中文摘要：

从铁高效基因型小金海棠（Malus xiaojinensis）中克隆了Fe^3＋-还原酶基因MxFRO。半定量RT-PCR结果表明MxFRO在小金海棠的根和叶中均受缺铁胁迫诱导。将MxFRO转入野生型酵母（Saccharomyces cerevisiae）中，结果表明转基因酵母的Fe^＋-还原酶活性是对照的2．8倍，实验初步证明MxFRO基因编码的蛋白具有Fe^3＋-还原酶活性。

英文摘要：

Full-length cDNA sequence of MxFRO was cloned from Malus xiaojinensis, an iron-efficient genotype in the genus Malus. The results analysed by semiquantitative RT-PCR showed that MxFRO was induced by iron-deficiency stress in roots and leaves. The MxFRO gene was transformed into yeast（Saccharomyces cerevisiae）, and the ferric reductase activity in transgenic yeast was 2.8-fold higher than that in controls, indicating that MxFRO protein has ferric reductase activity.