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The present study was planned to determine the herbicide tolerance Rhizobium species were
selected from three different leguminous plants namely Arachis hypogaea L, Vigna mungo L., and
Vigna radiate L. Herbicides such as Atrazine, Paraquat Dichloride and Pendimethalin were
used for this purpose in the concentrations such as .0.1, 0.2, 0.3%. Rhizobium species are
designated R1, R2 and R3 viz, Groundnut, Black gram and Green gram. R1 isolates from
groundnut leguminous plants were showed that better performance on Pendimethalin than
compared to Atrazine and Paraquat Dichloride. Pendimethalinwas showed zone of inhibition at
0.1% level. The efficient improved Rhizobium isolates from groundnut are subjected to again
herbicide tolerance, and the results are same like that, when the herbicides concentrations
was increased maximum zone of inhibition was noticed. Overall results are highlighted that
R1 (Arachis hypgaea L.,) isolates had a adverse effect on the Pendimethalin at 0.3 % level was
safer to Rhizobia.. If Rhizobial strains show sensitivity to herbicides, herbicide-resistant
strains need to be developed. Further study was extended to test effect herbicides under field
conditions on the growth of Rhizobia.
Keywords: Rhizobium, Herbicide, Leguminous plants and strain improvement.