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Interaction of Kinetin and Calcium in Relation to Their Effect on Stimulation of Ethylene Production ¹

^a Department of Vegetable Crops, University of California, Davis, California 95616

Application of kinetin and Ca²⁺ caused a striking synergistic increase in ethylene production by mung bean (Phaseolus aureus Roxb) hypocotyl segments. The effect of kinetin on Ca²⁺ uptake and of Ca²⁺ on the uptake and metabolism of kinetin in relation to their effect on ethylene production was studied. Tracer experiments showed that kinetin greatly increased the uptake of ⁴⁵Ca²⁺ after 6 hours of incubation. Reciprocally, Ca²⁺ stimulated the uptake of kinetin-8-¹⁴C and remarkably enhanced the metabolism of kinetin-8-¹⁴C into several polar metabolites. Consequently, the quantity of free kinetin-8-¹⁴C remaining in Ca²⁺-treated segments was much less than in control segments. A possible mechanism accounting for the synergism between kinetin and calcium on ethylene production is discussed.

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