中国石蒜叶片的生长周期及其发育过程的研究.pdfVIP

植物学通报 2005, 22 (6): 680~686 Chinese Bulletin of Botany 实验简报 中国石蒜叶片的生长周期及其发育过程的研究① 李爱荣 周 坚② (南京林业大学森林资源与环境学院 南京 210037 ) 摘要 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(Lycoris chinensis ) 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。 关键词 中国石蒜, 叶片, 生长周期, 发育 Study of the Growth Cycle and Development of Lycoris chinensis Leaves LI Ai-Rong ZHOU Jian② (College of Forest Resources and Environment, Nanjing Forestry University , Nanjing 210037) Abstract 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 scan- ning 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 inte- grated leaf appears. Key words Lycoris chinensis, Leaf, Growth cycle, Development 中国石蒜(Lycoris chinensis ) 为石蒜科 花期7~8 月。石蒜属植物在全世界约有20 余 (Amaryllidaceae)石蒜属(Lycoris )多年生草本 种, 主产我国和日本。我国约有17 种(含1 变 植物, 具地下鳞茎; 春季出叶, 叶带状; 花黄色, 种)(王仁师, 1990) , 主要分布于长江以南, 尤以 ①国家科技部863 项目(2002AA241051) 资助。 ②通讯作者。Author for correspondence. E-mail:zjian@public1.ptt.js.cn 收稿日期: 2005-01-19 接受日期: 2005-05-26 责任编辑: 孙冬花 2005 李爱荣等: 中国石蒜叶片的生长周期及其发育过程的研究