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
More filters
Journal ArticleDOI
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
More filters
Journal ArticleDOI
The genome of Rhizobium leguminosarum has recognizable core and accessory components
J. Peter W. Young,Lisa Crossman,Andrew W. B. Johnston,Nicholas R. Thomson,Zara Ghazoui,Katherine H Hull,Margaret Wexler,Andrew R. J. Curson,Jonathan D. Todd,Philip S. Poole,Tim H. Mauchline,Alison K. East,Michael A. Quail,Carol Churcher,Claire Arrowsmith,Inna Cherevach,Tracey Chillingworth,Kay Clarke,Ann Cronin,Paul Davis,Audrey Fraser,Zahra Hance,Heidi Hauser,Kay Jagels,Sharon Moule,Karen Mungall,Halina Norbertczak,Ester Rabbinowitsch,Mandy Sanders,Mark Simmonds,Sally Whitehead,Julian Parkhill +31 more
TL;DR: The genome of R. leguminosarum can be considered to have two main components: a 'core', which is higher in G+C, is mostly chromosomal, is shared with related organisms, and has a consistent phylogeny; and an 'accessory' component, which is sporadic in distribution, lower in G-C, and located on the plasmids and chromosomal islands.
Journal ArticleDOI
Regulation of symbiotic root nodule development
Michael Schultze,Adam Kondorosi +1 more
TL;DR: This review focuses on how the production of Nod factors is regulated, how these signals are perceived and transduced by the plant root, and the physiological conditions and plant factors that control the early events leading to root nodule development.
Journal ArticleDOI
Root nodulation and infection factors produced by rhizobial bacteria
TL;DR: Recent advances in the understanding of the biosynthesis, secretion, and regulation of production of these glycans are reviewed, and their functions are compared with glycans produced by other bacteria, such as plant pathogens.
Journal ArticleDOI
Use of degenerate oligonucleotides for amplification of the nifH gene from the marine cyanobacterium Trichodesmium thiebautii.
Jonathan P. Zehr,L A McReynolds +1 more
TL;DR: Examination of the DNA and presumed amino acid sequence shows that the gene is most closely related to that of Anabaena spp.
Book
Methods for evaluating biological nitrogen fixation
TL;DR: The techniques described range from the imaginative use of plastic sandwich bags, beer and baby bottles to extended X-ray absorption edge and fine structure spectroscopy (‘EXAFS’), and the hazards to overcome extend from microbial contamination to destruction of field trials by elephants.