PMID: 8580963Dec 1, 1995Paper

The coat protein of potato virus X is a strain-specific elicitor of Rx1-mediated virus resistance in potato

The Plant Journal : for Cell and Molecular Biology
Abdelhafid BendahmaneDavid C Baulcombe

Abstract

The Rx1 gene in potato confers extreme resistance to potato virus X (PVX). To investigate the mechanism and elicitation of Rx resistance, protoplasts of potato cv. Cara (Rx1 genotype) and Maris Bard (rx1 genotype) were inoculated with PVX and tobacco mosaic virus (TMV). At 24 h post-inoculation in Maris Bard protoplasts there was at least 100-fold more PVX RNA than in protoplasts of Cara. TMV RNA accumulated to the same level in both types of protoplast. However, when the TMV was inoculated together with PVX the accumulation of TMV RNA was suppressed in the Cara (Rx1 genotype) protoplasts to the same extent as PVX. The Rx1 resistance also suppressed accumulation of a recombinant TMV in which the coat protein gene was replaced with the coat protein gene of PVX. It is therefore concluded that Rx1-mediated resistance is elicited by the PVX coat protein, independently of any other proteins encoded by PVX. The domain of the coat protein with elicitor activity was localized by deletion and mutation analysis to the structural core of a nonvirion form of the coat protein.

Citations

May 18, 2000·Plant Science : an International Journal of Experimental Plant Biology·L ValatM Burrus
Sep 6, 2000·Trends in Plant Science·J EllisT Pryor
Sep 6, 2000·The Plant Journal : for Cell and Molecular Biology·E A van der VossenR M Klein-Lankhorst
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Oct 18, 2002·The Plant Journal : for Cell and Molecular Biology·Abdelhafid BendahmaneDavid C Baulcombe
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Oct 6, 2006·Proceedings of the National Academy of Sciences of the United States of America·Garry Farnham, David C Baulcombe
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