The sterility of barley frequently encountered here in Japan has been studied.
1) Sterility is closely related to weather conditions: it occurs when anthesis takes place on a humid day preceded by several days of warm weather.
2) Sterility is correlated with inferiority of emergence at the time of anthesis.
3) Growth curves of vegetative organs consist of four lines connected at three points, which correspond to the periods of sporogenesis, gametogenesis and zygogenesis-the very important periods of growth phenomena in the sexual physiology. It thus indicates that the sexual organ should play an important role to control the growth of all organs.
4) Experimental attemperation (15-16°C) of the spike at and after the meiotic stage resulted in inferior emergence.
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