Inhibition of Ethylene Production by Cobaltous Ion

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Abstract
The effect of Co2+ on ethylene production by mung bean (Phaseolus aureus Roxb.) and by apple tissues was studied. Co2+, depending on concentrations applied, effectively inhibited ethylene production by both tissues. It also strongly inhibited the ethylene production induced by IAA, kinetin, IAA plus kinetin, Ca2+, kinetin plus Ca2+, or Cu2+ treatments in mung bean hypocotyl segments. While Co2+ greatly inhibited ethylene production, it had little effect on the respiration of apple tissue, indicating that Co2+ does not exert its inhibitory effect as a general metabolic inhibitor. Ni2+, which belongs to the same group as Co2+ in the periodic table, also markedly curtailed both the basal and the induced ethylene production by apple and mung bean hypocotyl tissues.