Abstract: Tomato and maize seedlings were cultured in three kinds of solution (with K nil Na, with Na nil K, nil Na nil K) to evaluate the effects of Na or K on the growth and some physiological indexes of tomato and maize. The results showed that the contents of free proline of tomato and maize were lower and the contents of soluble sugars and the ratio of chla to chlb were higher when cultured in the solution with Na nil K than those cultured in the solution nil Na and nil K included. Na could promote the activity of peroxidase. It is concluded that Na instead of K can promote the growth of tomato and maize to a certain degree.

Key words: tomato, maize, Na, K, free proline, soluble sugar, peroxidase, chlorophyll

摘要： 在有K无Na、有Na无K、无K无Na三种培养液中培养番茄和玉米幼苗,试验表明,在有Na无K液的培养下,番茄和玉米幼苗叶片游离脯氨酸含量比无K无Na溶液培养的低;可溶性糖含量和叶绿素a/b比值比无K无Na溶液培养的高;Na可以提高过氧化物酶活性。因此,在一定程度上Na可代替K对番茄、玉米幼苗的生长起促进作用。

关键词: 番茄, 玉米, Na, K, 游离脯氨酸, 可溶性糖, 过氧化物酶, 叶绿素