Phytopathology (2002) 92, 563-572

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Renate Krause-Sakate, Olivier Le Gall, Hatem Fakhfakh, Martine Peypelut, Mohammed Marrakchi, Christina Varveri, Marcelo A. Pavan, Sylvie Souche, Hervé Lot, F. Murilo Zerbini and Thierry Candresse (2002)
Molecular and biological characterization of Lettuce mosaic virus (LMV) isolates reveals a distinct and widespread type of resistance-breaking isolate: LMV-Most
Phytopathology 92 (5), 563-572
Abstract: Lettuce mosaic virus (LMV) causes an economically important seedborne and aphid-transmitted disease of lettuce and ornamental crops worldwide. The genetic diversity among 73 LMV isolates was examined based on a 216-nucleotide sequence at the variable region encoding the NIb-coat protein junction. Three clusters of LMV isolates were distinguished: LMV-Yar, LMV-Greek, and LMV-RoW. In the latter cluster, two subgroups of isolates, LMV-Common and LMV-Most, accounted for a large proportion of the LMV isolates analyzed. These two subgroups included the seedborne isolates, consistent with this property contributing a selective advantage and resulting in widespread distribution. In addition to being seedborne, LMV-Most isolates overcome the two resistance genes commonly used in lettuce, mo11 and mo12, and thus represent a potential threat to lettuce cultivation. The complete sequence of an LMV-Most isolate (LMV-AF199) was determined, allowing a better definition of the genetic relationships among LMV-Most, LMV-Common, and an additional isolate of the LMV-RoW cluster.
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Database assignments for author(s): Renate Krause-Sakate, F. Murilo Zerbini, Christina Varveri

Research topic(s) for pests/diseases/weeds:
molecular biology - genes
resistance/tolerance/defence of host

Pest and/or beneficial records:

Beneficial Pest/Disease/Weed Crop/Product Country Quarant.

Lettuce mosaic virus