关键词: 小麦; 幼苗期; 耐盐性; 形态指标; 生理指标

Abstract: 【Objective】 To study the effects of salt stress on the morphological and physiological characteristics of winter wheat seedlings and to understand the difference of salt tolerance at the seedling stage of the main cultivated wheat varieties in Xinjiang.【Method】The morphology and the physiological parameters of 11 Xinjiang wheat varieties seedlings were studied by using 2% Na₂SO₄ to simulate the salt stress, and the identification index and the salt tolerance of the seedlings were also analyzed by the weighted membership function method.【Result】Under the condition of stress, the test index and photographic ratio had varying degrees of change. Under the condition of 48 hours of salt stress, the root length and leaf length ratios of different varieties were different compared with the control group. But with the extension of stress time, all varieties declined and the chlorophyll content of the majority of species tested decreased under salt stress. Under the salt stress, the activities of peroxidase in the seedlings of most varieties decreased first and then increased. The changing trend of MDA in different cultivars was different.【Conclusion】The analysis results of salt tolerance coefficient showed that the changing trend of single index could not comprehensively and effectively measure the salt tolerance of wheat. According to the D value of the weighted membership function, the order of the comprehensive evaluation of salt tolerance of all tested varieties at seedling stage is: Xindong 18 > Xindong 35 > Xindong 19 >Xindong 22 > Zhongyou 9507 > Xindong 32 > Xindong 40 > Xindong 23 > Xindong 28 > Xindong 17 > Xindong 20.

Key words: wheat; seedling stage; salt tolerance; morphological index; physiological index