4.4 Article

Occurrence of crassulacean acid metabolism in Colombian orchids determined by leaf carbon isotope ratios

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

  1. Jose Celestino Mutis Botanical Garden in Bogota
  2. Semilla grant
  3. FAPA grant
  4. grant 'Convocatoria 2018-2019 para la Financiacion de Programas de Investigacion' from Universidad de los Andes [INV-2017-51-1435]
  5. National Science Foundation [DEB 1442199]

向作者/读者索取更多资源

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.

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