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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 ~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 ~110-Mb to an interval of ~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 ~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.    Electronic supplementary material  The online version of this article (doi:10.1186/s12870-014-0230-6) contains supplementary material, which is available to authorized users.

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