Genetic Diversity Analysis of Major Lipid Traits in 227 Peanut Cultivars
In order to better understand the genetic characteristics of peanut oil content and fatty acid components,and to provide a theoretical basis for peanut quality breeding and oil improvement,227 peanut variety resources(bred varieties and local varieties)were selected as the test materials,and variation analysis,correlation analysis,principal component analysis,cluster analysis and other methods were used to analyze the nine main lipid traits of peanut,including oil content,oleic acid,linoleic acid,palmitic acid,stearic acid,arachidic acid,behenic acid,lignin acid content,oleic acid-linoleic acid ratio(O/L),to reveal the correlation between lipid traits and identify the key factors for oil quality improvement.The results showed that the variation coefficient of oleic acid-linoleic acid ratio(O/L)was the largest(73.66％),and the variation coefficients of stearic acid,oleic acid and lin-oleic acid were large,with index values of 22.06％,20.86％and 20.77％,respectively,and there were rich types of variation among varieties.The variation coefficient of other traits was 3.96％～14.83％,and the genetic characteristics were relatively stable.Linoleic acid was positively correlated with palmitic acid,arachidic acid was positively correlated with stearic acid,oleic acid was positively correlated with oleic acid-linoleic acid ratio(O/L),behenic acid was positively correlated with lignin acid.Oleic acid and pal-mitic acid,oleic acid and linoleic acid,palmitic acid and oleic acid-linoleic acid ratio(O/L),linoleic acid and oleic acid-linoleic acid ratio(O/L)were significantly negatively correlated.The nine lipid traits can be synthesized into three principal component factors,namely high oleic acid factor,satu-rated fatty acid factor,and crude fat factor,which contain 86.25％of the germplasm information.The 227 germplasms can be clustered into three major groups,and the first group possesses the highest content of oleic acid,lignin acid,and the highest O/L ratio compared with the other two groups.The second group possesses the higher content of behenic acid and palmitic acid.The third group possesses the higher content of arachidic acid and stearic acid.The result shows that there are obvious differ-ences among the participating varieties,and the genetic diversity is rich.
万方数据
维普
