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对 4个甘蓝型油菜隐性核不育杂交种的杂种优势及自交衰退的测定结果表明 :F1代籽粒产量有显著或极显著的平均优势和竞争优势 ;F2 代籽粒产量优势严重衰退 ,其原因在于不育株和农艺性状的遗传分离 ,导致整齐度差 ,主花序和分枝上有效角果数减少 ,阴花阴角数增加等。但F2 代籽粒产量仍具有一定的剩余优势 ,其大小取决于F1的优势 ,两者呈显著的正相关 (r=0 .832 )
The results of heterosis and inbreeding recession of four inbred hybrids of Brassica napus showed that the grain yield of F1 had significant or extremely significant average and competitive advantages; the grain yield of F2 had a serious recession, The reason is that genetic segregation between the sterile plants and agronomic traits leads to poor uniformity, fewer effective pods on the main inflorescences and branches, and an increase in the number of female and female negatives. However, grain yield in F2 generation still had some residual advantages, and its size was dependent on the superiority of F1. There was a significant positive correlation between the two (r = 0.832)