Phytoparasitica (1997) 25, p. 221 (Yang et al.)

S.J. Yang, F. Revers, J. Walter, O. Le Gall, H. Lot, S. Souche, J. Dunez and T. Candresse (1997)
Complete sequence of two Lettuce mosaic virus (LMV) isolates differing in their seed-transmissibility and in their resistance-breaking properties
Phytoparasitica 25 (3), 221-221
The Xth International Congress of Virology, August 11-16, 1996, Binyanei haOoma, Jerusalem, Israel, poster
Abstract: LMV is probably the most damaging virus on lettuce crops worldwide. Its ability to be efficiently seed-transmitted in this host is one of the key factors of its epidemiology, together with the efficient transmission by aphids typical of potyviruses. Currently, control of LMV is based on employing both virus-free seed lots and resistance varieties containing one of two recessive resistance genes, mol¹ or mol². As a preliminary step in determining the molecular bases of resistance breaking and seed transmissibility in lettuce, the complete sequence of the genomic RNAs of two LMV isolates, LMV-O and LMV-E, was determined from cDNA clones. LMV-O is a seed-transmissible isolate against which the resistance genes are effective, whereas LMV-E is able to overcome both mol¹ and mol² but is not seed-transmitted in susceptible cultivars. The data obtained indicate that these two isolates are remarkably close, being over 97% identical at the protein level.
Database assignments for author(s): Olivier le Gall

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

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Pest and/or beneficial records:

Beneficial	Pest/Disease/Weed	Crop/Product	Country	Quarant.
	Lettuce mosaic virus	Lettuce (Lactuca)