Identification of brown planthopper resistance gene Bph32 in the progeny of a rice dominant genic male sterile recurrent population using genome-wide association study and RNA-seq analysis

文献类型： 外文期刊

第一作者： Xiao, Yinghui

作者： Xiao, Yinghui;Pan, Yi;Song, Shufeng;Hu, Meixia;Chang, Shuoqi;Lv, Qiming;Li, Yixing;Wang, Tiankang;Ouyang, Xiang;Fu, Xiqin;Pan, Yi;Xiao, Yinghui;Pan, Yi;Xiao, Yinghui;Huang, Ling

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关键词： Rice; Dominant genic male sterile; BPH; Mapping; RNA-seq analysis

期刊名称：MOLECULAR BREEDING （ 影响因子：2.589； 五年影响因子：2.75 ）

ISSN： 1380-3743

年卷期： 2019 年 39 卷 5 期

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收录情况： SCI

摘要： Brown planthopper (BPH) is one of the most damaging pests of rice. Improving the resistance of rice varieties is considered a safe and effective way to control this pest. Here, a field experiment was conducted to test BPH resistance in a rice population developed by recurrent selection of a variety with dominant genic male sterility. Three high-resistance lines were identified and subjected to a genome-wide association study (GWAS), which mapped the BPH resistance gene to the short arm of chromosome 6. One highly resistant line (14CF2426) was further crossed with Taichuang Native 1 (TN1) to construct an F-2 segregating population. Artificial insect infestation identified three quantitative trait loci (QTLs), which were mapped to chromosomes 1, 6, and 10; the QTL on chromosome 6 of 14CF2426 contained a known resistance gene, Bph32. Near-isogenic lines NIL-Bph32 and NIL-bph32 of Bph32 were constructed using molecular marker-assisted selection. RNA sequencing (RNA-seq) detected 1268 differentially expressed genes (DEGs) between the two near-isogenic lines. Compared with NIL-Bph32, 1064 genes were upregulated and 204 were downregulated in NIL-bph32. Gene ontology (GO) enrichment analysis detected 46 significantly enriched terms, and KEGG analysis revealed four significantly enriched metabolic pathways. This robust multi-method strategy showed that combining GWAS analysis with a dominant genic male sterile recurrent rice population can significantly improve the efficiency of gene identification. RNA-seq revealed some candidate genes with a potential regulatory function in BPH resistance, thus providing insights into the transcriptional regulatory network and the molecular mechanisms of resistance.

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