A Gene Encoding a Protein Elicitor of Phytophthora infestans Is Down-Regulated During Infection of Potato

• DOI: 10.1094/mpmi.1997.10.1.13
• Publication Date: 2007-05-11T08:54:42Z
• Authors: Sophien Kamoun; Pieter van West; Anke J. de Jong; Koen E. de Groot; Vivianne G. A. A....; Francine Govers
• Keywords: Phytophthora infestans; Hypersensitive response

Most species of the genus Phytophthora produce 10-kDa extracellular protein elicitors, collectively termed elicitins. Elicitins induce hypersensitive response in a restricted number plants, particularly Nicotiana within Solanaceae family. A cDNA encoding INF1, major secreted elicitin infestans, pathogen solanaceous was isolated and characterized. The expression corresponding inf1 gene during disease cycle P. infestans analyzed. shown to be expressed mycelium grown various culture media, whereas it not sporangiospores, zoospores, cysts, germinating cysts. In planta, infection potato, biotrophic stage, down-regulated compared vitro. highest levels were observed vitro late stages when profuse sporulation leaf necrosis occur. potential role INF1 as an elicitor interactions between Solanum investigated. Nineteen lines, representing nine with resistance tested for Escherichia coli INF1. Within Solanum, did appear mediated by defense elicited However, recognition could component nonhost tobacco infestans.