カーネーションの切り花の老化の過程における花弁中の1-アミノシクロプロバン-1-カルボン酸(ACC)合成酵素の活性の誘導, ACC含量, エチレン生成量の増大に及ぼす2,5-ノルボルナジエンとエチレンの影響

Abstract

A marked increase in ethylene production occurred in cut carnation flowers (Dianthus caryophyllus L. cv. Izu-Pink) during senescence. The application of ethylene hastened senescence by promoting ethylene production, while the applied 2, 5-norbornadiene (NBD) retarded the progress of senescence of flowers by reducing the rate of ethylene production, such that no initiation of wilting of flowers was observed 8d after harvest when untreated flowers had completely wilted. Most of the ethylene produced by senescing carnation flowers was derived from petals.The activity of 1-aminocyclopropane-1-carboxylate (ACC) synthase was markedly induced in petals of carnation flowers during senescence, and was accompanied by increases in the level of ACC and the rate of ethylene production. This induction was promoted by ethylene and suppressed by NBD. It is considered that ethylene accelerates ethylene biosynthesis by promoting the induction of ACC synthase, while NBD reduces ethylene biosynthesis by suppressing the induction of ACC synthase, which may result from inhibition of ethylene action by NBD.