用 5 0mg/L水杨酸 (SA)浸种处理后 ,水稻根系生长受到明显促进。幼苗经 5 0mg/LSA诱导处理 2 4h后 ,体内的硝酸还原酶活性 (NRA)显著增强。与此相一致的是 ,5 0mg/LSA处理不仅能提高幼苗内源细胞分裂素和生长素的水平 ,还可以降低脱落酸的含量。提示SA对硝酸还原酶活性的诱导作用可能是通过调节内源激素的水平来实现的。 After soaking seeds with 50 mg / L salicylic acid (SA), the root growth of rice was obviously promoted. After the seedlings were treated with 50 mg / L LSA for 24 h, the nitrate reductase activity (NRA) was significantly increased in vivo. Consistent with this, 50mg / LSA treatment not only increased the level of endogenous cytokinin and auxin in seedlings, but also decreased the content of abscisic acid. It is suggested that the induction effect of SA on nitrate reductase activity may be achieved by regulating the levels of endogenous hormones.