Resistance to potato viruses was examined in the F1hybrids (TET) obtained from a cross between a diploid (2n = 24), tuber‐bearing interspecific hybrid 87HW13.7 (Solanum tuberosumW231 ×S. multi‐dissectumPI 473354) and a diploid (2n = 24), nontuber‐bearing wild potato species (S. brevidensCPC 2451) usingS. phurejaIvP35 (2n = 24) for rescue pollination. The parental plants were susceptible to PVX, whereas two hybrids (TET38.2 and TET38.9) andS. phurejaIvP35 reacted with hypersensitivity to PVX. Two hybrids (TET 38.9 and TET 38.12) were extremely resistant to PVY°, which was similar toS. brevidensandS. phurejaIvP35, whereas the remaining two hybrids were moderately resistant to PVY°. No resistance to PVA and PLRV was observed in the progenies, in contrast toS. brevidenswhich was extremely resistant to PVA and PLRV. Hypersensitivity to PVX in two progenies suggested (1) integration by somatic translocation or heterofertilization and expression of genes from the rescue pollinatorS. phurejaIvP35, or (2) transgressive or complementary gene action.
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Valkonen et al. (1995) studied this question.
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