期刊
BOTANICAL JOURNAL OF THE LINNEAN SOCIETY
卷 193, 期 4, 页码 431-477出版社
OXFORD UNIV PRESS
DOI: 10.1093/botlinnean/boaa027
关键词
Andes; climate; Colombia; delta C-13; epiphytes; Orchidaceae; photosynthetic pathway; WorldClim
资金
- Jose Celestino Mutis Botanical Garden in Bogota
- Semilla grant
- FAPA grant
- grant 'Convocatoria 2018-2019 para la Financiacion de Programas de Investigacion' from Universidad de los Andes [INV-2017-51-1435]
- National Science Foundation [DEB 1442199]
Many Orchidaceae, especially those occupying periodically dry, epiphytic microhabitats in the humid tropics, are believed to engage in the water-conserving crassulacean acid metabolism (CAM) photosynthetic pathway. However, the photosynthetic pathway has been studied in only c. 5% of all orchid species. Here we extend the survey to 1079 orchid species, mainly from Colombia, by assessing the presence of CAM based on the carbon isotopic signature (delta C-13 values) of herbarium specimens. Ninety-six species, representing 8.9% of those analysed, had delta C-13 values less negative than -20%, indicating CAM. Epiphytism was the predominant life form (75.2% of species sampled), and 9.4% of these epiphytes showed a CAM-type isotopic signature. Isotope values suggested CAM in 19 terrestrial orchid species, 14 species from high elevation (2000-3400 m) and species from six genera that were previously unknown to engage in CAM (Jacquiniella, Meiracyllium, Pabstiella, Psychopsis, Pterostemma and Solenidium). We conclude that CAM is the major pathway of carbon acquisition in a small but broadly distributed fraction of tropical orchids and is more prevalent at lower elevations.
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