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Extreme Resistance is Epistatic to Hypersensitive Resistance to Potato Virus Y-O in a Solanum tuberosum subsp. andigena Derived Potato Genotype



Extreme Resistance is Epistatic to Hypersensitive Resistance to Potato Virus Y-O in a Solanum tuberosum subsp. andigena Derived Potato Genotype



Plant Disease 78(12): 1177-1180



Resistance to potato virus Y (PVY) was examined in diploid potato progeny from a cross of two diploid, interspecific hybrids, 2X(V-2)7 (extremely resistant to PVY) and 84.194-30 (susceptible to PVY-O). The pedigree of 2X(V-2)7 includes Solanum tuberosum subsp. andigena (extremely resistant to PVY-O) and S. t. tuberosum (susceptible to PVY-O). Following inoculation, 34 F-1 progeny (Ry/ry Ny/ny or Ry/ry ny/ny) and 2X(V-2)7 (Ry/ry Ny/ny) remained symptomless and no virus was detected by ELISA, which is characteristic of extreme resistance controlled by the Ry-adg gene. Eight progeny (ry/ry Ny/ny) developed leaf-drop, necrotic streaks, lesions, and mottle symptoms in systemically infected leaves, which are characteristic of hypersensitive resistance controlled by an Ny gene. Twenty progeny (ry/ry ny/ny) and 84.194.30 (ry/ry ny/ny) were susceptible to PVY-O and developed mottle symptoms without necrosis. These results indicated that extreme resistance and hypersensitivity to PVY-O were derived from S. t. andigena and that the expression of extreme resistance is epistatic to the expression of hypersensitivity in 2X(V-2)7.

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