Physiological responses and adjustment mechanisms of the dominate species of natural vegetation of Eastern Tengger Desert |
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| Authors: | HaiYan Zhou HuiJuan Tan ZhiShan Zhang XiaoHong Ji HengWen Fan JianLi Yuan |
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| Affiliation: | 1. Shapotou Station of Desert Experimental Research, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China2. Extreme Stress Resistance and Biotechnology Laboratory, CAREERI, CAS, Lanzho;1. Shapotou Station of Desert Experimental Research, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China2. Extreme Stress Resistance and Biotechnology Laboratory, CAREERI, CAS, Lanzho;1. Shapotou Station of Desert Experimental Research, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China2. Extreme Stress Resistance and Biotechnology Laboratory, CAREERI, CAS, Lanzho;1. Shapotou Station of Desert Experimental Research, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China2. Extreme Stress Resistance and Biotechnology Laboratory, CAREERI, CAS, Lanzho;1. Shapotou Station of Desert Experimental Research, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China2. Extreme Stress Resistance and Biotechnology Laboratory, CAREERI, CAS, Lanzho;School of Life Sciences, Lanzhou University, Lanzhou 730000, China |
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| Abstract: | Reaumuria soongorica and Salsola passerina have significant differences in ecophysiological characteristics, which change with the environmental variations. Although they live together for a long period of time, their adaptive mechanisms to environmental stresses are very different. As two extreme xerophytes, Reaumuria soongorica and Salsola passerina differ significantly from other psammophytes in ecophysiological characteristics; they can survive in lower water potential, and can even grow in piedmont areas. Low water potential may be related to the existence of osmosis-regulating substance, such as praline, which can strengthen the capacity of water absorption. Compared to other psammophytes, Reaumuria soongorica and Salsola passerina have a higher degree of photo-inhibition under the same condition, and the photo-inhibition can lead to destruction of the photosynthetic pigment, nevertheless, this photo-inhibition can be repaired under suitable conditions in the morning and evening. |
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| Keywords: | gas exchange water potential osmosis regulating Reaumuria soongorica Salsola passerina |
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