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¹⁵N₂ INCORPORATION AND ACETYLENE REDUCTION BY AZOSPIRILLUM ISOLATED FROM RICE ROOTS AND SOILS

D. N. NAYAK, P. B. B. N. CHARYULU and V. RAJARAMAMOHAN RAO
Plant and Soil
Vol. 61, No. 3 (1981), pp. 429-436
Published by: Springer
Stable URL: http://www.jstor.org/stable/42935376
Page Count: 8
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¹⁵N₂ INCORPORATION AND ACETYLENE REDUCTION BY AZOSPIRILLUM ISOLATED FROM RICE ROOTS AND SOILS
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Abstract

Nitrogen fixation by strains of Azospirillum isolated from several rice soils and rice cultivars was investigated by ¹⁵N₂ incorporation and C₂H₂ reduction. C₂H₂ reducing ability markedly varied among the strains obtained from soils differing widely in their physico-chemical properties. Large variations in ¹⁵N₂ 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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