利用PH4CV×A6 F1进行进行单倍体育种而育成的336份DH系为父本,以PH6WC为母本组配336个杂交组合,针对2年鉴定淘汰后综合性状较好的14个组合及先玉335(PH6WC×PH4CV)、通育99(PH6WC×A6)进行3次重复鉴定试验,并就10性状加显效应进行了方差、遗传系数和聚类分析。结果表明：株高、穗位高、子粒水分、百粒重、容重存在超高亲、超低亲遗传,粒穗比存在超高亲遗传,穗粒重无超高亲遗传；各性状对穗粒重通径系数大小,正向作用为：百粒重＞穗行数＞穗长＞容重＞株高＞穗位高,负向作用为(绝对值)：子粒水分＞粒穗比＞秃尖长；14个DH系可划分为3个群,PH4CV和A6的卡方距离为3.45,D752与A6卡方距离为1.96。本轮单倍体育种实践,只有D752穗粒重加显效应达到PH4CV水平,同时兼顾了低株高、低穗位等多数优良性状,改良效率为0.30%。
英文摘要:
Using 336 DH lines bred by haploid breeding from F1of PH4CV × A6 were male parents, and 336 hybrid combinations were made with ph6wc as female parent. Three repeated identification tests were carried out for 14 combinations with better comprehensive characters and Xianyu 335 (PH6WC × PH4CV) and Tongyu 99 (PH6WC × A6) after 2-year identification and elimination. Variance, genetic coefficient and cluster analysis were carried out for the additive dominant effect of 10 characters. The results showed that plant height, ear height, grain moisture, 100 grain weight and bulk density had super high parent and super low parent heredity, the ratio of grain to ear had super high parent heredity, and the grain weight per ear had no super high parent heredity. The effect of path coefficient of each character on the grain weight per ear was: 100 grain weight > ear row number > ear length > bulk density > plant height > ear height and the negative effect was (absolute value): grain moisture > grain ear ratio> bald tip length. 14 DH lines can be divided into 3 groups, The chi square distance of PH4CV and A6 is 3.45, and that of D752 and A6 is 1.96. In this round of haploid breeding practice, only D752 ear grain weight additive dominant effect should reach PH4CV level, while taking into account the low plant height, low ear height and other excellent characters, the improvement efficiency is 0.30%.
;
