Abstract
The present study deals with certain basic characteristics of sex differentiation in a long-day cucumber variety“Higan-fushinari.”Far-red light irradiation at the onset of dark period inhibited the male flower differentiation when the day-length was given at 9 hours. Male flower nodes were produced most frequently in ca. 8 hours photoperiod. Not only in the still longer photoperiods but also in the shorter ones than 8 hours the male flower nodes decreased in their number and the female flower nodes increased in turn. The female flower nodes showed an increase in number with the intensity of supplemental light during the main light period and that of supplemental light, and at that of less than 5lux there appeared no effect of supplemental light on the female flower differentiation. Eight hours of daily supplemental light could produce much more female flower nodes than 4 hours one. Supplemental illumination with red light was most effective for the female flower differentiation.
