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密穗早×烟农15这个杂交组合的P_1、P_2、F_1、F_2、B_1和B_2六个世代,播种在随机区组设计的试验中,获得了第一朵小穗花开放期、株高、单株有效穗数、穗长、每穗结实小穗数、穗拉数、百粒重和小区籽粒产量等八个性状的资料。F_1与亲本平均值差异极显著的有第一朵小穗花开放期、株高、百粒重和籽粒产量,差异达显著水平的有每穗粒数。这些性状均符合加性—显性—上位性模型。狭义遗传力以百枉重、第一朵小穗花开放期、株高和穗长较高,分别为0.7061、0.6755、0.6705和0.5636,均达极显著水平。预期遗传进度也是这四个性状最高,分别为24.3％、54.9％、15.8％和16.3％。穗长和结实小穗数符合加性—显性模型,其它六个性状都表现有上位性效应。在被育种工作者选择的农艺性状中,不能忽视非等位基因互作的影响。
Six generations of P_1, P_2, F_1, F_2, B_1 and B_2 of this hybrid combination were sown in a randomized block design trial. The results showed that the first spikelet flowering stage, plant height, Effective panicle number, spike length, number of spikelets per panicle, number of spikelets per panicle, grain weight per 100 and plot yield. The significant difference between F_1 and the average of parents was the number of grains per panicle at the first spikelet flower opening, plant height, grain weight per 100 grains and grain yield. These traits are in line with additive - dominance - epistasis model. Narrow sense of heritability in vain, the first spikelet flower opening, higher plant height and spike length, respectively 0.7061,0.6755,0.6705 and 0.5636, reached a significant level. The expected genetic progress is also the highest of these four traits, namely 24.3%, 54.9%, 15.8% and 16.3% respectively. The spike length and number of spikelets fit the additive-dominance model, and the other six traits showed epistatic effects. In agronomic traits chosen by breeders, the effects of non-allelic interactions can not be ignored.