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

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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

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

CLC Number: 

  • Q 948