两种蔬菜对硝态氮的累积和还原

将粗厚山羊草（６Ｘ）、牡山羊草、瓦维洛夫山羊草等Ｄ２型异源细胞质导入普通小麦，研究它们对普通小麦籽粒品质的的影响。结果表明，Ｄ２型细胞质对提高蛋白质和湿面筋含量的作用很明显；对干面筋含量的影响因品种本身含量高低而不同，对低面筋含量品种的提高作用较大；对沉淀值的影响主要因核型不同而异。认为将Ｄ２型异源细胞质导入普通小麦是一条有效的品质改良途径。

The Accumulated and Reduction of Nitrate in Two Vegetable Plants

Field experiments were carried out on vegetable garden soil from 1994 to 1995.The results obtained showed that the nitrate accumulated in spinach was significantly lower than that in Chinese cabbage,nitrate content in the latter being 1.2 to 4.3 times that in the former.The nitrate reductase activities of spinach outside blades were a bit lower than those of Chinese cabbage,but they were all higher in other organs and whole spinach plant.The nitrate in spinach mainly distributed in stems,petioles and outside blades,and so did the nitrate reductase activities.However,the nitrate in Chinese cabbage mainly distributed in petioles and outside blades,whereas the activities of nitrate reductase concentrated in outside blades.Nitrate reductase activity and its distribution were the major causes for the differences of nitrate accumulation between the two vegetables.