NDLI: Canopy CO$_{2}$ concentrations and Crassulacean acid metabolism in Hoya carnosa in a subtropical rain forest in Taiwan: consideration of CO$_{2}$ availability and the evolution of CAM in epiphytes

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Canopy CO$_{2}$ concentrations and Crassulacean acid metabolism in Hoya carnosa in a subtropical rain forest in Taiwan: consideration of CO$_{2}$ availability and the evolution of CAM in epiphytes

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Canopy CO$_{2}$ concentrations and Crassulacean acid metabolism in Hoya carnosa in a subtropical rain forest in Taiwan: consideration of CO$_{2}$ availability and the evolution of CAM in epiphytes

Content Provider	Springer Nature Link
Author	Hsu, C. C. Lin, T. C. Chiou, W. L. Lin, S. H. Lin, K. C. Martin, C. E.
Copyright Year	2006
Abstract	The potential importance of CO$_{2}$ derived from host tree respiration at night as a substrate for night time CO$_{2}$ uptake during CAM was investigated in the subtropical and tropical epiphytic vine Hoya carnosa in a subtropical rainforest in north-eastern Taiwan. Individuals were examined within the canopies of host trees in open, exposed situations, as well as in dense forests. Although night time CO$_{2}$ concentrations were higher near the epiphytic vines at night, relative to those measured during the day, presumably the result of CO$_{2}$ added to the canopy air by the host tree, no evidence for substantial use of this CO$_{2}$ was found. In particular, stable carbon isotope ratios of H. carnosa were not substantially lower than those of many other CAM plants, as would be expected if host-respired CO$_{2}$ were an important source of CO$_{2}$ for these CAM epiphytes. Furthermore, laboratory measurements of diel CO$_{2}$ exchange revealed a substantial contribution of daytime CO$_{2}$ uptake in these vines, which should also result in lower carbon isotope values than those characteristic of a CAM plant lacking daytime CO$_{2}$ uptake. Overall, we found that host-respired CO$_{2}$ does not contribute substantially to the carbon budget of this epiphytic CAM plant. This finding does not support the hypothesis that CAM may have evolved in tropical epiphytes in response to diel changes in the CO$_{2}$ concentrations within the host tree canopy.
Starting Page	130
Ending Page	135
Page Count	6
File Format	PDF
ISSN	03003604
Journal	Photosynthetica
Volume Number	44
Issue Number	1
e-ISSN	15739058
Language	English
Publisher	Kluwer Academic Publishers-Consultants Bureau
Publisher Date	2006-01-01
Publisher Place	New York
Access Restriction	Subscribed
Subject Keyword	Plant Physiology
Content Type	Text
Resource Type	Article
Subject	Physiology Plant Science

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