数字农科院2.0

Characterization and Genetic Analysis of a Novel Rice Spotted-leaf Mutant HM47 with Broad-spectrum Resistance to Xanthomonas oryzae pv. oryzae

文献类型: 外文期刊

作者: Bao-Hua Feng ; Yang Yang +; Yong-Feng Shi ; Hai-Chao Shen ; Hui-Mei Wang ; Qi-Na Huang ; Xia Xu ; Xiang-Guang Lv ; Jian-Li Wu *

作者机构:

关键词: Rice;broad-spectrum disease resistance;physical map;pathogenesis-related genes;spotted-leaf

期刊名称: Journal of Integrative Plant Biology

ISSN: 1672-9072

年卷期: 2013 年 55 卷 5 期

页码:

收录情况: JCR(2021版) ; CSCD(2020-2021年度) ; 科技核心(2020版)

摘要: A stable inherited rice spotted-leaf mutant HM47 derived from an EMS-induced IR64 mutant bank was identified. The mutant expressed hypersensitive response (HR)-like symptoms throughout its whole life from the first leaf to the flag leaf, without pathogen invasion. Initiation of the lesions was induced by light under natural summer field conditions. Expression of pathogenesis-related genes including PAL, PO-C1, POX22.3 and PBZ1 was enhanced significantly in association with cell death and accumulation of H2O2 at and around the site of lesions in the mutant in contrast to that in the wild-type (WT). Disease reaction to Xanthomonas oryzae pv. oryzae from the Philippines and China showed that HM47 is a broad-spectrum disease-resistant mutant with enhanced resistance to multiple races of bacterial blight pathogens tested. An F2 progeny test showed that bacterial blight resistance to race HB-17 was co-segregated with the expression of lesions. Genetic analysis indicated that the spotted-leaf trait was controlled by a single recessive gene, tentatively named splHM47, flanked by two insertion/deletion markers in a region of approximately 74 kb on the long arm of chromosome 4. Ten open reading frames are predicted, and all of them are expressed proteins. Isolation and validation of the putative genes are currently underway.

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