期刊
ARCTIC ANTARCTIC AND ALPINE RESEARCH
卷 41, 期 4, 页码 515-521出版社
TAYLOR & FRANCIS LTD
DOI: 10.1657/1938-4246-41.4.515
关键词
-
资金
- Yunnan Natural Science Foundation [2008CC013]
- Natural Science Foundation of China [30625004, 40930209, 30900084]
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.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据