Photosynthetic pathway types in rangeland plant species from Inner Mongolia, North China

文献类型： 外文期刊

第一作者： Liu, XQ

作者： Liu, XQ;Wang, RZ;Li, YZ

作者机构：

关键词： C-3;C-4, and CAM plants;carbon isotope ratio;Xilingol steppe;delta C-13

期刊名称：PHOTOSYNTHETICA （ 影响因子：3.189； 五年影响因子：3.38 ）

ISSN： 0300-3604

年卷期： 2004 年 42 卷 3 期

页码：

收录情况： SCI

摘要： Photosynthetic pathway types, based on delta(13)C measurements, were determined for 125 species in 95 genera and 32 families growing in rangelands from Inner Mongolia. Of the total species, 4 species from 3 genera and 2 families had C-4 photosynthesis (2 species in Gramineae and 2 in Chenopodiaceae) and 118 species from 90 genera and 31 families had C-3 photosynthesis. The number Of C4 species differed significantly among four rangeland sites, 4 species in desert, 3 species in steppe, but no C4 species were identified in meadow and dune. Six species [e.g. Agriophyllum arenarium Bieb., Bassia dasyphylla O. Kuntze, Saussureajaponica (Thunb.) DC.] earlier identified as C4 species using the enzyme ratio method were found as C3 species using the carbon isotope ratios (delta(13)C). Hence the enzyme ratio method for C-3 and C-4 identification may not always be reliable. The delta(13)C values of 3 species of Crassulaceae, which had been considered as CAM species, differed remarkably [-25.79 parts per thousand for Sedum aizoon L., -24.42 parts per thousand for Osostachysfimbriatus (Turcz.) Berger, and 16.97 %o for O. malacophyllus (Pall.) Fisch], suggesting that the Use Of delta(13)C method as a diagnosis for CAM photosynthetic pathway type may not always be reliable and supplementary measurements are needed.

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