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Isolation, molecular characterization, and mapping of four rose MLO orthologs

文献类型： 外文期刊

作者： Kaufmann, Helgard 1 ; Qiu, Xianqin 2 ; Wehmeyer, Juliane 1 ; Debener, Thomas 1 ;

作者机构： 1.Leibniz Univ Hannover, Dept Mol Breeding, Inst Plant Genet, D-30419 Hannover, Germany

2.Yunnan Acad Agr Sci, Flower Res Inst, Yunnan Flower Breeding Lab, Kunming, Peoples R China

关键词： powdery mildew;mildew resistance locus o;Podosphaera pannosa;rosaceae;tetraploid

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.753； 五年影响因子：6.612 ）

ISSN： 1664-462X

年卷期： 2012 年 3 卷

页码：

收录情况： SCI

摘要： Powdery mildew is a major disease of economic importance in cut and pot roses. As an alternative to conventional resistance breeding strategies utilizing single-dominant genes or QTLs, mildew resistance locus o (MLO)-based resistance might offer some advantages. In dicots such as Arabidopsis, pea, and tomato, loss-of-function mutations in MLO genes confer high levels of broad-spectrum resistance. Here, we report the isolation and characterization of four MLO homologs from a large rose EST collection isolated from leaves. These genes are phylogenetically closely related to other dicot MLO genes that are involved in plant powdery mildew interactions. Therefore, they are candidates for MLO genes involved in rose powdery mildew interactions. Two of the four isolated genes contain all of the sequence signatures considered to be diagnostic for MLO genes. We mapped all four genes to three linkage groups and conducted the first analysis of alternative alleles. This information is discussed in regards to a reverse genetics approach aimed at the selection of rose plants that are homozygous for loss-of-function in one or more MLO genes.

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[2]Antisense RhMLO1 Gene Transformation Enhances Resistance to the Powdery Mildew Pathogen in Rosa multiflora. Qiu, Xianqin,Bao, Manzhu,Qiu, Xianqin,Wang, Qigang,Zhang, Hao,Jian, Hongying,Zhou, Ningning,Ji, Cheng,Yan, Huijun,Tang, Kaixue.

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