Diversity Analysis of Grain Appearance and Quality Traits of Hulless Barley Varieties on the Qinghai-Tibet Plateau
In order to select hulless barley resources with excellent grain appearance and quality,this study analysed and evaluated the grain phenotypic and quality traits of 117 hulless barley varieties.The results showed that the coefficients of variation for both the appearance and quality traits of different barley varieties ranged 2.57%-1 9.29%.Among phenotypic traits,the coefficient of variation of grain width was the largest(19.29%),and 1000-grain weight was the minimum(7.63%).Among the quality traits,the coefficient of variation of amylopectin was the largest(7.39%),and α-maltotrioe was the minimum(2.57%).The correlation analysis showed that 1000-grain weight was significantly positively correlated with grain length grain,width and area,and negatively correlated with the grain length-width ratio,β-glucan content was negatively correlated with the grain length-width ratio.The principal component analysis classified eight main characteristics into three principal components,with the cumulative contribution rate reached 85.85%.According to different classification standards,three different types of categories analysis were obtained.Among the category of grain appearance traits of hulless barley varieties,12 varieties of the group Ⅱ could be used as excellent resource materials for large grains.In the category analysis of hulless barley quality,group Ⅰ were excellent germplasm resources with high α-maltotrioe contents and large grain size,and group Ⅱ were excellent germplasm resources with high contents of β-glucan and amylopectin.Hulless barley varieties had higher average values of all traits in the group Ⅰ of grain appearance traits and quality traits,and performed better,which had the most potential to cultivate excellent hulless barley varieties.The comprehensive evaluation of 117 hulless barley resources showed that Beiqing 6 had the best grain appearance and comprehensive quality traits.
Hulless barleyAppearance traits of grainQuality traitsDiversity analysis