15N2 incorporation and acetylene reduction by Azospirillum isolated from rice roots and soils |
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| Authors: | D N Nayak P B B N Charyulu V Rajaramamohan Rao |
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| Institution: | (1) Laboratory of Soil Microbiology, Central Rice Research Institute, 753006 Cuttack, India |
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| Abstract: | Summary Nitrogen fixation by strains of Azospirillum isolated from several rice soils and rice cultivars was investigated by15N2 incorporation and C2H2 reduction. C2H2 reducing ability markedly varied among the strains obtained from soils differing widely in their physico-chemical properties. Large variations in15N2 incorporation by Azospirillum isolated from the roots of several rice cultivars were also noticed. The present study reveals that rice cultivars harbour Azospirillum with differential N2-fixing ability and that plant genotype is of importance for optimal associations. |
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| Keywords: | Acetylene reduction Azospirillum 15N2 incorporation Rice cultivar |
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