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- W954308379 abstract "Biological nitrogen fixation is the cleanest and the most economical nitrogen fertilizer because it can reduce the environmental pollution and save energy.Endophytic nitrogen-fixing bacteria,living in plants,can avoid being inhibited by nitrogen compounds and the competition with indigenous microorganisms,showing a higher efficiency of nitrogen fixation.Endophytic nitrogen-fixing bacteria have great potentials to settle the problem of nitrogen sources of the host plants and enhance the adaptability to the environment.Now,more than 20 genera endophytic nitrogen-fixing bacteria have been found from the economic crops and tropical plants,but few studies on the alpine grassland Polygonum viviparum endophytic nitrogen-fixing bacteria are reported.In this study,endogenous nitrogen-fixing bacteria were isolated,screened and identified from Polygonum viviparum which are advantageous plants in alpine grassland in the Eastern Qilian Mountains.14 endophytic bacteria were isolated from Polygonum viviparum,and 7 of them have the ability of nitrogen-fixing.Z22 has been logged in the Gene Bank and has an accession number of EU693342 after PCR amplification,sequencing and phylogenetic analysis on nitrogen-fixing genes(nifH) Z22.Z22 is spherical,Gram-positive,and produces spore.Both 16SrDNA sequence homology analysis and physiological biochemical characteristics analysis indicated that Z22 can be identified as Bacillus sphaericus.16SrDNA sequence of Z22 has got a Gene Bank accession number of EU236749.It is the first time that gene sequence of nifH of encoding ferritin of Bacillus sphaericus was gained." @default.
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- W954308379 date "2009-01-01" @default.
- W954308379 modified "2023-09-28" @default.
- W954308379 title "Identification of endogenous nitrogen-fixing bacteria of Polygonum viviparum and analysis on nitrogen fixation gene(nifH)" @default.
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