Plant Physiology Preview
Published on August 6, 2004; 10.1104/pp.104.044859
Received April 28, 2004
Returned for revision May 10, 2004
Accepted May 10, 2004
Tobacco Mosaic Virus Regulates the Expression of Its Own Resistance Gene N
Michal Levy , Orit Edelbaum , and Ilan Sela *
The Hebrew University of Jerusalem, Faculty of Agricultural, Food and Environmental Quality Sciences, Robert H. Smith Institute for Plant Science and Genetics, Virus Laboratory, Rehovot 76100, Israel
* Corresponding author; email: sela{at}agri.huji.ac.il.
The N gene of tobacco (Nicotiana tabacum) is a typical resistance (R) gene engendering localization of tobacco mosaic virus (TMV) infection and the elicitation of a hypersensitive necrotic response. The consensus model for R gene-derived resistance is at the level of protein:protein interactions, in which proteins of the pathogen interact with already present receptor-like proteins produced by the plant's R genes. This article demonstrates, by quantitative real-time reverse transcription-PCR analysis, that in tobacco carrying the dominant allele N, a basal level of transcription indeed occurs in noninfected plants. However, accumulation of N-mRNA in infected plants indicates that transcription is stimulated by TMV infection (up to 38-fold in locally infected leaves and up to 165-fold in upper, noninoculated leaves). Potato virus Y infection did not result in accumulation of N-mRNA, indicating a specific TMV-related phenomenon. The possible uncoupling of viral restriction from necrosis is discussed.
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