Abstract
SUMMARYReciprocal root: shoot grafts of Vigna angularis, Vigna mungo, Vigna radiata and Vigna umbellata were used to study the effects of root and shoot genotype and Rhizobium strain on growth, nodulation and nitrogen uptake of plants grown with nitrogen‐free nutrient solution in sand culture.There were large and significant effects of root genotype, shoot genotype and Rhizobium strain on plant and nodule characters. Interaction effects were invariably small.Effects of both shoot and root genotype on total nodule activity and nitrogen fixation appeared to be due to effects on nodule fresh wt, while those of Rhizobium strain were associated primarily with specific nodule activity. It is suggested that shoot genotype differences in nodule fresh wt arose because of differences in leaf area. Some implications for genetic manipulation of the symbiosis in the Vigna species are discussed.
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