Evaluation and inheritance of the Lycopersicon hirsutum resistance against potato virus Y

Legnani, R.; Selassie, K. Gebre; Womdim, R. Nono; Gognalons, Patrick; Moretti, A.; Laterrot, H.; Marchoux, Georges

doi:10.1007/bf00016359

Cited by 28 publications

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“…In Lycopersicon hirsutum, a wild relative of tomato, the pot-1 gene confers resistance to PVY (Legnani et al 1995;Parrella et al 2002;Thomas 1981). The pot-1 resistance is not used in tomato breeding and existence of virulent isolates of PVY in natural conditions is unknown.…”

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Mutations in Potato virus Y Genome-Linked Protein Determine Virulence Toward Recessive Resistances in Capsicum annuum and Lycopersicon hirsutum

Moury¹,

Morel²,

Johansen³

et al. 2004

MPMI

180

171

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The recessive resistance genes pot-1 and pvr2 in Lycopersicon hirsutum and Capsicum annuum, respectively, control Potato virus Y (PVY) accumulation in the inoculated leaves. Infectious cDNA molecules from two PVY isolates differing in their virulence toward these resistances were obtained using two different strategies. Chimeras constructed with these cDNA clones showed that a single nucleotide change corresponding to an amino acid substitution (Arg119His) in the central part of the viral protein genome-linked (VPg) was involved in virulence toward the pot-1 resistance. On the other hand, 15 nucleotide changes corresponding to five putative amino acid differences in the same region of the VPg affected virulence toward the pvr2(1) and pvr2(2) resistances. Substitution models identified six and five codons within the central and C terminal parts of the VPg for PVY and for the related potyvirus Potato virus A, respectively, which undergo positive selection. This suggests that the role of the VPg-encoding region is determined by the protein and not by the viral RNA apart from its protein-encoding capacity.

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confidence: 99%