Thermal insulation and accumulation of heat in the downy inflorescences of Saussurea medusa (Asteraceae) at high elevation in Yunnan, China

doi:10.1007/s10265-002-0030-1

	Thermal insulation and accumulation of heat in the downy inflorescences of Saussurea medusa (Asteraceae) at high elevation in Yunnan, China
	Tsukaya, H ; Fujikawa, K ; Wu, SG
	2002-08-01
发表期刊	JOURNAL OF PLANT RESEARCH
卷号	115 期号:1120 页码:263-268
摘要	Himalayan snowball plants. which are considered to be an extreme form of downy plants, have very dense trichomes on well-developed bracts that surround the inflorescences. It has been postulated that the downy inflorescences of these plants might serve to keep the interior of inflorescences warmer than the outside and, thus, to protect reproductive cells from low temperatures in their Himalayan habitat. In the present study, we examined the downy inflorescences of Saussurea medusa Maxim. in native habitats in the high alpine zone of the Henduan Mountains in Yunnan, China, and we analyzed the temperature within inflorescences after absorbance of light energy. S. medusa is pollinated by bumblebees and we found that its inflorescences accumulated heat not on the inside, but, rather, on the upper surfaces. The thick hollow stems and the overlapping bracts with obvious epinasty might serve not only to retain heat, but also as an insulator to protect the inside against overheating, with apparent local warming of flowers that are located at the tops of plants. which are cone-shaped. We made a model that mimicked the warming of inflorescences, providing support for the hypothesis that the downy bracts of S. medusa have two functions: thermal insulation to protect the inside of flowers and the accumulation of heat on the upper surfaces of the inflorescence. Such a system might be effective in attracting pollinators and also in protecting tissues from extreme variations in temperature.
关键词	Alpine Plants Downy Plants Heat Insulation Pollination Saussurea Thermography
DOI	10.1007/s10265-002-0030-1
收录类别	SCI
语种	英语
WOS记录号	WOS:000177383600003
引用统计
文献类型	期刊论文
条目标识符	http://ir.kib.ac.cn/handle/151853/23977
专题	植物化学与西部植物资源持续利用国家重点实验室
作者单位	1.Natl Inst Basic Biol, Ctr Integrat Biosci, Okazaki Natl Inst, Okazaki, Aichi 4448585, Japan 2.Grad Univ Adv Studies, Sch Adv Sci, Kanagawa, Japan 3.Univ Tokyo, Univ Museum, Tokyo, Japan 4.Chinese Acad Sci, Kunming Inst Bot, Kunming, Peoples R China
推荐引用方式 GB/T 7714	Tsukaya, H,Fujikawa, K,Wu, SG. Thermal insulation and accumulation of heat in the downy inflorescences of Saussurea medusa (Asteraceae) at high elevation in Yunnan, China[J]. JOURNAL OF PLANT RESEARCH,2002,115(1120):263-268.
APA	Tsukaya, H,Fujikawa, K,&Wu, SG.(2002).Thermal insulation and accumulation of heat in the downy inflorescences of Saussurea medusa (Asteraceae) at high elevation in Yunnan, China.JOURNAL OF PLANT RESEARCH,115(1120),263-268.
MLA	Tsukaya, H,et al."Thermal insulation and accumulation of heat in the downy inflorescences of Saussurea medusa (Asteraceae) at high elevation in Yunnan, China".JOURNAL OF PLANT RESEARCH 115.1120(2002):263-268.

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