Mapping quantitative trait loci for sheath blight disease resistance in Yangdao 4 rice

文献类型： 外文期刊

第一作者： Wen, Z. H.

作者： Wen, Z. H.;Zeng, Y. X.;Ji, Z. J.;Yang, C. D.

作者机构：

关键词： Quantitative trait locus;Rice (Oryza sativa L.);Sheath blight (ShB);ShB-resistant cultivars

期刊名称：GENETICS AND MOLECULAR RESEARCH （ 影响因子：0.764； 五年影响因子：0.912 ）

ISSN： 1676-5680

年卷期： 2015 年 14 卷 1 期

页码：

收录情况： SCI

摘要： Rice sheath blight (ShB), which is caused by Rhizoctonia solani, has become the most serious rice disease in China. Yangdao 4, a cultivar with partial resistance to ShB, was crossed with Lemont, a susceptible cultivar, to develop mapping populations that were used to analyze quantitative trait loci (QTL) that confer resistance to ShB. QTL analysis were performed in 3 environments (E1-E3) using 2 F2 and 1 F2: 3 populations, respectively. Three traits were recorded to evaluate ShB resistance, including disease rating (DR), lesion height (LH), and percentage of lesion height (PLH). Based on field evaluation of ShB resistance and the 2 genetic maps constructed, we identified a total of 8 QTLs for DR (4 in E1, 4 in E2, and 3 in E3), 6 QTLs for LH (1 in E1, 3 in E2, and 2 in E3), and 7 QTLs for PLH (1 in E1, 4 in E2, and 2 in E3). Sixteen of the ShB-QTLs co-localized as 6 clusters on chromosomes 3, 7, 11, and 12. Four of the 6 clusters contained ShB-QTLs that were detected in 2 environments, while the other 2 clusters with ShB-QTLs were detected in 1 environment. Three ShB-QTLs (qSBD-3-2, qSBL-3-1, and qSBPL-3-1) were delimited to a 581-kb region flanked by markers D333B and D334 on chromosome 3. The resistance alleles of Yangdao 4 at the qSBD-3-2 locus decreased DR by 0.68 and 0.79 in E2 and E3, respectively.

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