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IbMPK3/IbMPK6-mediated IbSPF1 phosphorylation promotes tolerance to bacterial pathogen in sweetpotato

文献类型： 外文期刊

作者： Kim, Ho Soo 1 ; Bian, Xiaofeng 2 ; Lee, Chan-Ju 1 ; Kim, So-Eun 1 ; Park, Sung-Chul 1 ; Xie, Yizhi 2 ; Guo, Xiaodong 2 ;

作者机构： 1.KRIBB, Plant Syst Engn Res Ctr, 125 Gwahak Ro, Daejeon 34141, South Korea

2.Jiangsu Acad Agr Sci, Prov Key Lab Agrobiol, Inst Food Crops, Nanjing 210014, Jiangsu, Peoples R China

3.UST, KRIBB Sch Biotechnol, Dept Environm Biotechnol, 217 Gajeong Ro, Daejeon 34113, South Korea

关键词： Sweetpotato; Biotic stress; WRKY transcription factor; IbMPK; IbSPF1

期刊名称：PLANT CELL REPORTS （ 影响因子：4.57； 五年影响因子：4.463 ）

ISSN： 0721-7714

年卷期： 2019 年 38 卷 11 期

页码：

收录情况： SCI

摘要： Key message IbSPF1, a novel target of IbMPK3/IbMPK6, regulates biotic stress response in sweetpotato. Environmental stresses due to biotic and abiotic factors negatively affect crop quality and productivity. To minimize the damage caused by these factors, numerous stress signaling pathways are activated in plants. Among these, the mitogen-activated protein kinase (MAPK) signaling cascade plays a pivotal role in diverse plant stress responses. MPK3 and MPK6 function in several cellular signaling pathways by phosphorylating downstream partner proteins in response to environmental stresses. However, little is known about the MPK3/MPK6 signaling pathway in sweetpotato [Ipomoea batatas (L.) Lam]. We recently confirmed that IbMPK3 and IbMPK6, two pathogen-responsive MAPKs, play essential roles in defense gene activation in sweetpotato. In this study, we show that sweetpotato SP8-binding factor (IbSPF1), a substrate of IbMPK3/IbMPK6, functions as a transcriptional regulator of biotic stress signaling in sweetpotato. IbSPF1 specifically interacts with IbMPK3 and IbMPK6, which phosphorylate Ser75 and Ser110 residues of IbSPF1. This increases the affinity of IbSPF1 for the W-box element in target gene promoters. Additionally, the expression of IbSPF1 was up-regulated under various stress conditions and different hormone treatments involved in plant defense responses. Interestingly, the phospho-mimicking mutant of IbSPF1 showed enhanced resistance to Pseudomonas syringae pv. tabaci, and transient expression of mutant IbSPF1 induced the expression of pathogenesis-related genes. These results indicate that the phosphorylation of IbSPF1 by IbMPK3/IbMPK6 plays a critical role in plant immunity by up-regulating the expression of downstream genes.

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