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JOURNAL OF DESERT RESEARCH  2013, Vol. 33 Issue (6): 1743-1749    DOI: 10.7522/j.issn.1000-694X.2013.00260
Biology and Soil     
Physiological Responses of Seven Wild Poa species to Simulative Drought Stress
DONG Qin, LU Cun-hai, BAI Xiao-ming, HE Jia-yuan, LEI Ya-wei, L You-wei
College of Pratacultural Science, Gansu Agricultural University/Key Laboratory of Grassland Ecosystem(Gansu Agricultural University), Ministry of Education/Pratacultural Engineering Laboratory of Gansu Province/Sino-U.S. Centers for Grazingland Ecosystem Sustainability, Lanzhou 730070, Gansu, China
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Abstract  

In this study, seven species of Wild Poa in Gansu province were selected to measure the physiological responsive indices of malondialdehyde (MDA), soluble protein (SP), catalase (CAT), superoxide dismutase (SOD), free proline and soluble sugar (SS) under simulated drought stress. Further, the relationship between drought resistance and physiological indicators, mean annual precipitation of source and was evaluated. The results showed that the contents of free proline, SS and MDA in leaves increased gradually with increasing drought stress, the CAT and SP showed a decreasing trend with increasing drought stress, while the SOD activity increased a little and then decreased slowly. The comprehensive evaluation values were negatively correlated to the contents of MDA (p<0.01), but positively correlated to CAT. This implied that the contents of MDA and CAT could be served as the main indicators in evaluating the drought resistance of wild Poa genus. The mean annual precipitation of source land was negatively correlated with comprehensive value, but it was not significant (p>0.05). The drought resistant capacities of the seven species were evaluated by standard deviation coefficient allocation weighted method, the seven species were thereby classified into three type: the first category was drought resisted, including P. pratensis, the second category was medium drought resisted, including P. dolichachyra, P. anqustifolia, P. crymophila and P. poophaqorum, and the drought resistance of the third category was weak, including P. declinata and P, micrandra.

Key words:  Poa L.      drought stress      physiological responses      drought resistance     
Received:  01 April 2013      Published:  12 June 2013
ZTFLH:  Q945.78  

Cite this article: 

DONG Qin, LU Cun-hai, BAI Xiao-ming, HE Jia-yuan, LEI Ya-wei, L You-wei. Physiological Responses of Seven Wild Poa species to Simulative Drought Stress. JOURNAL OF DESERT RESEARCH, 2013, 33(6): 1743-1749.

URL: 

http://www.desert.ac.cn/EN/10.7522/j.issn.1000-694X.2013.00260     OR     http://www.desert.ac.cn/EN/Y2013/V33/I6/1743

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