中国石蒜叶片的生长周期及其发育过程的研究

Study of the Growth Cycle and Development of Lycoris chinensis Leaves

为了解石蒜属植物叶片的生长发育过程,本文研究了中国石蒜(Lycorischinensis)叶片的生长周期,并且通过石蜡切片法和扫描电镜法对叶片的形成过程进行了研究。结果发现:中国石蒜的叶片在3月底开始分化,9月分化结束,11月,幼叶生长停止,并于翌年2、3月露出地面,5月即枯萎,完成生活史;叶片的形成经历4个阶段,即叶原座形成时期、叶原基生长时期、带状叶片的形成以及叶鞘的形成时期;叶原基先形成带状叶片,随后在其基部两侧形成褶,进而闭合发育成叶鞘。至此,叶片分化过程结束。

To discover the leaf development of Lycoris, the growth cycle of L. chinensis leaf was observed, and the process of shaping was studied with use of the paraffin method and scanning electron microscopy. Leaves began to shape from the end of March until September, and the growth of young leaves terminated in November. In February or March of the next year, the leaves shot out of the ground. Finally, they withered in May. In addition, 4 phases exist in the process of leaf shaping （buttress forming, primordium, straplike leaf and sheath）. At first, the leaf primordium shapes the zonary leaf, and then the plaits are formed at the bilateral base of the zonary leaf. Finally, the plaits close and form sheaths. Thus, an integrated leaf appears.