三种铁素对小麦幼芽的生长及生理生化特征的影响

Effect of Three Kinds of Iron on the Growth and Physiological and Biochemical Characteristics of Wheat Bud

不同形态铁素具有不同的生物活性,对植物产生不同的影响。通过测定小麦幼芽根芽叶的生长指标和其中丙二醛的含量,探究了FeSO4、EDTA-Fe、AA-Fe对小麦幼芽生长及生理生化特征的影响。结果表明,三种铁盐在低浓度时促进了小麦幼芽根和芽的伸长,而高浓度铁盐则抑制根和芽的伸长及生物量。同浓度时三种铁盐的根伸长抑制率为AA-Fe>FeSO4>EDTA-Fe。小麦幼芽根与芽叶组织中丙二醛浓度随着外源铁盐浓度的提高而提高,FeSO4与EDTA-Fe处理高浓度时略有降低。丙二醛浓度在根的变化幅度均大于芽叶,根质膜系统对铁盐的响应度高于芽叶。

Different kinds of iron have different biological activity, and generate effects on plants differently. The effect of three kinds of iron, FeSO4, EDTA-Fe,AA-Fe,on the growth and physiological and biochemical characteristics of wheat bud was studied by measuring the growth index and malondialdehyde concentration in bud and root of wheat. The results showed that the elongation of wheat bud and root could be promoted by ferric salt at relatively low concentration, while inhibited at high concentration. At the same concentration, inhibition rate of ferric salt on the elongation of wheat root was AA-Fe 〉 FeSO4 〉 EDTA-Fe. With the concentration of ferric salt increasing,the concentration of malondialdehyde in wheat root and bud increased,but it dropped in FeSO4 and EDTA-Fe treatment when the concentration was very high. The change bound of malondialdehyde concentration in root was wider than in shoot, which indicated that the response degree to ferric salt of root membrane system was greater than that of bud membrane system.