不同铁浓度对苹果砧木Fe3+还原酶活性的影响

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＞M26＞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M26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 Fe3+ reductase activity of apple stocks under different Fe concentration

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.