Synergistic effect of calcium and kinetin on ethylene production by the mungbean hypocotyl.

A slight increase in ethylene production resulted from the application of either kinetin or Ca(2+) to mungbean (Phaseolus mungo L.) hypocotyl segments, but a remarkable synergistic increase in C2H4 production was observed when they were applied together. The induction time was about 6 h as compared to 1 h for auxin-induced C2H4 production. A slight stimulation of C2H4 production was also observed when Ca(2+) was applied with abscisic acid, but no synergistic effect of Ca(2+) was observed with indole-3-acetic acid or GA3.