A fitness cost for Turnip mosaic virus to overcome host resistance

文献类型: 外文期刊

第一作者: Jenner, CE

作者: Jenner, CE;Wang, XW;Ponz, F;Walsh, JA

作者机构:

关键词: TuMV;fitness;potyvirus;Brassica;competition;avirulence

期刊名称:VIRUS RESEARCH ( 影响因子:3.303; 五年影响因子:3.445 )

ISSN: 0168-1702

年卷期: 2002 年 86 卷 1-2 期

页码:

收录情况: SCI

摘要: The relative fitness of the Turnip mosaic virus (TuMV) isolate UK 1 was compared with that of two other wildtype isolates CZE 1 and CDN 1. The isolates CZE 1 and CDN 1 are able to overcome the effect of the resistance gene TuRB01 and at least three other resistance sources that are effective against UK 1. Comparisons were also made between the fitness of UK I and a recombinant virus with a single nucleotide change (v35Tunos + 5570 A > G) conferring the ability to overcome TuRB01 resistance. Co-inoculation experiments were carried out where pairs of isolates were serially passaged over 5 months in a plant line possessing no known resistance genes in order to examine the relative fitness of the isolates. In each case, UK 1 dominated the mixture in the susceptible host background. It out-competed CZE 1 and v35Tunos + 5570 A > G within four passages, and CDN 1 after one passage. The greater fitness of UK 1 suggests that there may be a fitness cost to TuMV overcoming resistance genes of brassica crops, This may shed some light on the frequency of naturally occurring isolates, in that pathotype 1 isolates are found much more frequently than isolates of other pathotypes. Implications for the deployment of TuRB01 are discussed. (C) 2002 Elsevier Science B.V. All rights reserved.

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