玉米幼苗期耐盐性评价的研究

为了比较不同玉米的耐盐性差异,同时建立玉米苗期耐盐性的评价体系,在恒定盐胁迫浓度条件下,试验测定了玉米幼苗期某些性状及生理指标,并用隶属函数值法分析了不同玉米品种的耐盐性。结果表明:发芽率、苗高、根长、叶K+/Na+、根相对含水量、苗鲜重、根鲜重、苗干重及根干重盐害系数的隶属函数值随着总隶属函数值的增加而递增,均与总盐害系数隶属函数值呈极显著正相关。结合盐池种植试验,初步确定根长、根鲜重、根干重、苗鲜重、苗干重、叶K+/Na+和发芽率可作为玉米苗期耐盐鉴定指标。

Study on Evaluation of Salt Tolerance of Maize in Seedling Stage

This study was conducted to compare differences in salt tolerance of different maize and to construct the measuring system for evaluating identification indexes of salt tolerance in maize seedlings.Some traits and physiological indexes were measured under constant concentration of salt stress.Furthermore,membership function values were adopted to analyze salt tolerance of different species.The results show that subjection values of salt toxicity coefficient of germination ratio,seedling height,root length,leaf K＋/Na＋,root relative water content,seedling fresh weight,root fresh weight,seedling dry weight and root dry weight increased gradually with the increase of the sum subjection values,and they were positively correlated with the sum subjection values significantly.Based on the salt pool experiments,it is initially determined that root length,root fresh weight,root dry weight,seedling fresh weight,seedling dry weight,leaf K＋/Na＋ and germination ratio can be used to assess the salt tolerance of maize in seedling stage.