大麦株高近等基因系的籽粒性状差异及相关性分析

Difference and Correlation Analysis of Grain Traits in the Near-isogenic Line of Plant Height of Barley

为给大麦遗传研究和优质育种提供理论依据,以20对二棱啤酒大麦株高近等基因系为材料,研究近等基因系中半矮秆基因uzu对籽粒千粒质量、粒长、粒宽、粒厚和长宽比的影响及籽粒性状的相关性。结果表明:在20对近等基因系中,籽粒千粒质量在高秆基因系(无半矮秆基因uzu)和矮秆基因系(含半矮秆基因uzu)之间差异达显著或极显著水平,即半矮秆基因uzu降低了籽粒的千粒质量,亦降低了粒长和长宽比,但对籽粒的粒宽、粒厚作用并不明显。近等基因系之间的籽粒性状差异较大。相关分析表明:在高秆近等基因系中,籽粒千粒质量之间差异最为显著;千粒质量与粒宽、粒厚呈极显著正相关,与粒长呈显著相关,且与粒宽相关性最大,而与籽粒长宽比呈极显著负相关。在矮秆近等基因系中,籽粒千粒质量同样差异最为显著;千粒质量与粒长、粒宽、粒厚均存在极显著正相关,且与粒长相关性最大,而与籽粒的长宽比则无显著相关。

The difference and correlation of grain traits,including 1000-kernel weight,grain length,grain width,grain thickness and ratio of grain length to width in twenty pairs of the near-isogenic lines of barley were analyzed in order to study the effect of the semi-dwarfing gene uzu on grain traits. The results indicated that the differences of 1000-kernel weight were significant or highly significant between tall isogenic line（ without uzu） and dwarf isogenic line（ with uzu）,which showed the semi-dwarfing gene uzu led to the reduction of 1000-kernel weight,also reduced the grain length and the ratio of grain length to width,but there was no effects on the grain width and the grain thickness. In tall isogenic lines of barley,the correlation analysis showed that the difference of 1000-kernel weight was the most significant; The 1000-kernel weight showed highly significant positive correlation with grain width and grain thickness,and significant positive correlation with grain length,and the most correlation with grain width; But the 1000-kernel weight showed highly significant negative correlation with ratio of grain length to width.In dwarf isogenic lines of barley,similarly,the difference of 1000-kernel weight was the most significant; The 1000-kernel weight showed highly significant positive correlation with grain length,grain width and grain thickness,and the correlation between 1000-kernel weight and grain length was the largest; However,there was no significant correlation between 1000-kernel weight and ratio of grain length to width.