The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China
Yang, Yang1,2; Sun, Hang1
2009-11-01
发表期刊ARCTIC ANTARCTIC AND ALPINE RESEARCH
ISSN1523-0430
卷号41期号:4页码:515-521
摘要Several members of the subgenus Amphilaena (Saussurea; Asteraceae) growing at high elevations in the Himalayan region have semi-translucent bracts covering their inflorescences, the function of which is not fully understood. We investigated the thermal benefits of these bracts in Saussurea velutina in situ in the Hengduan Mountains, SW China, and compared the reflectance spectra and anatomical characters of bracts and rosette leaves in the laboratory. After removal of bracts in the field the average inflorescence daytime temperature was 2.5 degrees C colder than in control plants with intact bracts. Manually opened treatment inflorescences grew slower and set significantly fewer seeds than control inflorescences with bracts intact. The mesophyll of bracts is a single cell layer with a lower reflectance in the infrared range than rosette leaves. We show that the semi-translucent bracts in S. velutina function to ensure warmer temperatures for floral and seed development at high elevations in the Hengduan Mountains.
关键词Nobile Hook-f Ecological Significance Thomson Polygonaceae Translucent Bracts Glasshouse Plant Lobelia-telekii Temperature Alpine Pubescence Leaf
资助信息Yunnan Natural Science Foundation [2008CC013]; Natural Science Foundation of China [30625004, 40930209, 30900084]
学科领域Environmental Sciences ; Geography, Physical
DOI10.1657/1938-4246-41.4.515
收录类别SCI
语种英语
WOS研究方向Environmental Sciences & Ecology ; Physical Geography
WOS类目Environmental Sciences ; Geography, Physical
WOS记录号WOS:000272503400013
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被引频次:11[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.kib.ac.cn/handle/151853/3291
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.Chinese Acad Sci, Kunming Inst Bot, Key Lab Biodivers & Biogeog, Yunnan 650204, Peoples R China
2.Chinese Acad Sci, Grad Sch, Beijing 100039, Peoples R China
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Yang, Yang,Sun, Hang. The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China[J]. ARCTIC ANTARCTIC AND ALPINE RESEARCH,2009,41(4):515-521.
APA Yang, Yang,&Sun, Hang.(2009).The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China.ARCTIC ANTARCTIC AND ALPINE RESEARCH,41(4),515-521.
MLA Yang, Yang,et al."The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China".ARCTIC ANTARCTIC AND ALPINE RESEARCH 41.4(2009):515-521.
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