烟草F_(2:3)家系7个主要产量性状的遗传变异分析

Genetic Variation Analyze of Seven Yield Traits of F_(2:3) Family in Tobacco

在福州与龙岩2个环境下,以烤烟品种‘台烟7号’与白肋烟品种‘白肋21’为亲本构建的127个F2:3家系为材料,对株高、叶长、叶宽、叶片数、分枝数、生育期和茎叶夹角7个性状进行遗传分析。结果表明:2种环境条件下,F2:3家系大部分性状分离明显,且基本符合正态分布,为多基因控制的数量性状,是一个较为理想的QTL作图群体。F2:3家系内各性状都存在不同程度的差异,分枝数变异系数最大,叶长、生育期变异系数最小,表明受环境影响较大。由各性状之间的相关分析得出:在2种环境下,21对性状中均有13对达到极显著水平,其中大部分性状相关系数均大于0.3,说明F2:3群体主要产量性状间具有复杂的相关关系。

Using a population with 127 F2：3 individuals from the cross ＇ Taiyan7 ＇ and ＇ Burley 21 ＇ to analysis seven yield traits by genetic statistics：plant height,leaf length,leaf width,leaf number,branch number,growth duration and leaf angle in two locations,Fuzhou and Longyan,respectively.The results revealed that obvious segregations exist among almost traits of F2：3 families,which showed typical quantitative characteristics in nature under the two environments.Almost all traits showed normal distributions which reflected these F2：3 families were suitable for QTL mapping.Various differences showed in each trait of the F2：3 families,the CV of branch number were the largest while the leaf length and growth duration was opposed,which indicated that they were greatly influenced by the environment.According to the correlation analyze of yield traits from F2：3 population under the two environments,13 pairs of traits were extremely significant correlations among 21 pairs,while the correlation coefficient of almost traits were more than 0.3,which showed the main yield traits of F2：3 groups has a complex correlation.