玉米群体混合选择的效果研究

A study of the Effects of Maize Population on Mass Selection

用增广NCⅡ设计,测定中综3号改良群体的配合力,分析5轮混合选择的改良效果。结果表明:混合选择对群体产量、穗长、结实性、行位数和千粒重及其相应一般配合力的改良均有良好效果,中综3号经5轮选择,改良群体产量平均每轮增益2.23%,一般配合力相对效应提高1.031。混合选择对产量等性状的改良与相应一股配合力的改良有同步性,多数性状前3轮改良效果显著。

By using NC a! designing method, the combining ability of Zhong Zong 3 wad tested and the effects of five cycles of selection were analysed. The results showed that mass selection had better effects on the improvement of population grain yield, fecundity , ear length, kernel numberrow and weight per 1,000. After five cycles of mass selection, the improved population grain yield increased by 2. 23% per cycle and GCA by 1. 03. The mass selection improved yield .was synchronous with the improved GCA. Most of the good traits were seen in the first three cycles of selection.