【摘要】 通过聚类分析方法,研究晋南旱地42个玉米品种12个农艺、经济性状的耐旱性变化规律。结果表明,对产量直接正向通径作用较大的性状依次为:单穗质量>单穗粒质量>出籽率,负向性状有穗位高、穗行数、穗长,在当地玉米育种中应重点考虑这些性状;当定义遗传距离阈值为3.00时,按产量高低可将玉米材料分为7类,类群Ⅰ品种最多,为11份,且比类群Ⅶ平均产量提高了15.61%,综合性状表现为产量较高、株高中等、秃尖长最小、百粒质量中等、出籽率最高;与对照先玉335相比,类群Ⅰ~Ⅲ内的22个玉米品种综合耐旱性更强,可作为下一步推广种植的候选品种。更多还原

【Abstract】 The paper studied the varying pattern of forty-two maize varieties, twelve agricultural and economical traits’ drought tolerance in Shanxi rainfed farmland, through clustering analysis method. The results showed that single panicle quality, single panicle grain quality and kernel percentage had more directly positive path effect on yield successively, while ear height, ear row numbers and ear length were negative. We should consider these traits adequately in local maize breeding work. The maize varieties could be divided into seven groups by yield trait, according to genetic distance threshold as 3.00. Ⅰ groups had most maize variety numbers, which was eleven.Ⅰ groups’ average yield increased 15.61% than Ⅶ groups’. The comprehensive characters showed higher yield, middle plant height,least bald tip length, middle 100-grain quality and higher kernel percentage. Ⅰ-Ⅲ groups’ twenty-two varieties comprehensive drought tolerance traits were stronger than Xianyu 335, which could be used as candidate varieties in local generalization and cultivation.更多还原