Готові списки джерел за темами / Symbiosis-related phenotypes

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Добірка наукової літератури з теми "Symbiosis-related phenotypes"

Автор: Grafiati

Опубліковано: 10 березня 2023

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Статті в журналах з теми "Symbiosis-related phenotypes"

Humann, Jodi L., Hope T. Ziemkiewicz, Svetlana N. Yurgel, and Michael L. Kahn. "Regulatory and DNA Repair Genes Contribute to the Desiccation Resistance of Sinorhizobium meliloti Rm1021." Applied and Environmental Microbiology 75, no. 2 (November 21, 2008): 446–53. http://dx.doi.org/10.1128/aem.02207-08.

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ABSTRACT Sinorhizobium meliloti can form a nitrogen-fixing symbiotic relationship with alfalfa after bacteria in the soil infect emerging root hairs of the growing plant. To be successful at this, the bacteria must be able to survive in the soil between periods of active plant growth, including when conditions are dry. The ability of S. meliloti to withstand desiccation has been known for years, but genes that contribute to this phenotype have not been identified. Transposon mutagenesis was used in combination with novel screening techniques to identify four desiccation-sensitive mutants of S. meliloti Rm1021. DNA sequencing of the transposon insertion sites identified three genes with regulatory functions (relA, rpoE2, and hpr) and a DNA repair gene (uvrC). Various phenotypes of the mutants were determined, including their behavior on several indicator media and in symbiosis. All of the mutants formed an effective symbiosis with alfalfa. To test the hypothesis that UvrC-related excision repair was important in desiccation resistance, uvrA, uvrB, and uvrC deletion mutants were also constructed. These strains were sensitive to DNA damage induced by UV light and 4-NQO and were also desiccation sensitive. These data indicate that uvr gene-mediated DNA repair and the regulation of stress-induced pathways are important for desiccation resistance.

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Liu, Wei, Yan Li, Xue Bai, Haiguang Wu, Lanxing Bian, and Xiaoke Hu. "LuxR-Type Regulator AclR1 of Azorhizobium caulinodans Regulates Cyclic di-GMP and Numerous Phenotypes in Free-Living and Symbiotic States." Molecular Plant-Microbe Interactions® 33, no. 3 (March 2020): 528–38. http://dx.doi.org/10.1094/mpmi-10-19-0306-r.

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LuxR-type regulators play important roles in transcriptional regulation in bacteria and control various biological processes. A genome sequence analysis showed the existence of seven LuxR-type regulators in Azorhizobium caulinodans ORS571, an important nitrogen-fixing bacterium in both its free-living state and in symbiosis with its host, Sesbania rostrata. However, the functional mechanisms of these regulators remain unclear. In this study, we identified a LuxR-type regulator that contains a cheY-homologous receiver (REC) domain in its N terminus and designated it AclR1. Interestingly, phylogenetic analysis revealed that AclR1 exhibited relatively close evolutionary relationships with MalT/GerE/FixJ/NarL family proteins. Functional analysis of an aclR1 deletion mutant (ΔaclR1) in the free-living state showed that AclR1 positively regulated cell motility and flocculation but negatively regulated exopolysaccharide production, biofilm formation, and second messenger cyclic diguanylate (c-di-GMP)-related gene expression. In the symbiotic state, the ΔaclR1 mutant was defective in competitive colonization and nodulation on host plants. These results suggested that AclR1 could provide bacteria with the ability to compete effectively for symbiotic nodulation. Overall, our results show that the REC-LuxR-type regulator AclR1 regulates numerous phenotypes both in the free-living state and during host plant symbiosis.

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Durán, David, Luis Rey, Juan Mayo, Doris Zúñiga-Dávila, Juan Imperial, Tomás Ruiz-Argüeso, Esperanza Martínez-Romero, and Ernesto Ormeño-Orrillo. "Bradyrhizobium paxllaeri sp. nov. and Bradyrhizobium icense sp. nov., nitrogen-fixing rhizobial symbionts of Lima bean (Phaseolus lunatus L.) in Peru." International Journal of Systematic and Evolutionary Microbiology 64, Pt_6 (June 1, 2014): 2072–78. http://dx.doi.org/10.1099/ijs.0.060426-0.

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A group of strains isolated from root nodules of Phaseolus lunatus (Lima bean) in Peru were characterized by genotypic, genomic and phenotypic methods. All strains possessed identical 16S rRNA gene sequences that were 99.9 % identical to that of Bradyrhizobium lablabi CCBAU 23086T. Despite having identical 16S rRNA gene sequences, the Phaseolus lunatus strains could be divided into two clades by sequence analysis of recA, atpD, glnII, dnaK and gyrB genes. The genome sequence of a representative of each clade was obtained and compared to the genomes of closely related species of the genus Bradyrhizobium . Average nucleotide identity values below the species circumscription threshold were obtained when comparing the two clades to each other (88.6 %) and with all type strains of the genus Bradyrhizobium (≤92.9 %). Phenotypes distinguishing both clades from all described and closely related species of the genus Bradyrhizobium were found. On the basis of the results obtained, two novel species, Bradyrhizobium paxllaeri sp. nov. (type strain LMTR 21T = DSM 18454T = HAMBI 2911T) and Bradyrhizobium icense sp. nov. (type strain LMTR 13T = HAMBI 3584T = CECT 8509T = CNPSo 2583T), are proposed to accommodate the uncovered clades of Phaseolus lunatus bradyrhizobia. These species share highly related but distinct nifH and nodC symbiosis genes.

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Marie, Corinne, William J. Deakin, Tuula Ojanen-Reuhs, Ericka Diallo, Brad Reuhs, William J. Broughton, and Xavier Perret. "TtsI, a Key Regulator of Rhizobium Species NGR234 Is Required for Type III-Dependent Protein Secretion and Synthesis of Rhamnose-Rich Polysaccharides." Molecular Plant-Microbe Interactions® 17, no. 9 (September 2004): 958–66. http://dx.doi.org/10.1094/mpmi.2004.17.9.958.

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Formation of nitrogen-fixing nodules on legume roots by Rhizobium sp. NGR234 requires an array of bacterial factors, including nodulation outer proteins (Nops) secreted through a type III secretion system (TTSS). Secretion of Nops is abolished upon inactivation of ttsI (formerly y4xI), a protein with characteristics of two-component response regulators that was predicted to activate transcription of TTSS-related genes. During the symbiotic interaction, the phenotype of NGRΩttsI differs from that of a mutant with a nonfunctional secretion machine, however. This indicated that TtsI regulates the synthesis of other symbiotic factors as well. Conserved sequences, called tts boxes, proposed to act as binding sites for TtsI, were identified not only within the TTSS cluster but also in the promoter regions of i) genes predicted to encode homologs of virulence factors secreted by pathogenic bacteria, ii) loci involved in the synthesis of a rhamnose-rich component (rhamnan) of the lipopolysaccharides (LPS), and iii) open reading frames that play roles in plasmid partitioning. Transcription studies showed that TtsI and tts boxes are required for the activation of TTSS-related genes and those involved in rhamnose synthesis. Furthermore, extraction of polysaccharides revealed that inactivation of ttsI abolishes the synthesis of the rhamnan component of the LPS. The phenotypes of mutants impaired in TTSS-dependent protein secretion, rhamnan synthesis, or in both functions were compared to assess the roles of some of the TtsI-controlled factors during symbiosis.

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Robbins, Michael. "Psychoanalytic and Biological Approaches to Mental Illness: Schizophrenia." Journal of the American Psychoanalytic Association 40, no. 2 (April 1992): 425–54. http://dx.doi.org/10.1177/000306519204000206.

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Biological psychiatrists tend to look upon the phenomena of mind and meaning, which are the data of psychoanalysis, as meaningless epiphenomena, and propose reductive explanations of complex mental states, whereas psychoanalysis tend to ignore the proliferation of neurobiological data indicating the importance of constitutional factors in mental illness. Interactive models which confuse biological causes and psychological consequences, or vice-versa, are theoretically unsound. A scientific model hierarchy is proposed, along with some principles for coexistence and collaboration between neurobiology and psychoanalysis. The problem is illustrated with schizophrenia, a condition whose probable biological underpinnings are now generally considered to remove it from the realm of psychoanalysis. Schizophrenia-vulnerable phenotypes consistent with organic findings and clinical observations are hypothesized, and some ideas about their development in the context of early object relations, leading to pathological forms of symbiosis, are elaborated. A neurobiological rationale for the psychoanalytic treatment of schizophrenia is presented, and special problems related to the biological and symbiotic substrate are examined.

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Zhao, Wenlong, Huixia Zhu, Feng Wei, Donglai Zhou, Youguo Li, and Xue-Xian Zhang. "Investigating the Involvement of Cytoskeletal Proteins MreB and FtsZ in the Origin of Legume-Rhizobial Symbiosis." Molecular Plant-Microbe Interactions® 34, no. 5 (May 2021): 547–59. http://dx.doi.org/10.1094/mpmi-10-20-0299-fi.

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Rhizobia are rod-shaped bacteria that form nitrogen-fixing root nodules on leguminous plants; however, they don’t carry MreB, a key determinant of rod-like cell shape. Here, we introduced an actin-like mreB homolog from a pseudomonad into Mesorhizobium huakuii 7653R (a microsymbiont of Astragalus sinicus L.) and examined the molecular, cellular, and symbiotic phenotypes of the resultant mutant. Exogenous mreB caused an enlarged cell size and slower growth in laboratory medium. However, the mutant formed small, ineffective nodules on A. sinicus (Nod+ Fix−), and rhizobial cells in the infection zone were unable to differentiate into bacteroids. RNA sequencing analysis also revealed minor effects of mreB on global gene expression in free-living cells but larger effects for cells grown in planta. Differentially expressed nodule-specific genes include cell cycle regulators such as the tubulin-like ftsZ1 and ftsZ2. Unlike the ubiquitous FtsZ1, an FtsZ2 homolog was commonly found in Rhizobium, Sinorhizobium, and Mesorhizobium spp. but not in closely related nonsymbiotic species. Bacterial two-hybrid analysis revealed that MreB interacts with FtsZ1 and FtsZ2, which are targeted by the host-derived nodule-specific cysteine-rich peptides. Significantly, MreB mutation D283A disrupted the protein–protein interactions and restored the aforementioned phenotypic defects caused by MreB in M. huakuii. Together, our data indicate that MreB is detrimental for modern rhizobia and its interaction with FtsZ1 and FtsZ2 causes the symbiotic process to cease at the late stage of bacteroid differentiation. These findings led to a hypothesis that loss of mreB in the common ancestor of members of Rhizobiales and subsequent acquisition of ftsZ2 are critical evolutionary steps leading to legume-rhizobial symbiosis. [Formula: see text] Copyright © 2021 The Author(s). This is an open access article distributed under the CC BY-NC-ND 4.0 International license .

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Papa, M. F. Del, M. Pistorio, W. O. Draghi, M. J. Lozano, M. A. Giusti, C. Medina, P. van Dillewijn, et al. "Identification and Characterization of a nodH Ortholog from the Alfalfa-Nodulating Or191-Like Rhizobia." Molecular Plant-Microbe Interactions® 20, no. 2 (February 2007): 138–45. http://dx.doi.org/10.1094/mpmi-20-2-0138.

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Nodulation of Medicago sativa (alfalfa) is known to be restricted to Sinorhizobium meliloti and a few other rhizobia that include the poorly characterized isolates related to Rhizobium sp. strain Or191. Distinctive features of the symbiosis between alfalfa and S. meliloti are the marked specificity from the plant to the bacteria and the strict requirement for the presence of sulfated lipochitooligosac-charides (Nod factors [NFs]) at its reducing end. Here, we present evidence of the presence of a functional nodH-encoded NF sulfotransferase in the Or191-like rhizobia. The nodH gene, present in single copy, maps to a high molecular weight megaplasmid. As in S. meliloti, a nodF homolog was identified immediately upstream of nodH that was transcribed in the opposite direction (local synteny). This novel nodH ortholog was cloned and shown to restore both NF sulfation and the Nif+Fix+ phenotypes when introduced into an S. meliloti nodH mutant. Unexpectedly, however, nodH disruption in the Or191-like bacteria did not abolish their ability to nodulate alfalfa, resulting instead in a severely delayed nodulation. In agreement with evidence from other authors, the nodH sequence analysis strongly supports the idea that the Or191-like rhizobia most likely represent a genetic mosaic resulting from the horizontal transfer of symbiotic genes from a sinorhizobial megaplas-mid to a not yet clearly identified ancestor.

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Liu, Bin, Ke Liu, Xiaorong Chen, Duohong Xiao, Tingjin Wang, Yang Yang, Hui Shuai, Sumei Wu, Lu Yuan, and Liping Chen. "Comparative Transcriptome Analysis Reveals the Interaction of Sugar and Hormone Metabolism Involved in the Root Hair Morphogenesis of the Endangered Fir Abies beshanzuensis." Plants 12, no. 2 (January 6, 2023): 276. http://dx.doi.org/10.3390/plants12020276.

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Abies beshanzuensis, an extremely rare and critically endangered plant with only three wild adult trees globally, is strongly mycorrhizal-dependent, leading to difficulties in protection and artificial breeding without symbiosis. Root hair morphogenesis plays an important role in the survival of mycorrhizal symbionts. Due to the lack of an effective genome and transcriptome of A. beshanzuensis, the molecular signals involved in the root hair development remain unknown, which hinders its endangered mechanism analysis and protection. Herein, transcriptomes of radicles with root hair (RH1) and without root hair (RH0) from A. beshanzuensis in vitro plantlets were primarily established. Functional annotation and differentially expressed gene (DEG) analysis showed that the two phenotypes have highly differentially expressed gene clusters. Transcriptome divergence identified hormone and sugar signaling primarily involved in root hair morphogenesis of A. beshanzuensis. Weighted correlation network analysis (WGCNA) coupled with quantitative real-time PCR (qRT-PCR) found that two hormone–sucrose–root hair modules were linked by IAA17, and SUS was positioned in the center of the regulation network, co-expressed with SRK2E in hormone transduction and key genes related to root hair morphogenesis. Our results contribute to better understanding of the molecular mechanisms of root hair development and offer new insights into deciphering the survival mechanism of A. beshanzuensis and other endangered species, utilizing root hair as a compensatory strategy instead of poor mycorrhizal growth.

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Cohen, Michael F., and Hideo Yamasaki. "Flavonoid-Induced Expression of a Symbiosis-Related Gene in the Cyanobacterium Nostoc punctiforme." Journal of Bacteriology 182, no. 16 (August 15, 2000): 4644–46. http://dx.doi.org/10.1128/jb.182.16.4644-4646.2000.

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ABSTRACT The flavonoid naringin was found to induce the expression ofhrmA, a gene with a symbiotic phenotype in the cyanobacterium Nostoc punctiforme. A comparative analysis of several flavonoids revealed the 7-O-neohesperidoside, 4′-OH, and C-2-C-3 double bond in naringin as structural determinants of its hrmA-inducing activity.

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diCenzo, George C., Maryam Zamani, Hannah N. Ludwig, and Turlough M. Finan. "Heterologous Complementation Reveals a Specialized Activity for BacA in the Medicago–Sinorhizobium meliloti Symbiosis." Molecular Plant-Microbe Interactions® 30, no. 4 (April 2017): 312–24. http://dx.doi.org/10.1094/mpmi-02-17-0030-r.

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The bacterium Sinorhizobium meliloti Rm2011 forms N2-fixing root nodules on alfalfa and other leguminous plants. The pSymB chromid contains a 110-kb region (the ETR region) showing high synteny to a chromosomally located region in Sinorhizobium fredii NGR234 and related rhizobia. We recently introduced the ETR region from S. fredii NGR234 into the S. meliloti chromosome. Here, we report that, unexpectedly, the S. fredii NGR234 ETR region did not complement deletion of the S. meliloti ETR region in symbiosis with Medicago sativa. This phenotype was due to the bacA gene of NGR234 not being functionally interchangeable with the S. meliloti bacA gene during M. sativa symbiosis. Further analysis revealed that, whereas bacA genes from S. fredii or Rhizobium leguminosarum bv. viciae 3841 failed to complement the Fix− phenotype of a S. meliloti bacA mutant with M. sativa, they allowed for further developmental progression prior to a loss of viability. In contrast, with Melilotus alba, bacA from S. fredii and R. leguminosarum supported N2 fixation by a S. meliloti bacA mutant. Additionally, the S. meliloti bacA gene can support N2 fixation of a R. leguminosarum bacA mutant during symbiosis with Pisum sativum. A phylogeny of BacA proteins illustrated that S. meliloti BacA has rapidly diverged from most rhizobia and has converged toward the sequence of pathogenic genera Brucella and Escherichia. These data suggest that the S. meliloti BacA has evolved toward a specific interaction with Medicago and highlights the limitations of using a single model system for the study of complex biological topics.

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Дисертації з теми "Symbiosis-related phenotypes"

SPINI, GIULIA. "Response of the symbiont Ensifer meliloti to the plant flavonoid lutelin: not only symbiosis." Doctoral thesis, 2016. http://hdl.handle.net/2158/1028231.

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The present work was mainly addressed to provide an extensive phenotypic investigation of the luteolin effects on the phenotypes of E. meliloti to get an interpretative framework in modeling luteolin-induced metabolic switches. In the context of the luteolin-responsive phenotypes, the changes dependent or independent from the NodD regulation (i.e the major luteolin sensor) were elucidated using a deletion nodD mutant of E. meliloti and the possible contribution of other luteolin mediators, beyond NodD, was then investigated.

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