| Biology and Soil |
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| Responses of Different Winter Wheat Cultivars to Sodium Salt and Drought Treatments |
| YANG Shu-de1, ZHOU Rui-lian1, ZUO Jin-cheng1, WANG Yan-fang1, ZHAO Ha-lin2, ZHAO Xue-yong2 |
1.College of Life Sciences, Ludong University, Yantai 264025, Shandong, China;
2.Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou 730000, China |
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Abstract Variation in physiological regulation in response to interaction of salt treatment and drought stress in leaves of six winter wheat cultivars (Triticum aestivam) was studied by measuring the contents of relative water content (RWC), malondialdehyde (MDA), proline and soluble protein, and activities of antioxidant enzymes(SOD, POD, CAT). Results showed that the six winter wheat cultivars with 1.0% NaCl treatment for 10 days under well water supply grew well as control, and there were no significant physiological differences among them. But under drought stress for 12 days, six winter wheat cultivates treated with salt had lower MDA content, higher RWC, higher activities of antioxidant enzymes and higher contents of proline and protein than control without salt treatment. Leaves with salt treatment wilted later than control. While there were different responses to salt treatment and drought stresses for six winter wheat cultivars. In 12 days of drought stress, tolerant cultivars had higher RWC (81%) than susceptible cultivars (62%), and lower MDA contents (decreased by 30%), lower activities of antioxidant enzymes and lower content of protein and proline than susceptible cultivars. But there were no significant diffidence among the winter wheat cultivates. Under interaction of salt treatment and drought stress, it is likely that salt would be a permeable matter to increase winter wheat tolerance to drought by enhancing ability of soil water-holding and leave water-maintaining. Tolerant cultivars of winter wheat had higher ability of salt uptake in leaves under salt treatment, which would result in stronger water-maintaining of tolerant cultivars of winter wheat under drought stress, and lower MDA and lower activities of antioxidant enzymes than susceptible cultivars. This study further indicated that irrigating saline water in arid area can improve winter wheat drought tolerance, but it is a key to select the drought tolerant cultivars in successful agricultural output by irrigating saline water.
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Published: 20 July 2012
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2012, Vol. 32 
