Abstract: Abstract：Three cultivars of Anthunium andraenum（‘Alabamb’，‘Dakote’and‘Pink Champion’）were used to investigate the effects of chilling stress on leaf morphology，relative electric conductivity（REC），malondialdehyde（MDA）content，and activities of catalase（CAT），peroxidases（POD）and superoxide dismutase（SOD）. Results showed that after 48 h treatment under 6 ℃，‘Alabamb’ showed no symptoms of chilling injury except for slight red color with young leaves. However，‘Pink Champion’showed serious symptoms of chilling injury and then died after re-cultivated in greenhouse.‘Dakote’showed slight symptoms of chilling injury with the wilting of young leaves. Under chilling stress，REC and MDA content in‘Alabamb’leaves increased and activities of CAT，POD and SOD kept at higher level. CAT activity increased continuously with the treatment time，and POD activity decreased at the beginning and then increased to a high level，while SOD activity was relatively stable. After 36 h treatment of low temperature，REC and MDA content decreased. In the leaves of‘Dakote’and‘Pink Champion’，after 12 h treatment of low temperature，REC and MDA content increased obviously，and SOD activity began to decrease. CAT activity began to decrease，and POD activity increased sharply after 24 h treatment of low temperature. From the results of the present experiment，it was concluded that chilling resistance of 3 cultivars was decreased in the order of‘Alabamb’，‘Dakote’and‘Pink Champion’.

Key words: Anthunium andraenum, low temperature, relative electric conductivity, MDA, CAT, POD, SOD