Day-neutral strawberry cultivars of Fragaria ×ananassa Duch. ex Rozier now play a dominant role in the Mediterranean climate of California, but day-neutrals have had little commercial success in the continental climates of the eastern United States and Canada. It has been over 30 years since a new day-neutral cultivar has been released outside of California, although a number of breeding programs have sought new day-neutral (DN) types (Dale et al., 2000; Galletta et al., 1981). Several factors have limited the development of day-neutral cultivars for the east, including: 1) uncertainty about the genetics of the day-neutral trait; 2) genotype × environment interactions related to temperature; and 3) a narrow germplasm base. In this article, we discuss these limitations and suggest a potential shift in breeding focus.
Bringhurst, R.S. & Voth, V. 1978 Origin and evolutionary potentiality of the day-neutral trait in octoploid Fragaria Genetics 90 510 (abstr.).
Darrow, G. 1966 Interaction of temperature and photoperiodism in the production fruit buds and runners in strawberries Proc. Amer. Hort. Soc. 34 360 363
Durner, E.F., Barden, J.E., Himelrick, D.G. & Poling, E.B. 1984 Photoperiod and temperature effects on flower and runner development in day-neutral, junebearing and everbearing strawberries J. Amer. Soc. Hort. Sci. 109 396 400
Hancock, J.F., Luby, J.J., Dale, A., Callow, P.W., Serçe, S. & El-Shiek, A. 2001 Utilizing wild Fragaria virginiana in strawberry cultivar development: Inheritance of photoperiod sensitivity, fruit size, gender, female fertility and disease resistance Euphytica 126 177 184
Shaw, D.V. & Famula, T.R. 2005 Complex segregation analysis of day-neutrality in domestic strawberry (Fragaria ×ananassa Duch.) Euphytica 145 331 338
Sugimoto, T., Tamaki, K., Matsumoto, Y., Shiwaku, K. & Watanabe, K. 2005 Detection of RAPD markers linked to the everbearing gene in Japanese cultivated strawberry Plant Breed 124 498 501
Weebadde, C.K., Wang, D., Finn, C.E., Lewers, K.S., Luby, J.J., Bushakra, J., Sjulin, T.M. & Hancock, J.F. 2008 Using a linkage mapping approach to identify QTL for day-neutrality in the octoploid strawberry (Fragaria ×ananassa Duch ex Rozier) Plant Breed 127 94 101