Cotton seeds were soaked in chitosan solution of different concentrations (0. 1% ,0. 2% ,0. 3% , 0.4% ,0. 5% )for 12 hours in comparison with seeds in water. Then cultured them for 7 days at room temperature and 8 hours at natural light every day. Seed germination rate,germination power,germination index,vigor index and activity of a-amylase, POD and CAT were higher than the control. With the increasing of chitosan concentration,all indexes increaded at first and then decreased, When the concentration was 0. 2% ,the seed germination rate, germination energy, germination index, vigor index, a-amylase, POD and CAT activity were increased by 16. 7% ,3. 17% ,2. 63,30. 7,96. 87% ,37. 42% and 33. 78% respectively, and it was the optimum concentration.%用0.1％、0.2％、0.3％、0.4％、0.5％五种浓度的壳聚糖溶液处理棉花种子12h,以蒸馏水浸种12h为对照.室温培养7d,每天自然光照8h,棉花种子的发芽率、发芽势、萌发指数、活力指数及α-淀粉酶活性、过氧化物酶活性和过氧化氢酶活性均比对照高,且随着壳聚糖浓度的增大各指标均呈先升高后降低的趋势,处理浓度为0.2％时,种子的发芽率、发芽势、萌发指数、活力指数及α-淀粉酶活性、过氧化物酶活性和过氧化氢酶活性分别提高了16.7％、3.17％、2.63、30.7、96.87％、37.42％、33.78％,效果最佳.
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