不同玉米品种萌发期及苗期的耐盐性研究

Study on Salt Tolerance of Different Maize Varieties at Germination and Seedling Stages

为筛选适宜盐碱地种植的耐盐玉米品种,以41个玉米品种为试验材料,采用60、120、180 mmol/L NaCl模拟盐胁迫环境,对41个玉米品种的萌发期与苗期的各项指标进行测定,利用加权隶属函数法和聚类分析法对供试玉米品种的耐盐性进行综合评价。结果表明,180 mmol/L NaCl可作为玉米萌发期与苗期耐盐性鉴定的适宜盐浓度。苗干重、苗鲜重、根鲜重和根干重等4项指标与玉米品种的耐盐性最为密切,可作为玉米品种耐盐性鉴选的主要指标。根据加权隶属函数值与系统聚类分析,可将41个玉米品种分为高度耐盐、中度耐盐、耐盐、中度敏感和高度敏感等5个等级,其中高度耐盐品种有6个,分别为农富99、五谷568、宣何8号、郑单958、西蒙3358、新玉81。

In order to screen out the salt-tolerant maize varieties suitable for planting in saline-alkali soil,41 maize varieties were selected as experimental materials and NaCl of 60,120,180 mmol/L was used to simulate the salt stress environment,the indexes of germination and seedling stage of 41 maize varieties were determined.The salt tolerance of maize varieties was comprehensively evaluated by weighted membership function and cluster analysis.The results showed that 180 mmol/L NaCl could be used as a suitable salt concentration for the identification incluing salt tolerance of maize at germination and seedling stages.The four indexes including seedling dry weight,seedling fresh weight,root fresh weight and root dry weight were the most closely related to the salt tolerance of maize varieties,which could be main indexes for screening and identifying maize varieties with salt tolerance.According to the weighted membership function and systematic cluster analysis,41 maize varieties could be divided into 5 grades:high salt tolerance,moderate salt tolerance,salt tolerance,moderate sensitivity and high sensitivity,among which there were 6 high salt-tolerant varieties,namely,Nongfu 99,Wugu 568,Xuanhe 8,Zhengdan 958,Simon 3358,Xinyu 81.