Abstract
Ethephon, one of the chemicals releasing ethylene, induced flower bud blasting of a Cymbidium hybrid (C. ×Sazanami 'Haru-no-umi') regardless of the stage of flower buds. Both silver-thiosulphate (STS) and gibberellic acid (GA3) overcame the inhibition of flower bud development induced by high temperatures. There was, however, a distinct difference in the action between these chemicals. The stimulation of flower bud development by STS remained after subsequent applications of ethephon; that of GA3 was nullified by ethephon. Furthermore, inflorescences treated with STS evolved more ethylene than did the control, whereas inflorescences treated with GA3 evolved less ethylene than did the control. These results indicate that STS and GA3 function as inhibitors of ethylene action and ethylene synthesis, respectively. They also indicate that ethylene is involved in high temperature-induced blasting of Cymbidium flower buds.
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