Euphytica (2015) 204, 121-133

Haichao Jiang, Bin Yan, Taipin Duan, Yibo Li, Guanjun Gao, Qinglu Zhang, Jinghua Xiao, Caiguo Xu, Gonghao Jiang and Yuqing He (2015)
Mapping and evaluating quantitative trait loci for blast resistance under natural infection conditions using an advanced backcross population in rice
Euphytica 204 (1), 121-133
Abstract: Blast (caused by Magnaporthe oryzae B. Couch) is an economically important and mutable disease of rice (Oryza sativa L.). To analyze the genetic mechanism of blast resistance in rice cultivar CR185; we used CR185 as a donor parent to establish a BC₃F₁ and derived BC₃F₂ backcross population in the Zhenshan 97B (ZS97B) background. By challenging the population with natural infection in 2008 and 2009, 11 blast resistance quantitative trait loci (QTLs) were identified. Among them, four major QTLs, qBR-1a, qBR-4d, qBR-6a, and qBR-12a, had large effects during four observation times. QTL effect analyses suggested that resistance increased with the number of QTLs. The major QTL, qBR-6a, which had the largest effect, was fine-mapped to a 100-kb DNA fragment that encompassed the Pi2/Pi9 locus. Sequence comparisons revealed that the Pi allele in CR185 was different from the known alleles of Pi2/Pi9. Our results revealed that accumulation of several QTLs is an effective way to develop highly resistant cultivars.
(The abstract is excluded from the Creative Commons licence and has been copied with permission by the publisher.)
Link to article at publishers website
Database assignments for author(s): Yuqing He

Research topic(s) for pests/diseases/weeds:
resistance/tolerance/defence of host

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Pyricularia oryzae	Rice (Oryza)