| 生物土壤与生态 |
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| Effects of Freezing and Thawing on Chlorophyll Fluorescence of Syntrichia Caninervis in Biological Soil Crusts |
| ZHANG Jing, ZHANG Yuan-ming |
| Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Science, Urumqi 830011, China |
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Abstract The tolerance to freezing and thawing of Syntrichia caninervis, the dominant species of moss crusts in the Gurbantunggut Desert, China, was investigated using a pulse-modulated fluorometer. The experiments described in this paper were carried out under controlled environmental conditions in a laboratory. Results showed that freezing caused significant decreases in the initial fluorescence yield (F0), the maximal fluorescence yield (Fm), the maximal photochemical efficiency of PSⅡ (Fv/Fm), the potential photochemical efficiency of PSⅡ (Fv /F0), the actual photochemical efficiency of PSⅡ(ΦPSⅡ), the relative rate of electron transport (ETR), and the photochemical quenching coefficient (qP) of S. caninervis (P<0.05), while the non-photochemical quenching coefficient (NPQ) increased gradually. The enhancement of NPQ observed in S. caninervis during freezing process indicated it might protect the photosynthetic structures from photooxidative damage. The rapid recovery of photosynthetic activities in S. caninervis during thawing process suggested that it was capable of tolerating the freezing and thawing cycles. Finally, the chlorophyll fluorescence parameters could recover to their original values at the beginning of freezing. In addition, the chlorophyll fluorescence intensity and the shape of the inductive curve in S. caninervis were strongly affected by the changes of temperature during freezing and thawing. It can be concluded that the photosynthetic structures of S. caninervis remained intact within a certain range of low temperature and the recovery of the chlorophyll fluorescence was reversible upon thawing. The freezing tolerance of S. caninervis is of great ecological significance in an exceedingly harsh desert environment with snow cover in winter.
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Received: 18 May 2010
Published: 20 November 2011
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2011, Vol. 31 
