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Analysis of rice blast resistance genes by QTL mapping

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Chinese Science Bulletin

Abstract

Resistance to rice blast pathogen mostly shows a quantitative trait controlled by several minor genes. Its complexity and the mutable characteristic of rice blast isolates both hinder the development of the blast resistance research. The article here tried to explore the resistance gene distribution on rice chromosomes and the way of function. Totally 124 QTLs have been identified against 20 isolates using Cartographer software with a ZYQ8/JX17 DH population, which separately are at 100 loci of 72 marker intervals on 12 rice chromosomes. Of them, 16 QTLs were determined by the isolate HB-97-36-1. 82 QTLs (66.13%) are from the resistant parent alleles, ZYQ8, while 42 QTLs (33.87%) are from the susceptible parent alleles, JX17. In comparison of their positions on chromosome, most QTLs are clustered together and distributed nearby the major genes especially the regions on chromosomes 1, 2, 8, 10 and 12. Each QTL could account for the resistance variation between 3.52%–68.64%. And, a positional QTL might display the resistance to several different isolates with different contributions.

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Authors and Affiliations

  1. Institute of Genetics and Developmental Biology, Chinese Academy of Sciences, 100101, Beijing, China

    Jichen Xu & Lihuang Zhu

  2. Institute of Crop Breeding and Cultivation, Chinese Academy of Agricultural Sciences, 100083, Beijing, China

    Jiulin Wang & Zhongzhuan Ling

Authors
  1. Jichen Xu
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  2. Jiulin Wang
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  3. Zhongzhuan Ling
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  4. Lihuang Zhu
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Correspondence to Lihuang Zhu.

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Xu, J., Wang, J., Ling, Z. et al. Analysis of rice blast resistance genes by QTL mapping. Chin.Sci.Bull. 49, 337–342 (2004). https://doi.org/10.1007/BF02900315

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  • DOI: https://doi.org/10.1007/BF02900315

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