Potato clones with multiple copies of the Ryadg allele conferring resistance to PVY

Abstract

Potato (Solanum tuberosum L.) breeding for PVY resistance is of utmost importance, in view of the greatdamage this disease can cause. The establishment of triplex (RyRyRyry) or quadruplex (RyRyRyRy) clones as parents facilitatebreeding work because their progenies have a high proportion of clones with the resistant allele. The purpose of this study wasto select clones with three to four copies of the Ryadg allele from a population derived from duplex (RyRyryry) crosses and toevaluate the agricultural traits. Testcrosses with a nulliplex genotype (ryryryry) were performed to identify the genotypes forthe Ryadg allele, using the SCAR RYSC3 marker. Triplex and quadruplex clones were identified by the marker, but a largernumber of progenies of the test-cross must be tested for the confirmation of their genotypes. The agricultural performance ofthe clones with the Ryadg allele was better than of the control cultivars.

Keywords

• Solanum tuberosum L.
• virus
• resistance
• PVY.