed the use oflow-resolution methods mainly involving the use of PCR-DGGE and PLFA profiles of community structure. However, early in the project we recognized that the methods for studying soil microbial communities were undergoing an exponential leap forward to much more high resolution methods using high-throughput sequencing. The application of these methods for studies on rhizosphere ecology thus became a central theme in these research project. Other related research by the US team focused on identifying PGPR bacterial strains and examining their effective population si~es that are required to enhance plant growth and on developing a simulation model that examines the process of root colonization. As summarized in the following report, we characterized the rhizosphere microbiome of four host plant species to determine the impact of the host (host signature effect) on resident versus active communities. Results of our studies showed a distinct plant host specific signature among wheat, maize, tomato and cucumber, based on the following three parameters: (I) each plant promoted the activity of a unique suite of soil bacterial populations; (2) significant variations were observed in the number and the degree of dominance of active populations; and (3)the level of contribution of active (rRNA-based) populations to the resident (DNA-based) community profiles. In the rhizoplane of all four plants a significant reduction of diversity was observed, relative to the bulk soil. Moreover, an increase in DNA-RNA correspondence indicated higher representation of active bacterial populations in the residing rhizoplane community. This research demonstrates that the host plant determines the bacterial community composition in its immediate vicinity, especially with respect to the active populations. Based on the studies from the US team, we suggest that the effective population size PGPR should be maintained at approximately 105 cells per gram of rhizosphere soil in the zone of elongation to obtain plant growth promotion effects, but emphasize that it is critical to also consider differences in the activity based on DNA-RNA correspondence. The results ofthis research provide fundamental new insight into the composition ofthe bacterial communities associated with plant roots, and the factors that affect their abundance and activity on root surfaces. Virtually all PGPR are multifunctional and may be expected to have diverse levels of activity with respect to production of plant growth hormones (regulation of root growth and architecture), suppression of stress ethylene (increased tolerance to drought and salinity), production of siderophores and antibiotics (disease suppression), and solubilization of phosphorus. The application of transcriptome methods pioneered in our research will ultimately lead to better understanding of how management practices such as use of compost and soil inoculants can be used to improve plant yields, stress tolerance, and disease resistance. As we look to the future, the use of metagenomic techniques combined with quantitative methods including microarrays, and quantitative peR methods that target specific genes should allow us to better classify, monitor, and manage the plant rhizosphere to improve crop yields in agricultural ecosystems. In addition, expression of several genes in rhizospheres of both cucumber and whet roots were identified, including mostly housekeeping genes. Denitrification, chemotaxis and motility genes were preferentially expressed in wheat while in cucumber roots bacterial genes involved in catalase, a large set of polysaccharide degradation and assimilatory sulfate reduction genes were preferentially expressed.
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Thomashow, Linda, Leonid Chernin, Ilan Chet, David M. Weller, and Dmitri Mavrodi. Genetically Engineered Microbial Agents for Biocontrol of Plant Fungal Diseases. United States Department of Agriculture, 2005. http://dx.doi.org/10.32747/2005.7696521.bard.
Full textAbstract:
The objectives of the project were: a) to construct the site-specific integrative expression cassettes carrying: (i) the chiA gene for a 58-kDa endochitinase, (ii) the pyrrolnitrin biosynthesis operon, and (iii) the acdS gene encoding ACC deaminase; b) to employ these constructs to engineer stable recombinant strains with an expanded repertoire of beneficial activities; c) to evaluate the rhizosphere competence and antifungal activity of the WT and modified strains against pathogenic fungi under laboratory and greenhouse conditions; and d) to monitor the persistence and impact of the introduced strains on culturable and nonculturable rhizosphere microbial populations in the greenhouse and the field. The research generally support our concepts that combining strategically selected genes conferring diverse modes of action against plant pathogens into one organism can improve the efficacy of biological control agents. We hypothesized that biocontrol agents (BCAs) engineered to expand their repertoire of beneficial activities will more effectively control soilborne plant pathogens. In this work, we demonstrated that biocontrol activity of Pseudomonas fluorescens Q8r1-96 and Q2-87, both producing the antibiotic 2,4-diacetylphloroglucinol (2,4-DAPG) effective against the plant pathogenic fungus Rhizoctonia solani, can be improved significantly by introducing and expressing either the 1.6-kb gene chiA, encoding the 58-kDa endochitinase ChiA from the rhizosphere strain SerratiaplymuthicaIC1270, or the 5.8-kb prnABCDoperon encoding the broad-range antibiotic pyrrolnitrin (Prn) from another rhizosphere strain, P. fluorescens Pf-5. The PₜₐcchiAandPₜₐcprnABCDcassettes were cloned into the integrative pBK-miniTn7-ΩGm plasmid, and inserted into the genomic DNA of the recipient bacteria. Recombinant derivatives of strains Q8r1-96 and Q2-87 expressing the PₜₐcchiA or PₜₐcprnABCD cassettes produced endochitinase ChiA, or Prn, respectively, in addition to 2,4-DAPG, and the recombinants gave significantly better biocontrol of R. solani on beans under greenhouse conditions. The disease reduction index increased in comparison to the parental strains Q8r1-96 and Q2-87 to 17.5 and 39.0% from 3.2 and 12.4%, respectively, in the case of derivatives carrying the PₜₐcchiAcassette and to 63.1 and 70% vs. 2.8 and 12,4%, respectively, in the case of derivatives carrying the PₜₐcprnABCDcassette. The genetically modified strains exhibited persistence and non-target effects comparable to those of the parental strains in greenhouse soil. Three integrative cassettes carrying the acdS gene encoding ACC deaminase cloned under the control of different promoters were constructed and tested for enhancement of plant growth promotion by biocontrol strains of P. fluorescens and S. plymuthica. The integrative cassettes constructed in this work are already being used as a simple and efficient tool to improve biocontrol activity of various PGPR bacteria against fungi containing chitin in the cell walls or highly sensitive to Prn. Some parts of the work (e. g., construction of integrative cassettes) was collaborative while other parts e.g., (enzyme and antibiotic activity analyses) were fully synergistic. The US partners isolated and provided to the Israeli collaborators the original biocontrol strains P. fluorescens strains Q8r1-96 and Q2-87 and their mutants deficient in 2,4-DAPG production, which were used to evaluate the relative importance of introduction of Prn, chitinase or ACC deaminase genes for improvement of the biocontrol activity of the parental strains. The recombinant strains obtained at HUJI were supplied to the US collaborators for further analysis.