水杨酸和阿斯匹林对小麦盐害的缓解作用

盐胁迫条件下水杨酸和阿斯匹林能提高小麦种子发芽率、发芽指数和活力指数，降低幼苗叶片质膜透性和盐胁迫对细胞膜的伤害，提高幼苗体内超氧化物歧化酶、过氧化物酶等细胞保护酶的活性，减少膜脂过氧化作用产物丙二醛的积累，降低根系Ｎａ＋和提高根系Ｋ＋ 的向上运输选择性。所有这些变化都有利于缓解盐胁迫对小麦的伤害，提高其对盐胁迫的适应性。

Mitigative Effects of Salicylic Acid and Aspirin on Salt Stress induced Injuries in Wheat (Triticum aestivum L.)

Mitigative effects of salicylic acid and aspirin on salt stress induced injuries during the stage of seed germination and seedling growth were studied in wheat. The results showed that, salicylic acid and aspirin could increase the germination percentage, germination index and vigor index (Fig.1), decrease the leaf relative electric conductivity and salt stress induced injuries of plasma membrane (Table 1), promote the activities of membrane protective enzymes such as superoxide dismutase and peroxidase,and delay the accumulation of malon dialdehyde (Table 2), decrease transportation selectivity of Na , K to shoot (Fig.2). It was also found that under 1.20 % NaCl salt stress, the most suitable concentration of exogenous salicylic acid and aspirin were 0.10, 0.20 g/L respectively. Therefore the injuries caused by salt stress to wheat seed germination and seedling growth were mitigated and the salt tolerance of wheat were raised by exogenous salicylic acid and aspirin.