| 生物土壤与生态 |
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| The Photoprotective Mechanism of Desert Plant Reaumuria soogorica under Progressive Soil Drying |
| ZHOU Sheng-hui1, LIU Yu-bing2, TAN Hui-juan2, WANG Jin2 |
| 1.School of Life Science, Northwest Normal University, Lanzhou 730070, China; 2.Shapotou Desert Research & Experiment Station, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract Reaumuria soogorica (pall.) Maxim, a perennial desert semi-shrub widely found in semi-arid environments of China, shows strong tolerance in drought, high temperature and intense radiation in its natural habitat. In present study, the photoprotective mechanism of Reaumuria Soogorica was investigated by analyzing diurnal variation of gas exchange and chlorophyll fluorescence parameters during progressive soil drying. The results showed that: with the soil water content decreased, the leaf water potential of Reaumuria Soogorica declined; the diurnal patterns of net photosynthesis rate (Pn) changed from two-peaks' to one-peak'; the leaf water use efficiency (WUE) increased gradually under drought stress and declined when the plant approaching dormancy; the net photosynthesis rate (Pn), the primary maximum photochemical efficiency of PSⅡ(Fv/Fm) and the quantum efficiency of non-cyclic electron transport of PSⅡ(ΦPSⅡ) decreased obviously at noon; the diurnal variations of minimal chlorophyll fluorescence (F0) significantly increased at first and then decreased. These indicated that the two photo inhibition mechanisms, the xanthophylls cycle-dependent thermal energy dissipation and the reversible inactivation of PSⅡ reaction center under drought stress, are used by Reaumuria Soogorica to survive the high drought.
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Received: 02 October 2008
Published: 20 January 2010
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2010, Vol. 30 
