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玉米从出苗至开花的天数及总叶片数的短日照光周期效应早已为人们所熟知(Kiesse-lbach,1950)。叶片是在出苗至抽雄期间有规律地产生于顶端生长点附近的。经过一段不敏感的幼苗期后,玉米才对光周期产生直接的效应,并在雄穗开始形成时结束(Kininy 等,1983a,)。大多数玉米品种对光周期敏感的阶段随着光周期的延长而延长,从而导致雄穗
The short-day photoperiod effect of maize days from emergence to flowering and the total number of leaves has long been known (Kiesse-lbach, 1950). The leaves are regularly generated near the top growing point during emergence to tasseling. After a period of insensitive seedling, corn has a direct effect on the photoperiod and ends when the tassel begins to form (Kininy et al., 1983a). Most of the maize varieties are sensitive to the photoperiod stage with the extension of the photoperiod, which leads to tassel