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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A novel plant-fungus symbiosis benefits the host without forming mycorrhizal structures.
TL;DR: This work is a starting point for detailed mechanistic studies on other basidiomycete-woody plant relationships, where a continuum between heterotrophic rhizosphere fungi and plant beneficial symbioses is likely to exist.
Journal ArticleDOI
Streptomyces thermoautotrophicus does not fix nitrogen
Drew C. MacKellar,Drew C. MacKellar,Lucas Lieber,Lucas Lieber,Jeffrey S. Norman,Anthony Bolger,Cory Tobin,James W. Murray,Mehtap Oksaksin,Roger L. Chang,Tyler J. Ford,Peter Q. Nguyen,Jimmy Woodward,Hugo R. Permingeat,Neel Joshi,Pamela A. Silver,Pamela A. Silver,Björn Usadel,Alfred W. Rutherford,Maren L. Friesen,Jürgen Prell +20 more
TL;DR: The species containing strains UBT1, H1, and P1-2 are proposed as a non-Streptomycete, non-diazotrophic, facultative chemolithoautotroph and it is concluded that the existence of the previously proposed oxygen-tolerant nitrogenase is extremely unlikely.
Journal ArticleDOI
Legume-rhizobium symbiotic promiscuity and effectiveness do not affect plant invasiveness.
TL;DR: Results support recent findings that root nodule rhizobial diversity and community composition do not differ between acacias that vary in their invasiveness, and indicate differential symbiotic effectiveness between these species at specific localities.
Journal ArticleDOI
Promising microbial consortia for producing biofertilizers for rice fields
TL;DR: Two cyanobacterial cultures from rice paddies of Kyzylorda Provence, Kazakhstan were isolated and characterized and the active consortium ZOB-1 was selected, which improved germination and growth of rice plants.
Journal ArticleDOI
Phytotoxic mechanisms of bur cucumber seed extracts on lettuce with special reference to analysis of chloroplast proteins, phytohormones, and nutritional elements
Seok-Min Lee,Ramalingam Radhakrishnan,Sang-Mo Kang,Jin-Hyo Kim,In-Yong Lee,Bong-Kyu Moon,Byung-Wook Yoon,In-Jung Lee +7 more
TL;DR: Results of this study suggest that extracts of bur cucumber seeds can be an effective eco-friendly bioherbicide for weed control that work by inhibiting mechanisms of photosynthesis and regulating phytohormones and nutritional elements.
References
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Journal ArticleDOI
Generic assignments, strain histories, and properties of pure cultures of cyanobacteria
TL;DR: Revisions are designed to permit the generic identification of cultures, often difficult through use of the field-based system of phycological classification, and are both constant and readily determinable in cultured material.
Journal ArticleDOI
Biological Nitrogen Fixation
Robert H. Burris,Gary P. Roberts +1 more
TL;DR: Highlights in biological nitrogen fixation during the last fifty years are highlighted.
Journal ArticleDOI
Applications of the acetylene-ethylene assay for measurement of nitrogen fixation
TL;DR: The biochemical basis of the assay is described along with relevant characteristics including Km, C2H2/N2 conversion factor, and specific N2[C2H 2]-fixing activities obtained with various systems, and methods of measurement of N2 fixation are compared.
Journal ArticleDOI
Coordinating nodule morphogenesis with rhizobial infection in legumes.
TL;DR: This review focuses on the tissue-specific nature of the developmental processes associated with nodulation and the mechanisms by which these processes are coordinated during the formation of a nodule.
Journal ArticleDOI
Genetic regulation of biological nitrogen fixation
Ray Dixon,Daniel Kahn +1 more
TL;DR: 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.