关键词: 水分胁迫, 玉米幼苗, 硝酸还原酶, 可溶性蛋白

Abstract: The effects of water-stress on the nitrogen metabolism of maize seedling were studied with different drought-resistance varieties in this paper. The results are as follows:the soluble protein content and nitrate reductase activity in the leaves of maize seedling decline under water-stress. The declining degree in growing leaves is bigger than that in old leaves. The soluble protein content and nitrate reductase activity in roots of maize seedling increase a little after a short water stress, but they decline rapidly when further water-stress continues. The declining degree of soluble protein content and nitrate reductase activity in maize seedling of low drought-resistance variety is larger than that of high drought-resistance variety.

Key words: water-stress, maize seedling, nitrate reductase, soluble protein