基于玉米单倍体性状表现的轮回选择试验研究

单倍体水平的选择可以提高轮回选择程序的效率。经过4个周期的单倍体轮回选择之后,一个综合群体SPC4的产量达到了当前商业杂交种的产量水平。SPC4群体与27个来自于爱荷华州立大学的综合群体相比较具有更好的群体表现。两个单交种在单倍体水平上表现出株高和穗长的超亲分离,表明利用单倍体植株来鉴定、创造和改良优良的育种材料是非常有效的方法。

Selection and Breeding Experiments at the Haploid Level in Maize

Selection at the haploid level allows increasing the efficiency of recurrent selection procedures. Af-ter four cycles of a recurrent selection approach involving haploid plants, grain yield of a synthetic population, SPC4, was at the same level as that of current commercial hybrids. The SPC4 population had a good performance in comparison with 27 synthetic populations obtained from Iowa State University. Transgressive segregation for plant height and ear length was revealed at the haploid level in two single crosses. It was demonstrated that the utilization of haploid plants to identify, create and improve elite breeding material might be very efficient.