Nitrogen fixation ofSesbania rostrata: Contribution of stem nodules to nitrogen acquisition
نویسندگان
چکیده
منابع مشابه
Fixation of isotopic nitrogen by excised nodules.
After 60 years of research in symbiotic nitrogen fixation, the agent of fixation has not been established. Apparently only two biological species, leguminous plants and Rhisobium, are essential (l), but attempts to separate the components have been unsuccessful. Unequivocal fixation by the intact nodule excised from a plant actively fixing nitrogen has not been demonstrated. Ordinarily, cells o...
متن کاملInitial stages in the morphogenesis of nitrogen-fixing stem nodules of Sesbania rostrata.
Morphogenesis of stem nodules in Sesbania rostrata was studied over a period of 6 days after inoculation with an appropriate species of Rhizobium. Nodulation sites were initially slightly raised, circular areas 0.3 to 0.6 mm in diameter and 4 to 5 mm apart in vertical rows along the length of the stem. Each site was underlaid by an adventitious root primordium. A site became susceptible to infe...
متن کاملThe current and potential contribution of asymbiotic nitrogen fixation to nitrogen requirements on farms: a review
Significant levels of biological nitrogen fixation from sources other than nodulated legumes have become a tantalizing prospect for decades. Since the benefit to agriculture of nitrogen fixation from nodulated legumes was established, there have been widespread efforts to promote the use of various asymbiotic diazotrophic bacteria to fix extra nitrogen in soil. Despite much optimism by scientis...
متن کاملLegume Haemoglobins: Symbiotic Nitrogen Fixation Needs Bloody Nodules
How do plants create an environment in which symbiotic bacteria can reduce enough N2 to provide the plant with sufficient ammonium for growth? Gene silencing has now been used to show that legume haemoglobins are crucial.
متن کاملNitrogen fixation in pure culture by rhzobia isolated from stem nodules of tropical Aeschynomene species
Asymbiotic nitrogenase activity was investigated in rhizobia strains isolated from stem and root nodules of several Aeschynomene species. All isolates from stem-nodulating species were able to develop nitrogenase activity ex planta in the presence or in the absence of combined nitrogen, whereas root isolates from Aeschynomene species related to the cowpea group of plants showed little or no act...
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ژورنال
عنوان ژورنال: Soil Science and Plant Nutrition
سال: 1992
ISSN: 0038-0768,1747-0765
DOI: 10.1080/00380768.1992.10416711