【摘要】 用不同浓度NaCl溶液处理玉米幼苗,4周后测定的结果表明,5、10mmol·L-1NaCl促进玉米生长,主要表现在:光合速率增大,磷酸烯醇式丙酮酸羧化酶和苹果酸脱氢酶活性增强,细胞质膜透性降低,超氧物歧化酶和过氧化氢酶活性增加,丙二醛、游离氨基酸和可溶性糖含量降低,蛋白质含量增加,最终导致干重增加。更多还原

【Abstract】 Seedlings of Zea mays L. cultured with Hoagland nutrient solutions were treated with different lowconcentrations of NaCl. The changes in dry weight, photosynthetic rate, the contents of free amino acid,soluble sugars, protein, malondialdehyde (MDA) and chlorophyll, membrane permeability and the activities ofsuperoxide dismutase (SOD), catalase (CAT), malic dehydrogenase (MDH), phosphoenolpyruvate carboxylase(PEPCase) and nitrate reductase (NR) were determined. The results showed that the growth of Z. mays waspromoted by 5 and 10 mmol·L-1 NaCl. The photosynthetic rate, activities of PEPCase and MDH of Z. maysincreased under low NaCl concentration, but the MDA content and membrane permeability decreased underlow NaCl concentration treatment, on the contrary, the activities of SOD and CAT were promoted, the freeamino acid and soluble sugar content decreased. All the changes led to the increase in dry weight of Z. maysunder low NaCl concentration.更多还原