本文以冬小麦品种渭麦4号为材料,综合研究了水分胁迫对其氮代谢的影响。结果表明,水分胁迫使小麦叶片硝酸还原酶活性显著降低,而蛋白酶、肽酶和核糖核酸酶活性却显著增强,致使蛋白质和RNA分解加剧,含量降低,并且总氮、游离氨基酸含量及其组分也发生了变化。DNA含量则不受土壤含水量高于萎蔫点的水分胁迫影响。 In this paper, a wheat winter wheat variety Weimai 4 was used to study the effects of water stress on its nitrogen metabolism. The results showed that under water stress, the nitrate reductase activity of wheat leaves was significantly decreased, while the activities of protease, peptidase and ribonuclease were significantly increased, which led to the aggravation of protein and RNA degradation and the decrease of total nitrogen and free amino acids and their components Also changed. DNA content is not affected by water stress with higher soil water content than wilting point.