The occurrence of crassulacean acid metabolism in epiphytic ferns, with an emphasis on the vittariaceae
The occurrence of crassulacean acid metabolism in epiphytic ferns, with an emphasis on the vittariaceae
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DOI：
10.1086/430334
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发表时间：
2005-07-01
影响因子：
2.3
通讯作者：
Martin, CE
中科院分区：
文献类型：
--
作者：
Martin, SL;Davis, R;Martin, CE
夜间CO2的吸收和/或增加的可能性进行了研究，在不同程度上，在12种书带蕨科，以及在其他四个家庭的热带附生蕨类植物的7个物种的组织酸度特征的景天科酸代谢（CAM）。CAM的证据（实际上是CAM循环，即，在没有夜间大气CO2吸收的情况下，组织酸度的昼夜变化），虽然变化很大，但在书带蕨科的两个物种中发现。这一发现的生理生态意义是令人困惑的，因为这些植物在深阴影，非常潮湿的栖息地发生是罕见的，如果不是唯一的，在植物表达任何程度的CAM。本研究结果证实了蕨类植物中的CAM不仅限于水龙骨科，而且强调了CAM在高等植物中进化的多系性。
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.