Journal ArticleDOI
Genetic regulation of biological nitrogen fixation
Ray Dixon,Daniel Kahn +1 more
TLDR
The ability of microorganisms to use nitrogen gas as the sole nitrogen source and engage in symbioses with host plants confers many ecological advantages, but also incurs physiological penalties because the process is oxygen sensitive and energy dependent.Abstract:
Some bacteria have the remarkable capacity to fix atmospheric nitrogen to ammonia under ambient conditions, a reaction only mimicked on an industrial scale by a chemical process that requires high temperatures, elevated pressure and special catalysts. The ability of microorganisms to use nitrogen gas as the sole nitrogen source and engage in symbioses with host plants confers many ecological advantages, but also incurs physiological penalties because the process is oxygen sensitive and energy dependent. Consequently, biological nitrogen fixation is highly regulated at the transcriptional level by sophisticated regulatory networks that respond to multiple environmental cues.read more
Citations
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Plant growth-promoting rhizobacteria and root system functioning.
Jordan Vacheron,Guilhem Desbrosses,Marie-Lara Bouffaud,Bruno Touraine,Yvan Moënne-Loccoz,Daniel Muller,Laurent Legendre,Florence Wisniewski-Dyé,Claire Prigent-Combaret +8 more
TL;DR: Novel knowledge and gaps on PGPR modes of action and signals are addressed, recent progress on the links between plant morphological and physiological effects induced by PGPR are highlighted, and the importance of taking into account the size, diversity, and gene expression patterns of PGPR assemblages in the rhizosphere to better understand their impact on plant growth and functioning is shown.
Journal ArticleDOI
Plant growth-promoting bacteria as inoculants in agricultural soils.
TL;DR: An overview of the importance of soil-plant-microbe interactions to the development of efficient inoculants, once PGPB are extensively studied microorganisms is presented, representing a very diverse group of easily accessible beneficial bacteria.
Journal ArticleDOI
Nitrogen-fixing bacteria associated with leguminous and non-leguminous plants
TL;DR: A wide diversity of nitrogen-fixing bacterial species belonging to most phyla of the Bacteria domain have the capacity to colonize the rhizosphere and to interact with plants.
Journal ArticleDOI
Transport and metabolism in legume-rhizobia symbioses
TL;DR: Current knowledge of legume and rhizobial transport and metabolism as they relate to symbiotic nitrogen fixation is reviewed.
Journal ArticleDOI
Biological nitrogen fixation: rates, patterns and ecological controls in terrestrial ecosystems.
TL;DR: This work estimates terrestrial BNF for a pre-industrial world by combining information on N fluxes with 15N relative abundance data for terrestrial ecosystems, and suggests that the magnitude of human alternation of the N cycle is substantially larger than has been assumed.
References
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Journal ArticleDOI
PAS Domains: Internal Sensors of Oxygen, Redox Potential, and Light
Barry L. Taylor,Igor B. Zhulin +1 more
TL;DR: PAS domains are newly recognized signaling domains that are widely distributed in proteins from members of the Archaea and Bacteria and from fungi, plants, insects, and vertebrates that function as input modules in proteins that sense oxygen, redox potential, light, and some other stimuli.
Journal ArticleDOI
Nitrogenase MoFe-protein at 1.16 A resolution: a central ligand in the FeMo-cofactor.
Oliver Einsle,Oliver Einsle,F. Akif Tezcan,Susana L. A. Andrade,Susana L. A. Andrade,Benedikt Schmid,Mika Yoshida,Mika Yoshida,James B. Howard,Douglas C. Rees,Douglas C. Rees +10 more
TL;DR: A high-resolution crystallographic analysis of the nitrogenase MoFe-protein reveals a previously unrecognized ligand coordinated to six iron atoms in the center of the catalytically essential FeMo-cofactor, consistent with this newly detected component being a light element, most plausibly nitrogen.
Journal ArticleDOI
GHKL, an emergent ATPase/kinase superfamily.
Rinku Dutta,Masayori Inouye +1 more
TL;DR: A novel ATP-binding superfamily that includes diverse protein families such as DNA topoisomerase II, molecular chaperones Hsp90, DNA-mismatch-repair enzymes MutL and histidine kinases is recognition.
Journal ArticleDOI
Genetic regulation of nitrogen fixation in rhizobia.
TL;DR: Although the involvement of FixLJ and FixK in nifA regulation is remarkably different in the three rhizobial species discussed here, they constitute a regulatory cascade that uniformly controls the expression of genes (fixNOQP) encoding a distinct cytochrome oxidase complex probably required for bacterial respiration under low-oxygen conditions.