Abstract
The crosses Fragaria moschata × F. nubicola, F. moschata × F. viridis, and their reciprocal combinations were done to create tetraploids for eventual introgression into octoploid cultivars of Fragaria × ananassa via the synthetic octoploid system. The combination F. nubicola × F. moschata averaged 3.3 healthy plants/pollination, which was 2.3 times higher than the next best combination, F. moschata × F. viridis. Fragaria viridis × F. moschata crosses averaged only 0.1 healthy plants/pollination and no plants were obtained from F. moschata × F. nubicola hybridizations. The success of the F. nubicola × F. moschata crosses in this study indicated that embryo/endosperm ratios were not as important a factor in producing hybrids with F. moschata × diploids species, as previously suggested.
Although 90% of pollinated flowers set fruit with an average of 19 seeds/pollination only 15% of the seeds contained healthy, white embryos and only 38% of these developed into healthy seedlings. The remaining 62% of embryos lacked pigment, had short hypocotyls or arrested development after slight expansion out of the seed coat. Only 39% of the crosses resulted in viable progenies. After one year, 27% of these hybrids bloomed and 71% of the blooming hybrids were tetraploids. All six diploid and six of the seven hexaploid accessions were successfully incorporated into 89 hybrids.
This is a preview of subscription content, log in via an institution to check access.
Similar content being viewed by others
References
Bhanthumnavin, K., 1965. A cytological study of polyploidy in the genus Fragaria. Ph.D. Thesis, University of Reading, England.
Bors, R., 2000. A streamlined synthetic octoploid system that emphasizes F. vesca as a bridge species. Ph.D. Thesis, University of Guelph, p. 272.
Bors, R. & J.A. Sullivan, 2005. Interspecific hybridization of Fragaria vesca subspecies with F. nilgerrensis, F. nubicola, F. pentaphylla and F. viridis. Accepted J Amer Soc Hort Sci.
Bumagima, S.I. & E. Mesaros, 1969. Evaluation of the results of hybridization of the strawberry species Fragaria vesca L., F. viridis Duch. and F. moschata Duch. by the set of hybrid seed and their viability. Genetika, Moskva 5(5): 32–38.
Evans, W.D., 1964. Cytogenetic investigations in the genus Fragaria. Ph.D. thesis, University of Reading, England.
Evans, W.D., 1974. Evidence of a crossability barrier in diploid × hexaploid and diploid × octoploid crosses in the genus Fragaria. Euphytica 23: 95–100.
Evans, W.D., 1977. The use of synthetic octoploids in strawberry breeding. Euphytica 26: 497–503.
Evans, W.D., 1982a. Guelph SO1 synthetic octoploid breeding clone. HortScience 17(5): 833.
Evans, W.D., 1982c. The production of multispecific octoploids from Fragaria species and the cultivated strawberry. Euphytica 31: 901–907.
Fadeeva, T.S., 1966. Problems of comparative plant genetics: Communication 1. Principles of genome analysis (with reference to the genus Fragaria). Genetika 2: 6–16.
Federova, N.J., 1946. Crossability and phylogenetic relations in the main European species of Fragaria. Compt Rend (Doklady) Acad Sci U.S.S.R. 52: 545–547.
Galletta, G.J. & J.L. Maas, 1990. Strawberry genetics. HortScience 25(8): 871–879.
Hermsen, J.G.Th., 1992. Introductory considerations on distant hybridization. In: G. Kalloo & J.B. Chowdhury (Eds.), Distant hybridization of crop plants, pp. 1–14. Springer-Verlag, New York.
Jones, J.K., 1976. Strawberry, Fragaria × ananassa (Rosaceae). In N.W. Simmonds (Ed.), Evolution of crop plants, pp. 237–242. Longman Group Ltd., London; UK.
Kantor, T.S., 1984. Results of breeding and genetic work aimed at creating economically valuable cultivars from incongruent crossing of Fragaria × ananassa Duch. × Fragaria moschata Duch Genetika 19(12): 1621–1635.
Maas, J.L., M.R. Pooler & G.J. Galletta, 1995. Bacterial angular leafspot disease strawberry: Present status and prospects for control. Adv Strawberry Res 14: 18–24.
Miller, A.R., J.C. Scheerens & P.S. Erb, 1992. Enhanced strawberry seed germination in vitro culture of cut achenes. J Amer Soc Hort Sci 117: 313–316.
Potter, D., J.J. Luby & R.E. Harrison, 2000. Phylogenetic relationships among species of Fragaria (Rosaceae) inferred from non-coding nuclear and chloroplast DNA sequences. Syst Bot 25: 337–348.
Reed, C.F., 1966. The strawberry species. In: G.M. Darrow (Ed.), The Strawberry, pp. 108–129. Holt, Rinehart, and Winston, New York.
Sangiacomo, M.A. & J.A. Sullivan, 1994. Introgression of wild species into the cultivated strawberry using synthetic octoploids. Theor Appl Genet 88: 349–354.
Sebastiampillia, A.R. & J.K. Jones, 1976. Improved techniques for the induction and isolation of polyploids in the genus Fragaria. Euphytica 25: 725–732.
Staudt, G., 1959. Cytotaxonomy and phylogenetic relationships in the genus Fragaria. Proceedings of the Ninth International Botanical Congress. Vol 2: 377.
Staudt, G., 1984. The cytological evidence of double restitution in Fragaria. Pl Syst Evol 146: 171–179.
Staudt, G., 1989. The species of Fragaria, their taxonomy and geographical location. Acta Hort 265: 23–33.
Trajkovski, K., 1993. Progress report on Fragaria species hybridization at Balsgard, Sweden. Acta Hort 348: 131–136.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Bors, R.H., Sullivan, J.A. Interspecific hybridization of Fragaria moschata with two diploid species, F. nubicola and F. viridis. Euphytica 143, 201–207 (2005). https://doi.org/10.1007/s10681-005-3496-9
Received:
Accepted:
Issue Date:
DOI: https://doi.org/10.1007/s10681-005-3496-9