不同铁浓度对苹果砧木Fe^(3+)还原酶活性的影响

Effect on Fe^(3+) reductase activity of apple stocks under different Fe concentration

通过营养液培养的方法 ,研究了不同铁浓度处理对 4种苹果砧木植物铁含量以及根系Fe3 + 还原酶活性的影响。结果表明 ,缺铁导致砧木根系Fe3 + 还原酶活性增加。砧木种类不同 ,培养溶液中铁浓度不同 ,Fe3 + 还原酶活性也有所不同。随着培养液中铁浓度的增加 ,根中Fe3 + 还原酶活性逐渐降低。在缺铁胁迫条件下 ,各砧木根系中Fe3 + 还原酶活性达最高水平 ,即小金海棠 >M2 6>八棱海棠 >SH40 。在最适铁浓度水平下 ,SH40 和八棱海棠根系中铁含量高于枝叶中铁含量 ,对缺铁较敏感 ,容易表现缺铁黄化现象。而小金海棠和M2 6根系中铁含量低于枝叶中铁含量 ,对缺铁不敏感 ,不易表现出缺铁黄化现象。

Effect on Fe^(3+) reductase activity in four apple stocks root under different Fe concentration was studied with nutrient solution culture.The results showed that iron deficiency induced an increase in Fe^(3+) reductase activity in roots.The Fe^(3+) reductase activity was different with stock species and Fe concentration. With Fe concentration increasing, the Fe^(3+) reductase activity gradually decreased. The Fe^(3+) reductase activity in different stock roots reached tiptop level under Fe-stress,Malus.xiaojinesis chen et Jiang>M_(26)>M.micromalus Markin>SH_(40). SH_(40),M.micromalus Markin which the Fe contents in roots was higher than shoots under the proper Fe concentration was sensitive to iron-deficiency and easily manifested chlorisis phenomena. But M.xiaojinesis chen et Jiang and M_(26) which the Fe contents in roots was lower than shoots under the proper Fe concentration was not sensitive to iron-deficiency and not easily manifested chlorisis phenomena.