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Identification of QTL for maize resistance to common smut by using recombinant inbred lines developed from the Chinese hybrid Yuyu22

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Abstract

Common smut in maize, caused byUstilago maydis, reduces grain yield greatly. Agronomic and chemical approaches to control such diseases are often impractical or ineffective. Resistance breeding could be an efficient approach to minimize the losses caused by common smut. In this study, quantitative trait loci (QTL) for resistance to common smut in maize were identified. In 2005, a recombinant inbred line (RIL) population along with the resistant (Zong 3) and susceptible (87-1) parents were planted in Beijing and Zhengzhou. Significant genotypic variation in resistance to common smut was observed at both locations after artificial inoculation by injecting inoculum into the whorl of plants with a modified hog vaccinator. Basing on a genetic map containing 246 polymorphic SSR markers with an average linkage distance of 9.11 cM, resistance QTL were analysed by composite interval mapping. Six additive-effect QTL associated with resistance to common smut were identified on chromosomes 3 (three QTL), 5 (one QTL) and 8 (two QTL), and explained 3.2% to 12.4% of the phenotypic variation. Among the 6 QTL, 4 showed significant QTL × environment (Q × E) interaction effects, which accounted for 1.2% to 2.5% of the phenotypic variation. Nine pairs of epistatic interactions were also detected, involving 18 loci distributed on all chromosomes except 2, 6 and 10, which contributed 0.8% to 3.0% of the observed phenotypic variation. However, no significant epistasis × environment interactions were detected. In total, additive QTL effects and Q × E interactions explained 38.8% and 8.0% of the phenotypic variation, respectively. Epistatic effects contributed 15% of the phenotypic variation. The results showed that besides the additive QTL, both epistasis and Q × E interactions formed an important genetic basis for the resistance toUstilago maydis in maize.

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Authors and Affiliations

  1. National Maize Improvement Centre of China, China Agricultural University, Yuanmingyuan West Road, Haidian, 100094, Beijing, China

    Jun-qiang Ding, Subhash Chander & Jian-sheng Li

  2. Crop Research Institute, Chinese Academy of Agricultural Sciences, China

    Xiao-ming Wang

Authors
  1. Jun-qiang Ding
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  2. Xiao-ming Wang
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  3. Subhash Chander
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  4. Jian-sheng Li
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Correspondence to Jian-sheng Li.

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Ding, Jq., Wang, Xm., Chander, S. et al. Identification of QTL for maize resistance to common smut by using recombinant inbred lines developed from the Chinese hybrid Yuyu22. J Appl Genet 49, 147–154 (2008). https://doi.org/10.1007/BF03195608

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  • DOI: https://doi.org/10.1007/BF03195608

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