甜菜块根农艺性状的遗传变异及相关性和主成分分析

以25个新疆甜菜品系（种）为材料,对块根8个主要农艺性状进行变异系数、相关性和主成分分析。结果表明：根头长度的变异系数较大为29.14%,根宽的变异系数最小为7.86%。在相关性上,糖甜菜根宽、根颈周长、根头长与根重呈极显著正相关;甜菜含糖率与根体长度呈极显著的正相关。主成分分析结果表明,前3个主成分对含糖率变异的累计贡献率达到85.21%,对根重变异的累计贡献率达到88.53%。首先对变异大的性状进行选择是非常重要的,在含糖率性状选择上,应注意选择根颈长度、根颈周长、根体长度大,根沟较深的品系（种）。在根重性状选择上,应注意选择根宽、根颈周长、根颈长度大,根沟较浅的品系（种）。

Genetic Variation,Correlation and Principal Component Analysis on Agronomic Traits of Sugarbeet Root

The genetic variation,correlation and principal component of eight agronomic traits of 25 sugarbeet cultivars were analyzed,and the sugarbeet cultivars are mainly planted in Xinjiang.The results showed that coefficient of variation,root-tip length was the greatest about 29.14%,and rood-width was the least about 7.86%.Correlation analysis indicated that there was a significant positive correlation between root weight and rood-width,circumference of root crown,root-tip length,and between sugar content of beet and root-body length.Principal component analysis showed that the first three principal components accounted for 85.21% on total variation of sugar content,and total variation of sugar root weight was 88.53%.It was an important for great variant agronomic traits to select.For sugar content breeding,it is considerable to select length of root crown,circumference of root crown,length of root-body and deep root-ditch.The wide root breadth,long circumference of root crown,length of root-body,length of root crown and superficial root-ditch would be considered for root weight breeding.