Salt Tolerance Screening of Six Maize Varieties

doi:10.11924/j.issn.1000-6850.casb16080094

Abstract

Abstract: Screening different varieties of maize salt tolerance, pilot study its physiological mechanisms to explore and exploit maize varieties with excellent tolerance, and lay the foundation for the further study of saline soil field.This experiment uses vermiculite as medium,sets seven NaCl concentration levels of 0mmol/l、45mmol/l、95mmol/l、145mmol/l、195mmol/l、245mmol/l、295mmol/l,tests six maize varieties mass growth at seedling stage of Luyu 39、Huanong 138、Xianyu 335、Aoyu 3007、Yayu 8、Jinping 618, uses the regression equation between growth amount and salt concentration to draw the suitable growth concentration and critical concentration of six maize varieties.Test the activity change of antioxidant enzymes and content change of MDA and proline under different salt concentration stress. Analyze changes of physiological indices under different salt concentration stress. Filter the salt tolerance of six maize varieties.The results showed that the suitable growth NaCl concentration and critical growth NaCl concentration of 6 maize varieties are different. The suitable and critical growth NaCl concentration of Luyu 39 and Huanong 138 are 158.8mmol/l、300mmol/l, which has good salt tolerance. However, the suitable and critical growth NaCl concentration of Jinping 618 is 101.1mmol/l、195.4mmol/l, which has poor salt tolerance.POD activity, SOD activity, CAT activity of six maize varieties leaves, can reach the maximum value at about 195mmol/l salt concentration.With the salt concentration increase, the activity shows increase first then decrease, but it has difference for different varieties increase and decrease value.The content of Proline and MDA were increased with the salt concentration rising, but it varies with the increase value for different varieties. Comprehensive analysis, Luyu 39 and Huanong 138 has better salt tolerance, which is more suitable for further field studies on saline soil.

Jia Danli,Yang Zhiping,Guo Junling,Guo Caixia and Wang Yongliang. Salt Tolerance Screening of Six Maize Varieties[J]. Chinese Agricultural Science Bulletin, 2017, 33(11): 1-8.

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