关键词: 石榴, 品种, 抗寒性, LT50, 平均隶属度

Abstract: In order to evaluate the cold\|resistance of pomegranate varieties， annual dormant branches of five pomegranate cultivars， Tunisiruanzi（A）， Ningjinsanbaisuan（B）， Yichengsanbaitian（C）， Xinjianghetiantian（D） and Yichengdahongpitian（E） were used as materials. Low temperature stress was simulated and the semilethal temperatures （LT50） and physiologic indexes were studied. The results showed that the order of cold\|resistance was C>B>E>D>A; The trends of SOD activity all presented firstly raised then decreased; The peak of variety A and C emerged at -12℃ and -16℃， respectively， and the others at -14℃; The change of Pro contents generally presented a rising trend， and it firstly increased rapidly between -8℃ and -14℃， then began to flatten; The trends of MDA content were similar to Pro content， and the order was similar to LT50; After cold\|resistance comprehensive evaluation， its concluded that the cold\|resistance level of variety A， B， C， D and E was Ⅴ， Ⅱ， Ⅰ， Ⅲ and Ⅲ， respectively. The results from the method of subordinate function evaluation was the same as LT50， which showed that LT50 value can be used as a feasible method to briefly evaluate cold\|resistance of pomegranate varieties.

Key words: pomegranate, variety, cold\, resistance, semilethal temperature, average subordination value