Lipoxygenase Activity,Carotenoids Content and Wholemill Colors in Grains of Twenty Wheat Varieties

In this experiment,in order to study the influence of lipoxygenase activity,carotenoids content on quality,twenty wheat varieties(or lines) were chosen as materials to study the variations of lipoxygenase activity and carotenoids content in different type of wheat varieties,and to analize the correlationship among lipoxygenase activity and carotenoids content with whiteness and yellowness of whole mill.The results showed there were highly significant variations in lipoxygenase activity,carotenoids content,whole mill whiteness and yellowness among those wheat varieties.Lipoxygenase activity significantly and negatively correlated with carotenoids content,and significantly correlated with whole mill whiteness,and there was no significant correlation between lipoxygenase activity and whole mill yellowness.Carotenoids content was significantly and positively correlated with whole mill yellowness,but not significantly correlated with whole mill whiteness.In this study,cluster analysis was conducted by applying the longest distance(Euclidean distance) clustering test based on the data of lipoxygenase activity,carotenoids content,whole mill whiteness and yellowness,the results showed that one type was of the higher in lipoxygenase activity and whiteness,while lower in carotenoids content and yellowness,including Zhoumai 19 and Yanzhan4110;and another one type was of the lower in lipoxygenase activity and whiteness,while higher in carotenoids content and yellowness,including nine varieties such as Yannong21 and Wanmai47 etal;Other nine varieties with the mid value of those quality traits above was clustered the third type.