Resistance to viruses in F1 hybrids produced by direct crossing between diploid Solanum series Tuberosa and diploid S. brevidens (series Etuberosa) using S. phureja for rescue pollination |
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| Authors: | J P T Valkonen M Orrillo S A Slack R L Plaisted K N Watanabe |
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| Institution: | Department of Plant Pathology, Cornell University, Ithaca, NY 14853, USA;Genetic Resources Department, International Potato Center, Apartado 1558, Lima, Peru;Department of Plant Breeding and Biometry, Cornell University, Ithaca, NY 14853, USA;Department of Plant Production, PO Box 27, Viikki, FIN-00014 University of Helsinki, Finland |
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| Abstract: | Resistance to potato viruses was examined in the F1 hybrids (TET) obtained from a cross between a diploid (2n = 24), tuber-bearing interspecific hybrid 87HW13.7 (Solanum tuberosum W231 ×S. multi-dissectum PI 473354) and a diploid (2n = 24), nontuber-bearing wild potato species (S. brevidens CPC 2451) using S. phureja IvP35 (2n = 24) for rescue pollination. The parental plants were susceptible to PVX, whereas two hybrids (TET38.2 and TET38.9) and S. phureja IvP35 reacted with hypersensitivity to PVX. Two hybrids (TET 38.9 and TET 38.12) were extremely resistant to PVY°, which was similar to S. brevidens and S. phureja IvP35, whereas the remaining two hybrids were moderately resistant to PVY°. No resistance to PVA and PLRV was observed in the progenies, in contrast to S. brevidens which 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 pollinator S. phureja IvP35, or (2) transgressive or complementary gene action. |
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| Keywords: | Solanum brevidens Solanum phureja (di) haploid rescue pollination somatic translocation virus resistance |
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