关键词: 玉米, 混合盐碱胁迫, 种子萌发, 生理生化特性, 耐盐碱评价

Abstract: In order to explore the ability of saline-alkaline tolerance and the evaluation indexes of 6 maize varieties in the Tumochuan plain, this paper used indoor germination and outdoor sand training test to study the effects of mixed saline-alkali stress on the physiological and biochemical characteristics of maize seed germination and seedling growth. The results showed that: Under mixed salt and alkali stress, the germination time was delayed and the germination process was prolonged. With the increase of saline-alkali stress intensity, the seed germination rate and embryo growth of maize showed a significant trend of decrease; the salt damage index gradually increased; the degree of inhibition on the growth of maize plants also gradually increased; the content of malondialdehyde (MDA), proline and superoxide dismutase (SOD) in young leaf increased gradually; soluble protein content decreased gradually. The salt resistance of 6 maize varieties were: Yulong 2 > Jidan 535 > Yulong 8 > Dongdan 969 > Nongfu 9 > Nanbei 1. According to the principal component analysis results of 11 evaluation indexes of saline-alkali resistance, seed germination rate, embryo growth, plant height, biomass and proline content were finally selected as the characteristic factors to evaluate the saline-alkali resistance of maize.

Key words: corn, complex saline-lkaline stress, seed germination, physiological and biochemical parameter, saline-alkali tolerance evaluation