The mature leaves of two Feijoa species including Coolidge and Mammoth treated in artificial low temperature) were used to study the cold resistance characteristics of F.sellowiana Berg.The physiological indexes including electrical conductivity,soluble sugar and free proline (Pro),superoxide dismutase (SOD),peroxidase (POD) and malondialdehyde (MDA) were analyzed by principal component analysis.Results showed that during the natural wintering,the performance of conductivity was outstanding and could be used as a single index for ident...