Journal ArticleDOI
Nitrogen-fixing bacteria associated with leguminous and non-leguminous plants
TLDR
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.Abstract:
Nitrogen is generally considered one of the major limiting nutrients in plant growth. The biological process responsible for reduction of molecular nitrogen into ammonia is referred to as nitrogen fixation. 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. Leguminous and actinorhizal plants can obtain their nitrogen by association with rhizobia or Frankia via differentiation on their respective host plants of a specialized organ, the root nodule. Other symbiotic associations involve heterocystous cyanobacteria, while increasing numbers of nitrogen-fixing species have been identified as colonizing the root surface and, in some cases, the root interior of a variety of cereal crops and pasture grasses. Basic and advanced aspects of these associations are covered in this review.read more
Citations
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Acquisition of phosphorus and nitrogen in the rhizosphere and plant growth promotion by microorganisms
Alan Richardson,José Miguel Barea,Ann McNeill,Claire Prigent-Combaret,Claire Prigent-Combaret +4 more
TL;DR: Features of the rhizosphere that are important for nutrient acquisition from soil are reviewed, with specific emphasis on the characteristics of roots that influence the availability and uptake of phosphorus and nitrogen.
Journal ArticleDOI
Rhizosphere microbiome assemblage is affected by plant development.
TL;DR: It is surmised that plants secrete blends of compounds and specific phytochemicals in the root exudates that are differentially produced at distinct stages of development to help orchestrate rhizosphere microbiome assemblage.
Journal ArticleDOI
Competition between roots and microorganisms for nitrogen: mechanisms and ecological relevance
TL;DR: In this article, the authors evaluate competitive and mutualistic interactions between plants and microorganisms and analyse the ecological consequences of these interactions in the rhizosphere, and they find that despite strong competition between roots and micro-organisms for N, a temporal niche differentiation reflecting their generation times leads to mutualistic relationships in the root network.
Journal ArticleDOI
Role of Plant Growth Promoting Rhizobacteria in Agricultural Sustainability-A Review.
TL;DR: There is a gap between the mode of action (mechanism) of the PGPR for plant growth and the role of thePGPR as biofertilizer—thus the importance of nano-encapsulation technology in improving the efficacy of PGPR is highlighted.
Journal ArticleDOI
The role of mycorrhizae and plant growth promoting rhizobacteria (PGPR) in improving crop productivity under stressful environments.
TL;DR: The key mechanisms involved in plant stress tolerance and the effectiveness of microbial inoculation for enhancing plant growth under stress conditions have been discussed at length in this review.
References
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Journal ArticleDOI
Inactivation of patS and hetN causes lethal levels of heterocyst differentiation in the filamentous cyanobacterium Anabaena sp. PCC 7120.
Pritty B. Borthakur,Christine C. Orozco,Shirley S. Young-Robbins,Robert Haselkorn,Sean M. Callahan +4 more
TL;DR: It is shown that the patS‐ and hetN‐dependent suppression pathways are the only major factors that prevent vegetative cells from differentiating into heterocysts when a source of ammonia is not present.
Journal ArticleDOI
Characterization of NopP, a Type III Secreted Effector of Rhizobium sp. Strain NGR234
Nora Ausmees,Hajime Kobayashi,William J. Deakin,Corinne Marie,Hari B. Krishnan,William J. Broughton,Xavier Perret +6 more
TL;DR: The type three secretion system encoded by pNGR234a, the symbiotic plasmid of Rhizobium sp.
Journal ArticleDOI
Fluorescent antibody technique to identify Azospirillum brasilense associated with roots of grasses
S. C. Schank,Rex L. Smith,G. C. Weiser,David A. Zuberer,J. H. Bouton,Kenneth H. Quesenberry,M. E. Tyler,J. R. Milam,R. C. Littell +8 more
TL;DR: Bacteria associated with roots of grasses from Florida, Ecuador and Venezuela were isolated and their N 2 -fixing ability was demonstrated by C 2 H 2 reduction assay and classification as Azospirillum brasilense was classified.
Journal ArticleDOI
Chemical signalling in cyanobacterial-plant symbioses
TL;DR: The basis of the interaction between cyanobacteria and plants is explored, and the significance of this — both to the evolution of chloroplasts and to the potential for encouraging nitrogen-fixing symbioses in crop plants are discussed.
Journal ArticleDOI
A transcriptional regulator of the LuxR-UhpA family, FlcA, controls flocculation and wheat root surface colonization by Azospirillum brasilense Sp7.
TL;DR: Characterization of the resulting mutant strains showed that flcA controls the production of capsular polysaccharides, the flocculation process in culture, and the colonization of the root surface of wheat.