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Published on March 25, 2009; 10.1104/pp.109.136762

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Received February 6, 2009
Accepted March 17, 2009

Genetic Dissection Of Verticillium Wilt Resistance Mediated By Tomato Ve1

Emilie F. Fradin , Zhao Zhang , Juan C. Juarez Ayala , Christian C.M. Castroverde , Ross N. Nazar , Jane Robb , Chun-Ming Liu , and Bart P.H.J. Thomma *

Laboratory of Phytopathology, Wageningen University, Binnenhaven 5, 6709 PD, Wageningen, The Netherlands; Centre for BioSystems Genomics (CBSG), P.O. Box 98, 6700 AB Wageningen, The Netherlands; Center for Signal Transduction and Metabolomics, Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China; Department of Molecular and Cellular Biology, University of Guelph, Guelph, ON, Canada, N1G 2W1

* Corresponding author; email: bart.thomma{at}wur.nl.

Vascular wilt diseases caused by soil-borne pathogens are among the most devastating plant diseases worldwide. The Verticillium genus includes vascular wilt pathogens with a wide host range. Although V. longisporum infects various hosts belonging to the Cruciferaceae, V. dahliae and V. albo-atrum cause vascular wilt diseases in over 200 dicotyledonous species including economically important crops. A locus responsible for resistance against race 1 strains of V. dahliae and V. albo-atrum has been cloned from tomato (Solanum lycopersicum) only. This locus, known as Ve, comprises two closely linked inversely oriented genes, Ve1 and Ve2, that encode cell surface receptor proteins of the extracellular leucine-rich repeat (eLRR) receptor-like protein (RLP) class of disease resistance proteins. Here, we show that Ve1, but not Ve2, provides resistance in tomato against race 1 strains of V. dahliae and V. albo-atrum, and not against race 2 strains. Using virus-induced gene silencing in tomato, the signaling cascade downstream of Ve1 is shown to require both EDS1 and NDR1. In addition, also NRC1, ACIF, MEK2, and SERK3/BAK1 act as positive regulators of Ve1 in tomato. In conclusion, Ve1-mediated resistance signaling only partially overlaps with signaling mediated by Cf proteins, type members of the RLP-class of resistance proteins.






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