陆地棉重组自交系群体纤维品质及产量性状遗传变异分析

以陆地棉优质品系0-153和大面积推广的双价转基因抗虫棉品系sGK9708为亲本构建了含有196个F6:8家系的重组自交系群体。在4个环境中,纤维长度、纤维强度、麦克隆值、伸长率、整齐度指数、单株结铃数、铃重、衣分、子指、单株子棉产量及单株皮棉产量等性状均呈正态分布,且存在双向超亲分离。多环境下变异分析表明,各性状家系间及环境间存在极显著差异。除纤维伸长率外,其余各纤维品质及产量性状都具有较高的遗传力,在0.75以上。共有6个家系在纤维长度、细度和强度性状上均超过高亲,可作为优质纤维种质。相关分析显示,有些家系可能打破了纤维品质和产量性状间的负相关。通过聚类分析得出,该群体各系分在了不同的组,表明存在着一定的遗传差异。该群体是进行优异纤维品质相关基础研究的良好材料。

Analysis of Genetic Variation for Fiber Quality and Yield traits in an Recombinant Inbred Population of Gossypium hirsutum L.

A RIL population with 196 F₆₈ lines was developed from an F2 population of Upland cotton (Gossypium hirsutum L.) cross of sGK9708×0-153. sGK9708 is the commercial transgenic variety with Bt+CpTI genes resistant to budworm, and 0-153 with high fiber quality. The RIL population were normally distributed for fiber quality and yield related traits and the range of distribution exceeded the two parents. Analysis of genetic variability indicated that the effects of the genotypes and environments were significant for the fiber quality and yield related traits. With the exception of fiber elongation, heritability estimated for fiber quality and yield related traits measured in the RIL population were high with above 0.75. Six lines could be considered as excellent germplasm with high fiber quality. A number of phenotypic correlations were observed among the fiber quality and yield related traits of the RIL population, some lines may be with positive correlation between fiber quality and yield traits.  The different genetic units for the RIL population were indicated by analysis of cluster. This RIL population will be the good materials for the basic research related to fiber quality.