LIGHT- AND DARK-GROWTH IN LONG-DAY DUCKWEED, LEMNA GIBBA G3, AS AFFECTED BY KINETIN

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Under short-day conditions the growth or the production of Σ fronds in Lemna gibba G3 was stimulated by KIN (10^<-5>M); the longer the nyctoperiod,the greater the stimulation was. Under long-day conditions KIN was slightly inhibitory for the first 2 days, but promotive there-after. IAA (10^<-5>M) reversed the growth inhibition by KIN in long-days, and DCA (10^<-4> to 10^<-6>M) and also CA (10^<-4> to 10^<-6>M), although less effectively, cancelled the growth promotion by KIN in short-days. DCA (10^<-5>M) little altered the KIN inhibition in the first 2 days of light culture, nevertheless it alleviated strikingly the KIN promotion in the subsequent illuminated days. These and relevant findings explained the above-described promotion and inhibition by KIN of the duckweed growth in terms of in vivo level of a cofactor (probably auxin) which may be under the regulative influence of photoperiodic conditions given. Moreover, some bearing of the above conclusion on flowering mechanism in this long-day duck-weed was suggested.
日本植物生理学会の論文