Photosynthesis and Chlorophyll a Fluorescence of Two Poplars under Water Stress

概要

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In order to estimate drought tolerance in two pecies of Populus, Populus alba var. pyramidalis Bunge and Populus nigra L. var.thevestina (Dode), widely planted at the southern margin of the Taklimakan Desert, responses of net photosynthesis and chlorophyll a fluorescence to irradiance and water stress were examined under laboratory conditions. Results showed that P. alba exhibited stronger drought tolerance than P. nigra. A linear relationship between net photosynthetic rated (A_n) and electron transport rates (ETR) was found in both poplars under different irradiance and leaf water potentials. Net photosynthetic rates (A_n) in the two poplars significantly correlated linearly with the photochemical efficiency of the saturation light-adapted leaves throughout the range of leaf water potentials, suggesting that the leaf photochemical efficiency in saturation light-adapted leaves can be used to estimate leaf photosynthetic capacity and leaf water conditions in the two poplars within a magnitude of air temperature between 20 and 30℃.
日本森林学会の論文
2001-08-16