Influence of Penicillin on Nodulation and Nitrogen Fixation in Mungbean in Relation to some Nitrogen Assimilating Enzymes

Nodule number and size, nitrogen content of noddles and the nitrogenase activity, showed variable degree of stimulation under, 200 and 400 mg dm⁻³ penicillin treatments. The activities of GS, GDH, and GOGAT were highest at 100 mg dm⁻³ penicillin, while higher doses (200 and 400 mg dm⁻³ penicillin) seemed to be less effective. The increase in GS, GDH and GOGAT by 100 mg dm⁻³ penicillin was 15%, 65% and 29% respectively, over control.