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Comparative transcriptome profiling of a rice line carrying Xa39 and its parents triggered by Xanthomonas oryzae pv. oryzae provides novel insights into the broad-spectrum hypersensitive response

文献类型： 外文期刊

作者： Zhang, Fan 1 ; Huang, Li-Yu 1 ; Zhang, Fan 1 ; Ali, Jauhar 3 ; Cruz, Casiana Vera 3 ; Zhuo, Da-Long 1 ; Du, Zheng-Lin; 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Crop Sci, Natl Key Facil Crop Gene Resources & Genet Improv, Beijing 100081, Peoples R China

2.Yunnan Acad Agr Sci, Food Crops Res Inst, Kunming 650250, Yunnan, Peoples R China

3.Int Rice Res Inst, Manila, Philippines

4.Chinese Acad Sci, Beijing Inst Gen, Beijing 100029, Peoples R China

关键词： Rice;Xanthomonas oryzae pv. oryzae;R gene;Transcriptome sequencing

期刊名称：BMC GENOMICS （ 影响因子：3.969； 五年影响因子：4.478 ）

ISSN： 1471-2164

年卷期： 2015 年 16 卷

页码：

收录情况： SCI

摘要： Background: Bacterial blight, caused by Xanthomonas oryzae pv. oryzae (Xoo), is a devastating rice disease worldwide. Xa39 is a resistance (R) gene with a broad-spectrum hypersensitive response (BSHR) to Xoo. Nevertheless, the molecular mechanisms of resistance mediated by Xa39 remain unclear. In this study, the transcriptome profiling of a rice line carrying Xa39 and its parents at the early stage of Xoo infection were investigated. Results: A rice introgression line H471 carrying Xa39 exhibited a typical local hypersensitive response phenotype, accompanied by programmed cell death after inoculation with the Xoo Philippines' race 9b. Transcriptome profiling of H471 and its parents at 1 and 2 days post-inoculation was performed using RNA sequencing. In total, 306 differentially expressed genes (DEGs) were identified in H471 compared with its recurrent parent Huang-Hua-Zhan after inoculation with Xoo. Among them, 121 (39.5%) genes, with functional enrichments that were related to defense response, protein amino acid phosphorylation, and apoptosis, were found to be constitutively expressed. The other 185 (60.5%) genes, with GO terms that belonged to defense response, were significantly responsive to Xoo infection in H471. Ten up-regulated and 12 down-regulated genes encoding intracellular immune receptors were identified in H471 compared with Huang-Hua-Zhan. LOC_Os11g37759, which was located in the fine-mapping region harboring Xa39, is a Xa39 candidate gene. The putative BSHR-related co-regulatory networks were constructed using 33 DEGs from four functional groups, including gibberellic acid receptors and brassinosteroid regulators, which were differentially co-expressed with LOC_Os11g37759 in infected H471. Our results indicated that there might be cross-talk between the Xa39-mediated signal transduction cascades and the GA/BR signaling pathway, and that the defense mechanism was related to diverse kinases, transcription factors, post-translational regulation, and R genes. Conclusions: The present study provides the comprehensive transcriptome profile of a rice introgression line carrying Xa39 and its parents, and identifies a set of DEGs involved in BSHR mediated by Xa39. These data provide novel insights into the regulatory networks of plant disease resistance mediated by R genes, and the identified DEGs will serve as candidates for Xa39 cloning and for further understanding the molecular mechanism of BSHR.

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