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High-resolution mapping and characterization of qRgls2, a major quantitative trait locus involved in maize resistance to gray leaf spot

文献类型： 外文期刊

作者： Xu, Ling 1 ; Zhang, Yan 1 ; Shao, Siquan 2 ; Chen, Wei 3 ; Tan, Jing 3 ; Zhu, Mang 1 ; Zhong, Tao 1 ; Fan, Xingming 3 ; Xu, 1 ;

作者机构： 1.China Agr Univ, Natl Maize Improvement Ctr China, Beijing 100193, Peoples R China

2.Baoshan Inst Agr Sci, Baoshan 678000, Peoples R China

3.Yunnan Acad Agr Sci, Inst Food Crops, Kunming 650205, Peoples R China

关键词： Maize;GLS;QTL;Fine-mapping;Candidate genes

期刊名称：BMC PLANT BIOLOGY （ 影响因子：4.215； 五年影响因子：4.96 ）

ISSN： 1471-2229

年卷期： 2014 年 14 卷

页码：

收录情况： SCI

摘要： Background: Gray leaf spot (GLS) caused by Cercospora zeae-maydis (Czm) or Cercospora zeina (Cz) is a devastating maize disease and results in substantial yield reductions worldwide. GLS resistance is a quantitatively inherited trait. The development and cultivation of GLS-resistant maize hybrids are the most cost-effective and efficient ways to control this disease. Results: We previously detected a major GLS resistance QTL, qRgls2, in bin 5.03-04, which spans the whole centromere of chromosome 5 encompassing a physical distance of similar to 110-Mb. With advanced backcross populations derived from the cross between the resistant Y32 and susceptible Q11 inbred lines, a sequential recombinant-derived progeny testing strategy was adapted to fine map qRgls2. We narrowed the region of qRgls2 from an initial similar to 110-Mb to an interval of similar to 1-Mb, flanked by the markers G346 and DD11. qRgls2 showed predominantly additive genetic effects and significantly increased the resistance percentage by 20.6 to 24.6% across multiple generations. A total of 15 genes were predicted in the mapped region according to the 5b.60 annotation of the maize B73 genome v2. Two pieces of the mapped qRgls2 region shared collinearity with two distant segments on maize chromosome 4. Conclusions: qRgls2, a major QTL involved in GLS resistance, was mapped to a similar to 1-Mb region close to the centromere of chromosome 5. There are 15 predicted genes in the mapped region. It is assumed that qRgls2 could be widely used to improve maize resistance to GLS.

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