Phorate-resistant mutant strains of chick pea (Cicer arietinumL.)Rhizobiumsp. growth and their compatibility in symbiotic nitrogen fixation

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Abstract
SUMMARY: Chick peaRhizobiumstrain RG3 was treated with 30 μg/ml of N-nitrosoguanidine and two mutants isolated were resistant to 2000 μg phorate/ml yet retained the capacity to form nodules. On the basis of number of nodules, their dry weight, N2ase activity, total pyridine nucleotides and active iron contents, mutant strains G11 and G26 were found to be equally effective with and without phorate and resulted in significantly greater grain yield.