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Plant Diversity ›› 2013, Vol. 35 ›› Issue (3): 303-309.DOI: 10.7677/ynzwyj201313036

• 研究论文 • 上一篇    下一篇

珍稀濒危植物距瓣尾囊草种子散布及萌发特性

 张云香, 胡灏禹, 杨丽娟, 王长宝, 何兴金   

  1. 四川大学生命科学学院 生物资源与环境教育部重点实验室，四川 成都610064
  • 收稿日期:2013-03-14 出版日期:2013-05-25 发布日期:2013-04-11
  • 基金资助:

    科技部科技基础性工作专项重点项目 (2007FY110100)；国家自然科学基金资助项目 (31100161, 31070166)；国家基础条件平台教学标本平台 (http://mnh.scu.edu.cn/) 资助

Seed Dispersal and Germination of an Endangered and Rare Species Urophysa rockii (Ranunculaceae)

 ZHANG  Yun-Xiang, HU  Hao-Yu, YANG  Li-Juan, WANG  Chang-Bao, HE  Xing-Jin   

  1. Key Laboratory of BioResources and EcoEnvironment of Ministry of Education, College of
    Life Science, Sichuan University, Chengdu 610064, China
  • Received:2013-03-14 Online:2013-05-25 Published:2013-04-11
  • Supported by:

    科技部科技基础性工作专项重点项目 (2007FY110100)；国家自然科学基金资助项目 (31100161, 31070166)；国家基础条件平台教学标本平台 (http://mnh.scu.edu.cn/) 资助

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摘要：

采用野外调查和室内实验相结合的方法，对距瓣尾囊草（Urophysa rockii）种子散布途径、散布方式和种子萌发特性进行初步研究。结果表明：距瓣尾囊草种子千粒重为0.6684±0.0038g，以果实和种子为扩散单元进行扩散，具有自体扩散和水媒扩散两种方式。温度对距瓣尾囊草种子萌发有显著影响，20℃为最适萌发温度，发芽率达67.78%。低温（4℃）层积可有效提高种子发芽率和发芽势，随层积天数增加，发芽率和发芽势增加，但层积30d和40d发芽率和发芽势无显著性差异。光照和黑暗对种子萌发的影响差异不显著，光照不是其种子萌发的必需条件。实验证明，与用湿砂做发芽基质相比，用滤纸做发芽基质，其发芽率和发芽势均比前者高，因此滤纸是距瓣尾囊草种子萌发实验中更为适宜的发芽基质。

关键词: 距瓣尾囊草, 扩散单元, 扩散方式, 种子萌发, 温度, 低温层积

Abstract:

The dispersal characteristics and dispersal way of seeds and the biological characteristics of seed germination of Urophysa rockii were investigated in this paper. Our finds showed that the 1000seed weight of the seed was 0.6684±0.0038g. Dispersal units of the species comprise fruits and seeds. Moreover, both autochory and hydrochory are included. The optimum temperature for germination of U.rockii was 20℃, and the germination on 20℃ could be as high as 67.78%. Cold stratification could significantly increase seed germination percentage and germination energy; the longer the duration of cold stratification, the higher the germination percentage. However, this effect did not work significantly if the duration was longer than 30 days. Compared with darkness, light couldn’t increase seed germination percentage, so light was not indispensable for germination of U.rockii. We also confirmed that there were great differences for germination percentage and germination energy between two different germination media. The percentages of germination and germination energy on filter paper were 73.33% and 45% respectively, but 50% and 18.33% on wet sand. The result showed that the filter paper was a better germination media for U.rockii seed germination than wet sand.

Key words: Urophysa rockii, Dispersal unit, Dispersal mode, Seed germination, Temperature, Cold stratification

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