Effect of root extract on nodulation of cowpea

Abstract

This work studied the effects of root extract on nodulation of cowpea (Vigna unguiculata (L.) Walp.) in the greenhouse. Two strains of Bradyrhizobium (MAC-2 and RBGm-28) were pre-tested with the extracts of cowpea roots, and their symbiotic performances were analysed. In the association cowpea/RBGm-28, the root extract influenced significantly some of the stages of the symbiotic process. In that case a decrease in the number of nodules formed and in nodule dry weights was observed. The time of inoculum culturing influenced significantly the dry weight and the plant leaf area.