| 生物土壤与生态 |
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| Effects of Dehydration on Photosynthetic Pigment Content and Chloroplast Ultrastructure of Syntrichia caninervis in Biological Soil Crusts |
| WEI Mei-li, ZHANG Yuan-ming |
| Key Laboratory of Biogeography and Bioresource, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China |
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Abstract Syntrichia caninervis is the dominant moss in biological soil crusts in the Gurbantunggut desert. In this paper, the effects of dehydration on photosynthetic pigment content and chloroplast ultrastructure of Syntrichia caninervis are studied. The results show that four phases can be clearly defined concerning the alternation of photosynthetic pigment content and chroloplast ultrastructure in the process of dehydration. (1) Initiation phase: The photosynthetic pigment content increased and there was no significant difference between wet and drought treatments after 2 hours of dehydration (P>0.05), whereas chloroplasts possessed clear longitudinally-distributed thylakoids and lamellar structure. The membrane system of various kind of cell structure remains intact. (2) Rapid increase phase: After 2—6 hours of dehydration, the photosynthetic pigment content increased and reached a maximum value after 6 hours of dehydration (RWC, 26.4%). At the same time, more osmiophilic particles appeared and were distributed more centralized; (3) Steady phase: After 6—10 hours of dehydration, the photosynthetic pigment content slowly began to decrease (P>0.05), and chloroplasts were still remained intact. (4) Slow decline phase: After 10 hours of dehydration, photosynthetic pigment content decreased with much lower water content. The structure of chloroplasts tended to disintegrate after fully dehydration. The results also indicate that the response of photosynthetic pigment content lags far behind that of structural changes, differing from the seed plants that photosynthetic pigment contents decrease during dehydration. This may due to rapid repairing mechanism of internal structure in cell. The photosynthetic pigments can completely recover after rehydration, which indicates the change of photosynthetic pigments of syntrichia caninervis Mitt. is reversible during the alternation of dehydration and rehydration.
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Received: 15 October 2009
Published: 20 November 2010
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2010, Vol. 30 
