烤烟胞质雄性不育杂种经济性状的遗传分析

Genetic Analysis of Economic Traits in Flue-cured Tobacco Cytoplasmic Male Sterile Hybrids

为明确烤烟胞质雄性不育系在杂种优势利用上应用潜力,以3个烤烟胞质雄性不育系和4个国内推广烤烟品种为材料,配成12个杂种,利用简单加性—显性遗传模型对烤烟产量、产值、均价、上等烟比例、上中等烟比例和级指经济性状进行了遗传分析。结果表明,6个经济性状均有较高的广义遗传率和较低的狭义遗传率,它们的表型变异主要决定于遗传变异;6个经济性状的主要遗传效应为显性主效应和显性×环境互作效应,显性效应明显高于加性效应;在经济性状上显性效应大的亲本,其杂种F1中也同样表现出较高的显性效应,因而具有较大的杂种优势利用潜力。遗传分析显示了新选育的三个烤烟雄性不育系,MsYZ203-6、MsYZ216-1和MsYZ206-9在经济性状的杂种优势利用上具有较大的应用价值。

In order to clarity the utilization potential of flue-cured tobacco cytoplasmic male sterile line in hybrid vigor,twelve hybrids crossed among 3 cytoplasmic male sterile lines and 4 flue-cured tobacco varieties were used to determine the genetic effects in economic characters including yield,production value,average price,high class tobacco ratio,high and middle class tobacco ratio and tobacco class index.The results showed that the 6 economic traits all had high broad heritability and low narrow heritability,and mainly controlled by genetic variance in phynotypic variance.Dominant effect and interaction of dominance and environment were the main genetic effects of the 6 economic characters,and the dominant effects were distinctly larger than the additive ones.The dominant effects of economic traits in parents could highly perform in their hybrid F1.Therefore,the parents with high dominant effects in economic traits had lager utilization potential in heterosis.Genetic analysis indicated the new developed 3 cytoplasmic male sterile lines,MsYZ203-6,MsYZ216-1and MsYZ206-9,had great heterosis in economic traits.