玉米自交系抗旱性评价及指标筛选

Drought resistance evaluation and index screening of maize inbred lines

为筛选可用于抗旱性评价的有效指标,创制性状稳定、干旱条件下高产且适应性广的抗旱玉米新品系,试验以40份玉米自交系为材料,于吐丝期设置干旱胁迫处理,测定其形态指标、生理指标,收获后进行考种及产量测定。结果表明:花期间隔(ASI)、百粒重和穗位高可作为评价玉米自交系抗旱性的次级性状指标。综合运用次级性状指标抗旱系数的平均隶属度值和产量抗旱指数隶属度值对40份玉米自交系抗旱性及产量潜力进行分类,可划分为3种类型:11份高产抗旱型玉米自交系,编号为2,7,8,11,22,25,27,29,30,35,39;8份中等抗旱型玉米自交系,编号为4,5,13,15,17,20,21,31;2份低产不抗旱型玉米自交系,编号为33,36。

In this experiment,40 maize inbred lines were used as materials.Drought stress treatment was set up during the silking period,their morphological and physiological indexes were measured,and seed tests and yield measurements were carried out after harvest.The results showed that ASI,100-seed weight and ear height were the secondary traits to evaluate drought resistance of the maize inbred lines.The drought resistance and yield potential of the 40 maize inbred lines can be classified into three types by comprehensively using both the drought resistance index membership value and yield drought resistance index membership value.Eleven maize inbred lines with high yield and drought resistance were numbered 2,7,8,11,22,25,27,29,30,35,39.Eight maize inbred lines with moderate drought resistance were numbered 4,5,13,15,17,20,21,31.Two maize inbred lines with low yield and no drought resistance were numbered 33 and 36.