关键词: 百合, 鲜切花, 干旱胁迫, 抗氧化酶活性

Abstract: This study selected three varieties of lily，‘Robina’，‘Sorbonne’and‘Siberia’as materials，to determine the effects of drought stress on their relative water，soluble protein，malondialdehyde content，antioxidant enzyme activity and expression of antioxidant enzyme related genes. Drought resistance was evaluated comprehensively by membership function method. Results showed that relative water content and soluble protein content of petals decreased with the increase of drought stress，while the content of malondialdehyde（MDA），which represents the degree of membrane peroxidation，continued to rise until the end of drought stress. Under drought stress，activities of superoxide dismutase（SOD），catalase（CAT），peroxidase（POD），glutathione reductase（GR）and ascorbic acid peroxidase（APX） of petals continued to rise in the early and middle stages of treatment，but declined in the later stage，showed that petal cells had higher ROS scavenging capacity at early and middle stages，and then antioxidant capacity decreased. Expression of Cu-ZnSOD，MnSOD，CAT，APX and GR increased first and then decreased，while the expression of Fe-SOD decreased all the time，and the POD kept increasing. According to the average value of membership function，drought resistance of these three lily varieties ranked from strong to weak was Sorbonne > Nobina > Siberia.

Key words: lily, cut flower, drought stress, antioxidant enzyme activity