在 - 5℃低温胁迫下 ,夏威夷椰子 (PritchardiagaudichaudiiH .Wendl.)幼苗叶片的丙二醛 (MDA)含量逐渐增加 ,表明膜脂过氧化作用逐渐增强 ;含水量不断下降 ;细胞保护酶中的超氧化物歧化酶 (SOD)、过氧化物酶 (POD)和过氧化氢酶 (CAT)酶活性均先升高 ,然后下降。冷锻炼处理可以减缓夏威夷椰子膜脂过氧化作用的增强 ,促进SOD酶活性的提高 ,同时抑制POD和CAT酶活性的变化 ,因而使夏威夷椰子幼苗的抗寒性得以提高 ,在 - 5℃低温胁迫下的半致死时间从 1.6d延长到 2 .2d。 At low temperature of-5 ℃, the content of malondialdehyde (MDA) in leaves of Pritchardia gaudichaudii H.Wendl. Seedlings gradually increased, which indicated that the lipid peroxidation gradually increased, the water content decreased continuously, and the superoxide The activities of SOD, POD and CAT increased first and then decreased. Cold workout treatment could reduce the increase of membrane lipid peroxidation, promote the increase of SOD activity and inhibit the change of POD and CAT enzyme activities in Hawaii. Therefore, the cold resistance of Hawaiian coconut seedlings could be improved. Under low temperature stress of -5 ℃, Under the lethal time extended from 1.6d to 2.2d.