Sun/shade adaptations of the photosynthetic apparatus of HOYA carnosa, an epiphytic CAM vine, in a subtropical rain forest in northeastern Taiwan

Craig E. Martin, Rebecca C.C. Hsu, Teng Chiu Lin*

*此作品的通信作者

研究成果: 雜誌貢獻期刊論文同行評審

5 引文 斯高帕斯(Scopus)

摘要

Most past work on the ecophysiology of the Crassulacean acid metabolism (CAM) plant, Hoya carnosa, in the lab and in situ in Australia indicates that this epiphytic vine is better adapted to shaded, not exposed, locations, although a recent study of this species in Taiwan presents findings that run counter to this conclusion. Thus, photosynthetic characteristics of shaded and exposed individuals of H. carnosa were compared in situ in a subtropical rain forest in northeastern Taiwan in order to determine whether this CAM epiphyte is better adapted to the shade or the sun. Although leaves of shade plants had much greater chlorophyll concentrations than did those of sun plants, chlorophyll a/b ratios did not differ between the two groups of plants. Fluorescence measurements revealed some ability of leaves to acclimate to both shade and sun, although some evidence for photoinhibition (photoprotection) was observed in more exposed plants. Despite the latter, both exposed and shaded plants exhibited CAM, measured as diel fluctuations in leaf acidity, and CAM was more consistently found in the exposed plants. Further-more, some evidence for more CAM at higher light availabilities was found. Overall, the results of this investigation reveal that H. carnosa in this subtropical rain forest in Taiwan exhibits adaptations to both high and low light levels, which should prove adaptive for an epiphytic vine with leaves on the same individual exposed to a wide range of exposure and shade in the host tree canopy.

原文英語
頁(從 - 到)575-581
頁數7
期刊Acta Physiologiae Plantarum
32
發行號3
DOIs
出版狀態已發佈 - 2010

ASJC Scopus subject areas

  • 生理學
  • 農學與作物科學
  • 植物科學

指紋

深入研究「Sun/shade adaptations of the photosynthetic apparatus of HOYA carnosa, an epiphytic CAM vine, in a subtropical rain forest in northeastern Taiwan」主題。共同形成了獨特的指紋。

引用此