There have been several comprehensive English language historical reviews of strawberry genetics and improvement, notably those of Darrow (1937Darrow ( , 1966 and Scott and Lawrence (1975). Gaining an understanding of strawberry genetics is complicated by varying species ploidy levels, hybrid origin of several of the polyploid species, and a combination of discontinuous (discrete or Mendelian) and continuous (quantitative or multifactorial) inheritance patterns for various traits within the same plant.Genetic exchange within and among species in the genus Fragaria is further limited by sexual dimorphism in some of the species, and by partial or complete cross-incompatibility in both heteroploid and in some homoploid hybridizations. Fortunately, exchange among the octoploid species, including the garden or cultivated strawberry and its ancestral American parent species, is relatively unrestricted.An attempt will be made in this review to outline major trends in strawberry genetics research since the Scott and Lawrence paper, or roughly the period from 1970 to 1989. Cytogenetic, evolutionary, and ecological facets of the strawberry genetics picture will be treated lightly, or not at all, because these topics will be treated by others in this series.
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