The ecological significance of pubescence in Saussurea medusa, a high-elevation Himalayan "woolly plant"
Yang, Yang2,3; Koerner, Christian1; Sun, Hang2
2008-02-01
发表期刊ARCTIC ANTARCTIC AND ALPINE RESEARCH
ISSN1523-0430
卷号40期号:1页码:250-255
摘要

Several members of the vascular plant genus Saussurea, which are found at elevations exceeding 5000 in, have dense layers of woolly trichomes on their leaves, bracts, and inflorescences, the function of which is not fully understood. Here we explore the thermal benefits of pubescence in Saussurea medusa, both in situ in the Chinese Hengduan Mountains and under controlled conditions. Mean daytime inflorescence temperature was 5.9 K above air temperature. Pubescence removal revealed that most of this warming is not related to pubescence but to radiant warming of the compact inflorescence itself (4.1 K warming in shaved plants, i.e. 1.8 K less). The effect of pubescence on nighttime radiative cooling was negligible. Our data indicated that the functional role of pubescence in these high-elevation plants cannot be attributed solely to producing warming tissues, but may also include other functions such as water repellency and reflection of short peaks of high radiation. These other functions must be specific to a small group of species, given that most other high elevation taxa do not exhibit this woolly character.

关键词Leaf Surface Wetness Flower Heliotropism Desert Shrub Temperature Heat Hairs Inflorescences Visitation Evolution Patterns
收录类别SCI
语种英语
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文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/2793
专题中国科学院东亚植物多样性与生物地理学重点实验室
作者单位1.Univ Basel, Inst Bot, CH-4056 Basel, Switzerland
2.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Kunming 650204, Yunnan, Peoples R China
3.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
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Yang, Yang,Koerner, Christian,Sun, Hang. The ecological significance of pubescence in Saussurea medusa, a high-elevation Himalayan "woolly plant"[J]. ARCTIC ANTARCTIC AND ALPINE RESEARCH,2008,40(1):250-255.
APA Yang, Yang,Koerner, Christian,&Sun, Hang.(2008).The ecological significance of pubescence in Saussurea medusa, a high-elevation Himalayan "woolly plant".ARCTIC ANTARCTIC AND ALPINE RESEARCH,40(1),250-255.
MLA Yang, Yang,et al."The ecological significance of pubescence in Saussurea medusa, a high-elevation Himalayan "woolly plant"".ARCTIC ANTARCTIC AND ALPINE RESEARCH 40.1(2008):250-255.
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