大豆铁素研究 Ⅱ 大豆缺铁胁迫响应

STUDY IN THE IRON OF SOYBEAN Ⅱ. THE STRESS RESPONSE TO IRON DEFICIENCY OF SEYBEAN

铁对大豆叶绿素,抗坏血酸的形成,积累有积极作用。缺铁胁迫大豆过氧化物值增高,硝酸还原酶,过氧化酶等活性下降。叶绿素a、b含量降低。本文发现品种间对缺铁胁迫存在差异,以跃进5号,中油83—19对铁敏感,郑长叶7号较耐。大豆根部过氧化物酶活性高低,与品种特性有关,凡生长发育早或快的品种,根系过氧化物酶活性高峰出现早。

Iron has positive effect on the formation of chlorophyll, and vitamin C of soybean. Iron deficiency can increases the value of peroxide, decreases the nitrate reductase and peroxidase activity. The weakening of self-protection of soybean has a great relationship with the decreasing of nitrate reductase activity and the increasing of the oxidation-reduction potential. These factors influence the effectiveness of the limited iron, so that causes the decreasing of nitrate mebotal-ism; the content of chlorophyll and the quantity of dry matter. The results of the study reveals that there are different responses in different variety to iron deficiency. For example:Great stride 5 and Zhongyou 83-19 have sensitive response to iron deficiency, Zhenchangyie 7 is on the contrary. The peroxidase activity in the root of soybean has a strong relationship with the characters of soybean varieties. The peak of peroxidase activity come out early in the soybean varieties which grow and develop quicker.