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| Influence of Simulated Rainfall on the Physiological Characteristics of Syntrichia caninervis |
| Zhang Jing, Zhang Yuanming |
| Key Laboratory of Biogeography and Bioresource in Arid Land, Xinjiang Institute of Ecology and Geography, Chinese Academy of Sciences, Urumqi 830011, China |
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Abstract Biological soil crusts developed well in the Gurbantunggut Desert, Xinjiang. Syntrichia caninervis Mitt., the dominant species of moss crusts, was studied in this paper. The experiments described here were conducted in laboratory to investigate the influence of simulated rainfall on the physiological characteristics of S. caninervis. The amounts of simulated rainfall were set as 0 mm (control), 2 mm, 6 mm, 10 mm and 15 mm. A series of important physiological index were measured, including water content of plant tissue, pigment content, soluble sugar, free proline, soluble protein, antioxidant enzymes (SOD, CAT, POD) and malondialdehyde (MDA). The results showed that along with an increase in simulated rainfall amounts the water content of plant tissue increased significantly. In other words, along with an increase in the water content of plant tissue, pigment content and soluble protein increased; activities of antioxidant enzymes (SOD, CAT, POD) and soluble sugar content exhibited a general decrease; free proline and MDA decreased firstly and then increased. Under dehydrated conditions, S. caninervis was able to acclimate to the external drought stress by adjusting the activities of antioxidant enzymes (SOD, CAT, POD), as well as the content of soluble sugar and free proline; while S. caninervis was prompt in its response to rainfall in different aspects, the water content of plant tissue and pigment content increased significantly, photosynthetic physiological activities were activated immediately after simulated rainfall, whereas, membrane lipid peroxidation of S. caninervis may be aggravated by excessive rainfall.
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Received: 21 March 2013
Published: 20 March 2014
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Corresponding Authors:
张元明（Email：zhangym@ms.xjb.ac.cn）
E-mail: zhangym@ms.xjb.ac.cn
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2014, Vol. 34 
