摘要
The potential for nighttime CO2 uptake and/or increases in tissue acidity characteristic of crassulacean acid metabolism (CAM) was investigated, to varying degrees, in 12 species of Vittariaceae as well as in seven species in four other families of tropical epiphytic ferns. Evidence of CAM (actually CAM cycling, i.e., diel changes in tissue acidity without nighttime atmospheric CO2 uptake), though highly variable, was found in two species of Vittariaceae. The ecophysiological significance of this finding is puzzling, because the occurrence of these plants in deeply shaded, extremely moist habitats is rare, if not unique, among plants expressing any degree of CAM. The results of this study confirm that CAM among the ferns is not limited to the Polypodiaceae, and they emphasize the polyphyletic nature of the evolution of CAM among higher plants.
原文 | 英語 |
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頁(從 - 到) | 623-630 |
頁數 | 8 |
期刊 | International Journal of Plant Sciences |
卷 | 166 |
發行號 | 4 |
DOIs | |
出版狀態 | 已發佈 - 2005 7月 |
對外發佈 | 是 |
ASJC Scopus subject areas
- 生態學、進化論、行為學與系統學
- 植物科學