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Plant Cell

Title:		"Tomato PEPR1 ORTHOLOG RECEPTOR-LIKE KINASE1 Regulates Responses to Systemin, Necrotrophic Fungi, and Insect Herbivory"
Author(s):		Xu S; Liao CJ; Jaiswal N; Lee S; Yun DJ; Lee SY; Garvey M; Kaplan I; Mengiste T;
Address:		"Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907. Department of Biomedical Science and Engineering, Konkuk University, Gwangjin-gu, Seoul 05029, South Korea. Division of Applied Life Sciences (BK 21 Program), Gyeongsang National University, Jinju City 660-701, Korea. Department of Entomology, Smith Hall, Purdue University, West Lafayette, Indiana 47907-2089. Department of Botany and Plant Pathology, Purdue University, West Lafayette, Indiana 47907 mengiste@purdue.edu"
Journal Title:		Plant Cell
Year:		2018
Volume:		20180821
Issue:		9
Page Number:		2214 - 2229
DOI:		10.1105/tpc.17.00908
ISSN/ISBN:		1532-298X (Electronic) 1040-4651 (Print) 1040-4651 (Linking)
Abstract:		"Endogenous peptides regulate plant immunity and growth. Systemin, a peptide specific to the Solanaceae, is known for its functions in plant responses to insect herbivory and pathogen infections. Here, we describe the identification of the tomato (Solanum lycopersicum) PEPR1/2 ORTHOLOG RECEPTOR-LIKE KINASE1 (PORK1) as the TOMATO PROTEIN KINASE1b (TPK1b) interacting protein and demonstrate its biological functions in systemin signaling and tomato immune responses. Tomato PORK1 RNA interference (RNAi) plants with significantly reduced PORK1 expression showed increased susceptibility to tobacco hornworm (Manduca sexta), reduced seedling growth sensitivity to the systemin peptide, and compromised systemin-mediated resistance to Botrytis cinerea. Systemin-induced expression of Proteinase Inhibitor II (PI-II), a classical marker for systemin signaling, was abrogated in PORK1 RNAi plants. Similarly, in response to systemin and wounding, the expression of jasmonate pathway genes was attenuated in PORK1 RNAi plants. TPK1b, a key regulator of tomato defense against B. cinerea and M. sexta, was phosphorylated by PORK1. Interestingly, wounding- and systemin-induced phosphorylation of TPK1b was attenuated when PORK1 expression was suppressed. Our data suggest that resistance to B. cinerea and M. sexta is dependent on PORK1-mediated responses to systemin and subsequent phosphorylation of TPK1b. Altogether, PORK1 regulates tomato systemin, wounding, and immune responses"
Keywords:		"Animals Botrytis/pathogenicity Cyclopentanes/metabolism Gene Expression Regulation, Plant Solanum lycopersicum/*metabolism/microbiology/parasitology Manduca/pathogenicity Oxylipins/metabolism Plant Immunity/physiology Plant Proteins/genetics/*metabolism;"
Notes:		"MedlineXu, Siming Liao, Chao-Jan Jaiswal, Namrata Lee, Sanghun Yun, Dae-Jin Lee, Sang Yeol Garvey, Michael Kaplan, Ian Mengiste, Tesfaye eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. England 2018/08/23 Plant Cell. 2018 Sep; 30(9):2214-2229. doi: 10.1105/tpc.17.00908. Epub 2018 Aug 21"