705bp dna fragment of mxnrampl gene and full cdna of mxlrtl gene which were related to resist iron stress were cloned by using malus xiaojinensis cheng et jiang - the first iron - efficient genotype in the genus malus in the world as material . ( 1 ) using fragment of nramp gene from wheat and fe ( ll ) - transporter gene fragment of maize ( zmlrt ~ ) as probes , we analysed these genes by blotting hybridization technique in malus xiaojinensis cheng et jiang 本实验以中国农业大学园艺植物研究所筛选到的一个苹果铁高效基因型? ?小金海棠( malusxiaojinensischengetjiang )为试材，分别克隆了小金海棠的抗缺铁相关基因mxnramp1基因的752bp基因组dna片段和fe ( ) -转运蛋白基因( mxirt1 )的cdna全长，为深入探讨小金海棠抗缺铁的分子机理奠定了基础。
