试验以大穗结缕草、沟叶结缕草和日本结缕草为试材，研究了不同盐浓度（0，0．2％，0．4％，0．6％，0．8％）对生长期内3种结缕草叶片膜脂过氧化及生长的影响。结果表明，3种结缕草的生物量均随着盐浓度的增加逐渐减小；随着盐浓度的提高及处理时间的延长，3种结缕草的可溶性蛋白含量逐渐降低；相对电导率和丙二醛含量增加，在低盐浓度（0．2％～0．4％）下，两者增加幅度较小，当盐浓度为0．8％时，3种结缕草的相对电导率均达最大值，分别是38．71％，41．32％，40．97％，可溶性蛋白含量均达到最小值，分别为2．08，1．15和1．33 mg／g FW。Pro 含量在处理后第10天达最大值，之后逐渐下降，后期变化比较平稳。在低盐浓度（0．2％～0．4％）下，CAT 和 SOD 活性逐渐降低，而高盐浓度（0．6％～0．8％）下，两种酶活性呈上升－下降－上升的趋势。3种结缕草相比，大穗结缕草在高盐浓度胁迫下的相对电导率和丙二醛含量最低，而保护酶活性和可溶性蛋白含量最高。试验证明大穗结缕草抗盐能力最强，沟叶结缕草次之，日本结缕草较差。%The effects of salt (NaCl)on the antioxidant system and soluble protein content during growth of Zoysia macrostachys ,Z .matrella and Z .japonica was investigated.The biomass and the soluble protein con-tents of all three grasses reduced gradually with increasing salt concentration and duration of exposure,while leaf relative conductance and malondialdehyde (MDA )content increased.Under lower salt concentration (0.2%-0.4%),leaf relative conductance and MDA increased slightly,but both peaked at 0.8% salt.The proline content peaked 10 days after treatment application but subsequently declined.Under lower salt concen-trations the activities of catalase and superoxide dismutase in all three grasses reduced gradually,while under 0.6%-0.8% salt,they initially increased,declined and then increased again.Z .macrostachys had the lowest leaf relative conductance and the lowest MDA,but the highest protective enzyme activity and soluble protein content.Consequently Z .macrostachys demonstrated greater salt resistance than Z .matrella and Z .japoni-ca.
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