外源水杨酸提高水稻萌发种子抗冷性的生理效应

Effects of salicylic acid on improving cold-resistance of germinated rice seed

冷害条件下外源水杨酸能够提高水稻种子发芽率 (GR)、发芽指数 (GI)和活性指数 (VI) ,降低低温胁迫对细胞膜的伤害 ,提高萌发种子的 α-淀粉酶、过氧化物酶 (POD)和超氧化物歧化酶(SOD)活性 ,降低低温胁迫对水稻的伤害 ,提高其对低温胁迫的适应性 .在 4℃冷害条件下 ,外源水杨酸的最适作用浓度为 0 .0 5 g/L.

In this paper, the effect of AS on improving cold resistance of germinated rice seed was investigated. The rice was treated with series of SA(0.01 g/L～0.20 g/L). The results showed that SA can increase the germinate ratio, germinate index and activities index; in correspondence, it can increase the activity of asylum enzyme, SOD and POD. The optimum density is 0.05 g/L.