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题名: Comparing the relationship between seed germination and temperature for Stipa species on the Tibetan Plateau
作者: Yang, Shihai1, 2; Li X(李雄)3, 4, 5; Yang, Yunqiang3, 4, 5; Yin, Xin3, 4, 5; Yang Yongping(杨永平)1, 3, 4, 5
刊名: BOTANY
关键词: alpine steppe ; seed germination ; cardinal temperature ; thermal time ; Stipa species ; Tibetan Plateau
英文摘要: Alpine steppe grasslands dominated by Stipa species (Poaceae) on the Tibetan Plateau are important model ecosystems. Here, we present data on seed germination of three typical Stipa species (Stipa purpurea Griseb., Stipa glareosa P.A. Smirn., and Stipa capillacea Keng) from the northern core region of the Tibetan Plateau. We carried out laboratory investigations of germination behavior under both constant and alternating temperatures. Germination varied significantly with temperature. Under constant temperature, we found that temperature and species, but not their interaction, had significant effects on seed germination. Under alternating temperatures, species had a significant effect on seed germination, whereas the effects of alternating temperature and the interaction between species and alternating temperature were not significant. In addition, light and the interaction of light and species had no significant effect on seed germination; however, species had a significant effect, implying that Stipa species on the Tibetan Plateau are not inhibited by light. Base temperatures of S. glareosa, S. purpurea, and S. capillacea were 1.0 degrees C, 0.1 degrees C, and -1.4 degrees C, respectively, with corresponding thermal times at suboptimal temperatures of 233 degrees C-day, 154 degrees C-day, and 263.2 degrees C-day. Our results suggest that Stipa seed germination characteristics are adaptions to a harsh environment and are species-specific.
出版日期: 2014-12-01
卷号: 92, 期号:12, 页码:895-900
语种: 英语
收录类别: SCI
学科分类: Plant Sciences
ISSN号: 1916-2790
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/18492
Appears in Collections:资源植物与生物技术所级重点实验室_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Tibetan Plateau Res, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Grad Univ, Beijing 100049, Peoples R China
3.Chinese Acad Sci, Key Lab Plant Divers & Biogeog East Asia, Kunming 650204, Peoples R China
4.Chinese Acad Sci, Kunming Inst Bot, Plant Germplasm & Genome Ctr, Germplasm Bank Wild Species, Kunming 650204, Peoples R China
5.Chinese Acad Sci, Inst Tibetan Plateau Res Kunming, Kunming Inst Bot, Kunming 650204, Peoples R China
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