1植物的光周期现象及类型大量实验证明,许多植物的开花与昼夜的相对长度即光周期有关。植物在生长发育进程中,必须经过一定时间的适宜光周期后才能开花,否则一直处于营养生长状态。这种昼夜长短影响植物开花的效应叫做光周期现象。根据植物开花对光周期的不同反应,可将植物分为三种类型。 1 Plant photoperiod phenomena and types A large number of experiments show that the flowering of many plants and the relative length of day and night that the photoperiod-related. Plants in the process of growth and development, after a certain period of time before the appropriate photoperiod to flowering, or has been in vegetative growth. This effect of day and night affecting plant flowering is called photoperiod. Plants are divided into three types based on the different responses of plants to the photoperiod.