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    Reconstructing Fragaria x ananassa utilizing wild F-virginiana and F-chiloensis
    (Springer, 2008) Luby, James J.; Hancock, James F.; Dale, Adam; Serce, Sedat
    The genetics of disease resistance, winter hardiness, spring bloom date, fruit set, ovule set, fruit size, and photoperiod sensitivity was investigated in crosses between sets of elite selections of F. virginiana and F. chiloensis in Minnesota and Ontario. In Minnesota, family means varied considerably for all traits except ovule set. For all other traits, general combining ability was significant for at least one species, while specific combining ability was significant for only spring bloom date. In Ontario, general combining ability was significant for all traits in at least one species except flower number. Just as they were in previous crosses with F. x ananassa cultivars, the F. virginiana parents High Falls 22 and Montreal River 10 were notable for producing offspring with large fruit and high fertility. Fragaria chiloensis parents exhibited strong combining ability effects for short day-induced flowering and suppressed the expression of day-neutral flowering in these progeny compared to progeny of these F. virginiana in previous crosses with F. x ananassa. These results indicate that substantial breeding progress can be made by reconstructing F. x ananassa if care is taken to select elite, complementary genotypes of F. virginiana and F. chiloensis.
  • Küçük Resim
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    Reconstruction of the Strawberry, Fragaria xananassa, Using Genotypes of F. virginiana and F. chiloensis
    (Amer Soc Horticultural Science, 2010) Hancock, James F.; Finn, Chad E.; Luby, James J.; Dale, Adam; Callow, Pete W.; Serce, Sedat
    The germplasm base of strawberries is restricted. The major cultivated strawberry species, Fragaria xananassa, originated approximate to 250 years ago when South American F. chiloensis subsp. chiloensis forma chiloensis and North American F. virginiana subsp. virginiana accidentally hybridized in European gardens. Since that time, only a handful of native clones have been used by breeders. As a novel way to expand the germplasm base of the strawberry, we preselected native clones of F. virginiana and F. chiloensis for a wide range of horticulturally important characteristics and then reconstructed F. xananassa by crossing superior clones of each. Before crossing between species, we undertook one round of selection within species to maximize diversity. Reconstruction appeared to be an effective method of strawberry improvement, because superior families and individuals were identified that had outstanding vigor, high productivity, seed set, fruit color, and firmness. None of the fruit were of commercial size, but one reconstruction family, FVC 11 [(F. virginiana Frederick 9 x LH 50-4) x (F. chiloensis Scotts Creek x 2 MAR 1A)], had individuals with fruit weights of almost 20 g.
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    Öğe
    Reconstruction of the strawberry, fragaria ×ananassa, using genotypes of F. virginiana and F. chiloensis
    (American Society for Horticultural Science, 2010) Hancock, James F.; Finn, Chad E.; Luby, James J.; Dale, Adam; Callow, Pete W.; Serçe, Sedat
    The germplasm base of strawberries is restricted. The major cultivated strawberry species, Fragaria ×ananassa, originated ?250 years ago when South American F. chiloensis subsp. chiloensis forma chiloensis and North American F. virginiana subsp. virginiana accidentally hybridized in European gardens. Since that time, only a handful of native clones have been used by breeders. As a novel way to expand the germplasm base of the strawberry, we preselected native clones of F. virginiana and F. chiloensis for a wide range of horticulturally important characteristics and then reconstructed F. ×ananassa by crossing superior clones of each. Before crossing between species, we undertook one round of selection within species to maximize diversity. Reconstruction appeared to be an effective method of strawberry improvement, because superior families and individuals were identified that had outstanding vigor, high productivity, seed set, fruit color, and firmness. None of the fruit were of commercial size, but one reconstruction family, FVC 11 [(F. virginiana Frederick 9 × LH 50-4) × (F. chiloensis Scotts Creek × 2 MAR 1A)], had individuals with fruit weights of almost 20 g.