Comprehensive evaluation of phenotypic traits of potato browning germ-plasm resources
A comprehensive evaluation of phenotypic traits of 60 potato germplasm resources in browning population was conducted through genetic diversity analysis,correlation analysis,principal component analysis,and cluster analysis,providing theoretical basis for the breeding and production utilization of new potato varieties resistant to browning.The results showed that the genetic diversity index of 14 descriptive indicators ranged from 0.085 to 1.157,with stem color having the highest genetic diversity index.The coefficient of variation of the 8 numerical indicators ranged from 9.46％to 69.22％,and the variation coefficients of browning index and browning intensity were relatively large.Correlation analy-sis showed that the mass of individual tubers was highly significantly positively correlated with the growth period and number of tubers per plant,and significantly positively correlated with the number of main stems.The browning index was highly significantly positively correlated with the browning intensity and the change in browning intensity at 4 ℃ for 24 hours,and significantly negatively correlated with the browning value after cooking.Principal component analysis identified 8 principal component factors with a cumulative contribution rate of 69.785％.Cluster analysis divided the 60 germplasm resources into 5 major categories.The Ⅰ and Ⅱ categories belonged to high resistance and browning resistant germplasm,which could be used as parental materials for breeding anti browning materials.Class Ⅳ and Ⅴ belonged to germplasm that was prone to browning and severely browning,and could be used as research materials for browning mechanisms.The research results of this experiment could provide some reference for the breeding and genetic improve-ment of new potato varieties with resistance to browning.
万方数据
维普
