Chinese Bulletin of Botany ›› 2015, Vol. 50 ›› Issue (6): 691-698.DOI: 10.11983/CBB15050

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Quantitative Trait Loci Analysis of Rice Blast Resistance in Japonica Rice Variety Ziyu44

Rong Zhou, Bo Wang , Rui Yang, Shu Li, Linlin Fan, Qianchun Zeng, Qiong Luo*   

  1. Ministry of Education Key Laboratory of Agriculture Biodiversity for Plant Disease Management, Yunnan Agricultural University, Kunming 650201, China
  • Received:2015-03-12 Accepted:2015-06-05 Online:2015-11-01 Published:2015-09-06
  • Contact: Luo Qiong
  • About author:

    ? These authors contributed equally to this paper

Abstract: Rice blast, caused by Magnaporthe oryzae, is one of the most destructive diseases of rice worldwide. The development and use of resistant cultivars is considered the most economic, effective and environment-friendly method to control this disease. To understand the molecular mechanism of Ziyu44 for durable rice blast resistance, we inoculated 212 F7 recombinant inbred lines (F7RILs) derived from a cross between Ziyu44 and Jiangnan Xiangnuo (JNXN), a susceptible cultivar, naturally with Magnaporthe oryzae to evaluate rice field leaf-blast resistance. We detected 13 quantitative trait locus (QTLs) on chromosomes 1, 2, 6, 8 and 12. The resulting phenotypic variation due to a single QTL ranged from 5.8% to 21.9%. The QTL on chromosome 8 between simple sequence repeat markers RM72 and RM404 accounted for approximately 61.9% of the total phenotypic variation, which may be a major QTL locus. Durable resistance to rice blast in Ziyu44 may be due to the combination of major and minor resistance on multiple loci.