玉米自交系苗期耐盐性鉴定及筛选研究

旨在加强玉米耐盐性的研究和利用，本研究采用水培法，以NaCl胁迫拟田间盐生条件，在适宜的盐胁迫处理浓度的基础上，以耐盐系数为指标，通过主成分分析、隶属函数分析和聚类分析对242 份玉米自交系苗期的耐盐性进行综合鉴定。结果表明：发芽率、根干重、苗干重、根鲜重、根长和苗鲜重可作为玉米自交系的苗期耐盐性筛选和鉴定指标；通过聚类分析可将242 份玉米自交系苗期的耐盐性划分为5 类，其中B红-2 等12 份玉米自交系的耐盐性较强，NC320 等42 份玉米自交系的耐盐性中等，50K-4-1 等58 份玉米自交系的耐盐性一般，H070480 等77 份玉米自交系的耐盐性敏感，甘1 号等53 份玉米自交系的耐盐性高度敏感。

Salt-tolerance Identification and Screening of Maize Inbred Lines at Seedling Stage

To enhance the research and application of maize salt tolerance, we use hydroponics with NaCl stress simulating salt condition in field. Based on appropriate NaCl stress concentrations, and taking the salt tolerance coefficients as indexes, we identified the salt tolerance of 242 maize inbred lines at seedling stage through principal component analysis, membership function analysis and cluster analysis. The results showed that, the germination rate, root dry weight, seedlings’dry weight, root fresh weight, root length, and seedlings’ fresh weight could be used as indicators for screening and identifying salt- tolerant maize inbred lines at seedling stage. With clustering analysis, 242 maize inbred lines at seedling stage were classified into five groups: 12 were high salt-tolerance, like B hong-2; 42 were medium salt-tolerance, like NC320; 58 were general salt-tolerance, like 50K-4-1; 77 were salt-sensitive, like H070480; and 53 were highly salt-sensitive, like Gan 1.