Ecology, Environment and Conservation Paper

Vol.15, Issue 02, 2009; Page No.(273-275)

RHIZOBIUM LEGUMINOSARUM AND THEIR NODULATION ABILITY ON ARACHIS HYPOGEA UNDER SALT STRESS

S. Ahmed John and S. Vimaia Ciandhi

Abstract

Survival, growth and symbiotic performance of rhizobia isolated from saline soil in Tamil Nadu. 30 isolates out of 43 Arachis hypogea plants were obtained and 22 strains were characterized. Majority of the strains of the bacteria do not survive in the high salt concentration of 500mM Nacl however 350mM Nacl all the strains were survived in the soil. In order to investigate the ability of salt stress on the Rhizobium —Arachis hypogea Symbiosis. At the Rhizobium level, Rhizobium leguminosarum was found for their salt tolerance up to 350mM Nacl.The nodule number, nodule weight, plant shoot and root were moderately affected by mild levels of Nacl (25mM and 50mM). Rhizobia were found to possess greater tolerance for salinity than their host legumes.

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