Correlation and Principal Component Analysis on Main Agronomic Traits of New Waxy Corn Varieties
[Objective] This study was conducted to provide certain theoretical reference for the comprehensive evaluation and breeding of new fresh waxy corn varieties.[Method] With 5 good fresh waxy corn varieties as experimental materials,correlation analysis and principal component analysis were performed on 13 agronomic traits,i.e.,plant height,ear position,ear weight,ear diameter,axis diameter,ear length,bald tip length,ear row number,number of grains per row,100-kemel weight,fresh ear yield,tassel length,and tassel branch number.[Result] The principal component analysis performed to the 13 agronomic traits showed that the first three principal components,e.,the fresh ear yield factors,the tassel factors and the bald top factors,had an accumulative contribution rate over 87.276 7％,and could basically represent the genetic information represented by the 13 traits.The first principal component is the main index for the selection and evaluation of good corn varieties which should have large ear,large ear diameter but small axis diameter,e.,longer grains,larger number of grains per ear,higher 100-grain weight and higher plant height.As to the second principal component,the plants of fresh corn varieties are best to have longer tassel and not too many branches,and under the premise of ensuring enough pollen for the female spike,the varieties with fewer tassel branches should be selected as far as possible.From the point of the third principal component,bald tip length affects the marketing quality of fresh corn,and during variety evaluation and breeding,the bald top length should be control at the lowest standard.[Conclusion] The fresh ear yield of corn is in close positive correlation with ear weight,100-grain weight,ear diameter,number of grains per row and ear length,and plant height also affects fresh ear yield.
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