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Strain-specific salt tolerance and chemotaxis of Azospirillum brasilense and their associative N-fixation with finger millet in saline calcareous soil

R. RAI
Plant and Soil
Vol. 137, No. 1, Selected papers from the PROCEEDINGS OF THE FIFTH INTERNATIONAL SYMPOSIUM ON NITROGEN FIXATION WITH NON-LEGUMES (November (I), 1991), pp. 55-59
Published by: Springer
Stable URL: http://www.jstor.org/stable/42937167
Page Count: 5
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Strain-specific salt tolerance and chemotaxis of Azospirillum brasilense and their associative N-fixation with finger millet in saline calcareous soil
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Abstract

Three salt-tolerant Azospirillum brasilense strains were isolated from the roots of finger millet grown in saline calcareous soil and characterized. The effect of various salts on growth and N₂ ase activity of these strains was tested and strain STR1 was found more tolerant at higher concentrations of Cl⁻, $SO_4^{2 - }$ and $HCO_3^ - $ Bicarbonate was found to be the most toxic. The content and concentrations of root exudates of finger millet genotypes were different and chemotaxis to sugars, amino acids, organic acids and root exudates was strain specific. Under salt stress, significant interactions between strains and genotypes of finger millet resulted in different responses of N₂ ase activity, endo-and exorhizospheric population, dry weight of root, shoot and grain yield.

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