منابع مشابه
Nitrogen fixation in grasses - gluconacetobacter activates genes in sugarcane
Nitrogen-fixing bacteria have been isolated from sugarcane (Saccharum spp.) and other grasses in an endophytic and beneficial interaction that promotes plant growth. In this interaction, bacteria colonize the intercellular spaces and vascular tissues of most plant organs without causing disease symptoms. The best characterized sugarcane endophytic diazotrophs are Gluconacetobacter diazotrophicu...
متن کاملClustering of nitrogen fixation (nif) genes in Rhizobium meliloti.
A cloned 17.3-kilobase region of the Rhizobium meliloti genome with homology to the Klebsiella pneumoniae nitrogenase structural genes was studied. Limits on the extent of homology were determined. Transposon mutagenesis of this region of the genome verified that it contained functional nif genes, Some transposon insertions resulted in a defective symbiotic phenotype, whereas others had no noti...
متن کاملAnaerobic regulation of nitrogen-fixation genes in Rhodopseudomonas capsulata.
A Rhodopseudomonas capsulata nifH::lacZ gene fusion was used to isolate constitutive mutants of R. capsulata, unable to repress nif gene transcription anaerobically with every fixed-nitrogen source tested. When these nifc strains were grown aerobically, nif gene transcription was repressed. These results indicate that the regulation of nif gene transcription by fixed nitrogen is different from ...
متن کاملTransduction of the nitrogen-fixation genes in Klebsiella pneumoniae.
The bacteriophage P1 infects and functions as a generalized transducing phage for nitrogen-fixing strains of the coliform bacterium Klebsiella pneumoniae. Bacterial mutants (nif(-)) unable to grow on molecular nitrogen as a nitrogen source were found to be deficient in nitrogenase activity as assayed by the conversion of acetylene to ethylene. These mutants regained normal nitrogenase activity ...
متن کاملNitrogen Fixation
Plant growth is directly dependent upon an adequate supply of fixed nitrogen. Water and fixed nitrogen are the most common limiting factors for plant growth.There is an abundance of nitrogen in the atmosphere, but it is in the form of the relatively inert gas, N2, and this must be converted chemically or biologically into a more active form before plants can utilize it. Chemical fixation most c...
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ژورنال
عنوان ژورنال: Nature
سال: 1976
ISSN: 0028-0836,1476-4687
DOI: 10.1038/260191a0