光周期的暗期长度是决定植物成花的决定因素。
The darkness length in photoperiod is the crucial factor determining the formation of plant flowers.
但是，两组光周期被打乱的老龄雄鼠的死亡率则高多了。
But the number of deaths in the two groups whose day-and-night cycles had been tampered with was far higher.
研究最彻底的是不同的光周期对高生长停止，萌芽和进入休眠的时间的效应。
Best studied are the effects of differing photoperiods on The Times of height growth cessation, bud formation and dormancy onset.
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