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Wall-associated kinase BrWAK1 confers resistance to downy mildew in Brassica rapa

文献类型： 外文期刊

作者： Zhang, Bin 1 ; Su, Tongbing 1 ; Xin, Xiaoyun 1 ; Li, Peirong 1 ; Wang, Jiao 1 ; Wang, Weihong 1 ; Yu, Yangjun 1 ; Zhao, Xiuyun 1 ; Zhang, Deshuang 1 ; Li, Dayong 1 ; Zhang, Fenglan 1 ; Yu, Shuancang 1 ;

作者机构： 1.Beijing Acad Agr & Forestry Sci BAAFS, Beijing Vegetable Res Ctr, Beijing, Peoples R China

2.Minist Agr, Key Lab Biol & Genet Improvement Hort Crops North, Beijing, Peoples R China

3.Beijing Key Lab Vegetable Germplasm Improvement, Beijing, Peoples R China

4.State Key Lab Vegetable Biobreeding, Beijing, Peoples R China

关键词： Brassica rapa; QTL; Downy mildew; Wall-associated kinase; BrWAK1

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：13.8； 五年影响因子：13.2 ）

ISSN： 1467-7644

年卷期： 2023 年

页码：

收录情况： SCI

摘要： The plant cell wall is the first line of defence against physical damage and pathogen attack. Wall-associated kinase (WAK) has the ability to perceive the changes in the cell wall matrix and transform signals into the cytoplasm, being involved in plant development and the defence response. Downy mildew, caused by Hyaloperonospora brassicae, can result in a massive loss in Chinese cabbage (Brassica rapa L. ssp. pekinensis) production. Herein, we identified a candidate resistant WAK gene, BrWAK1, in a major resistant quantitative trait locus, using a double haploid population derived from resistant inbred line T12-19 and the susceptible line 91-112. The expression of BrWAK1 could be induced by salicylic acid and pathogen inoculation. Expression of BrWAK1 in 91-112 could significantly enhance resistance to the pathogen, while truncating BrWAK1 in T12-19 increased disease susceptibility. Variation in the extracellular galacturonan binding (GUB) domain of BrWAK1 was found to mainly confer resistance to downy mildew in T12-19. Moreover, BrWAK1 was proved to interact with BrBAK1 (brassinosteroid insensitive 1 associated kinase), resulting in the activation of the downstream mitogen-activated protein kinase (MAPK) cascade to trigger the defence response. BrWAK1 is the first identified and thoroughly characterized WAK gene conferring disease resistance in Chinese cabbage, and the plant biomass is not significantly influenced by BrWAK1, which will greatly accelerate Chinese cabbage breeding for downy mildew resistance.

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