Frond and flower production in Lemna gibba G3 in presence of respiratory inhibitors

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Effects of respiratory inhibitors on frond and flower production in light culture of a long-day duckweed, Lemna gibba G_3, were investigated. The inhibitors examined could be divided into 3 groups based on their specific actions: (A) 2,4-Dinitrophenol (10^<-4>M), arsenate (10^<-4>M), malonate (10^<-2>M), o-phenanthroline (10^<-6>M),α,α'-dipyridyl (10^<-5>M) and azide (10^<-6>M) inhibited flower production by suppressing the rate of flower production without affecting the induction period. Frond production, however, was promoted by these reagents. Effective time of application came one day after the end of the induction period. (B) Iodoacetate (10^<-6>M) and fluoride (10^<-4>M) inhibited both flower production and, less significantly, frond production. Reduced rate of flower production was responsible t~or the inhibition of flowering. Effective time of application preceded by one day that of A group inhibitors. (C) Salicylaldoxime (10^<-6>M), diethyldithiocarbamate (10^<-6>M) and 8-hydroxyquinoline (10^<-7>M) enhanced flower production by reducing the length of the induction period, and simultaneously slightly inhibited frond production. Effective time of application was the latter half of the induction period. The implications of these findings are discussed with special reference to the component processes involved in photoperiodic induction of flowering in duckweed.
日本植物生理学会の論文