Lettuce mosaic virus: from pathogen diversity to host interactors.
Sylvie German-Retana1, Jocelyne Walter, Olivier Le Gall
1UMR1090 Génomique Diversité Pouvoir Pathogène, INRA Université de Bordeaux 2, F-33883 Villenave D'Ornon, France. german@bordeaux.inra.fr
Molecular Plant Pathology
|August 19, 2008
Summary
Lettuce mosaic virus (LMV) is a widespread plant pathogen affecting various crops. Genetic resistance in lettuce, mediated by eIF4E gene alleles, is crucial for controlling LMV spread and impact.
Area of Science:
- Plant Virology
- Molecular Plant Pathology
Background:
- Lettuce mosaic virus (LMV) is a filamentous Potyviridae family virus with a 10,080-nucleotide genomic RNA.
- The virion measures 750 nm in length and 15 nm in width, encapsidating RNA linked to a viral protein (VPg) and a 3' poly-A tail.
Purpose of the Study:
- To detail the taxonomy, physical properties, genome organization, hosts, transmission, and symptoms of Lettuce mosaic virus (LMV).
- To highlight the genetic basis of resistance in lettuce against LMV.
Main Methods:
- Characterization of LMV virion structure and genomic RNA.
- Identification of susceptible host species and LMV transmission vectors.
- Analysis of genetic resistance mechanisms in lettuce.
Main Results:
- LMV exhibits worldwide distribution, infecting numerous plant families, with Asteraceae species being particularly susceptible.
- Non-persistent transmission occurs via numerous aphid species, with seedborne transmission also noted in lettuce.
- Recessive resistance genes mo1(1) and mo1(2), mutant alleles of eIF4E, are key for LMV resistance in lettuce.
Conclusions:
- Understanding LMV's biological and genetic characteristics is vital for effective disease management in lettuce cultivation.
- Genetic resistance targeting the eIF4E gene provides a primary strategy for controlling LMV.
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