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题名: The Bracts of Saussurea velutina (Asteraceae) Protect Inflorescences from Fluctuating Weather at High Elevations of the Hengduan Mountains, Southwestern China
作者: Yang, Yang1, 2; Sun Hang(孙航)1
刊名: ARCTIC ANTARCTIC AND ALPINE RESEARCH
关键词: NOBILE HOOK-F ; ECOLOGICAL SIGNIFICANCE ; THOMSON POLYGONACEAE ; TRANSLUCENT BRACTS ; GLASSHOUSE PLANT ; LOBELIA-TELEKII ; TEMPERATURE ; ALPINE ; PUBESCENCE ; LEAF
英文摘要: 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.
出版日期: 2009-11-01
卷号: 41, 期号:4, 页码:515-521
DOI标识: 10.1657/1938-4246-41.4.515
语种: 英语
ISSN号: 1523-0430
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.kib.ac.cn/handle/151853/3291
Appears in Collections:中国科学院东亚植物多样性与生物地理学重点实验室_期刊论文

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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

Recommended Citation:
Yang, Y; Sun, H.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,2009,41(4):515-521
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