Plant Diversity ›› 2014, Vol. 36 ›› Issue (06): 698-706.doi: 10.7677/ynzwyj201414027

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Effects of Temperatures on Seed Germination Characteristics of Alpine Plant Stipa purpurea (Poaceae)*

 LI  Xiong-1、2、3, YIN  Xin-1、2、3, YANG  Shi-Hai-3、4, YANG  Yun-Qiang-1、2、3, HU  Xiang-Yang-1、2, YANG  Yong-Ping-1、2   

  1. 1 Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; 2 Germplasm Bank of Wild Species in Southwest of China, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China; 3 University of Chinese Academy of Sciences, Beijing 100049, China; 4 Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China
  • Received:2014-02-14 Online:2014-11-25 Published:2014-06-03
  • Supported by:

    国家重点基础研究发展计划项目 (2010CB951704) 和国家自然基金面上项目 (41271058)

Abstract:

Temperature is an important factor to impact seed germination. Under the background of climate warming and grassland degradation, it includes great value to understand temperature change on seed germination of Stipa purpurea. In the present study, six constant temperature conditions (5, 10, 15, 20, 25, and 30℃) and three variable temperature conditions (5/15, 10/20, and 15/25℃) were set to systematically detect the effects of temperatures on seed germination characteristics of Stipa purpurea from three different populations. The results showed that the more suitable seed germination temperature of Spurpurea ranged from 15 to 25℃, and temperatures lower than 10℃ or higher than 30℃ would not be conducive to seed germination. Compared to the corresponding constant temperatures, variable temperature conditions had no effects on promoting seed germination of Spurpurea. Seed germination characteristics of Spurpurea from different populations responded to temperature change with both same and different points. Correlation analysis revealed that altitude showed highly significant negative correlation with the germination rate, whereas soil temperature of seed germination seasons in the field had significant negative correlation with seed germination delay. This study will provide a scientific basis for reasonable protection and restoration of Spurpurea meadow.

Key words: Stipa purpurea, Alpine steppe, Grow grass artificially, Temperature, Seed germination

CLC Number: 

  • Q 948