Abstract
PVY causes yield and quality loss in potato. The Ryadg gene from Solanum tuberosum ssp. andigena has been shown to provide extreme resistance to PVY; defined as resistance against all strains. However, Ryadg gene clones have not been screened against PVYN:O, a newly detected North America strain. Three Ryadg-diagnostic molecular markers were tested in tetraploid progeny of a PVY resistant x susceptible cross and in diverse clones/cultivars. Multiple isolates of PVY strains (PVYNTN, PVYN:O, PVYO) were used for mechanical inoculations of the progeny. In addition, PVYO, PVYN, and PVA were used for graft inoculation on a separate clone/cultivar set. Progeny segregated 1:1 for PVY resistance; fitting a gene model simplex for Ryadg. Marker positive progeny were resistant to all PVY strains, including PVYN:O. Marker presence was also in agreement with PVY resistance in the clones/cultivars. These findings show that these markers can identify resistance to all known PVY strains in North America.
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