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Combining ability for important horticultural traits in medium- and late-maturing strawberry cultivars

2008; De Gruyter; Volume: 16; Linguagem: Inglês

2300-8849

A. Masny, Wiesław Mądry, E. Żurawicz,

Horticultural and Viticultural Research

The study concerned the progeny of ten medium- and late-maturing strawberry cultivars ('Pandora', 'Vicoda', 'Vikat', 'Pegasus', 'Elkat', 'Marmolada', 'Filon', 'Segal', 'Sophie' and 'Camarosa'), which were crossed in 1999 in a complete diallel design in accordance with Griffing's fourth method. In 2001-2002, 2700 plants of the diallel progeny were individually assessed in terms of the following traits: plant growth habit, growth vigour, fruit ripening time, marketable yield, fruit weight and fruit susceptibility to grey mould, as well as plant susceptibility to white leaf spot, leaf scorch and powdery mildew. The obtained results were evaluated statistically by means of an analysis of variance in accordance with the Griffing's fixed-effect model and Bonferroni's t-test. It was found that the general and specific combining ability effects (GCA and SCA) differed significantly for most of the traits, which means that the both types of effects are very important in the genetic determination of those traits in progeny. On the basis of the estimates of the GCA effects it was found that among the parental cultivars under assessment the highest usefulness for breeding late cultivars was shown by 'Pandora', 'Vicoda', 'Vikat' and 'Sophie'. However, 'Pandora' and 'Vikat' can also contribute to a reduction in fruit size in progeny. 'Pandora' passed on to its progeny low susceptibility of fruit to grey mould, but also high susceptibility to the two leaf diseases, i.e. white leaf spot and leaf scorch. The cultivars 'Segal' and 'Camarosa' show high usefulness for breeding large-fruited cultivars of relatively early maturity. Moreover, the cultivar 'Segal' is a donor of low susceptibility to powdery mildew. Significantly positive SCA effects for marketable fruit yield were found in two families ('Pandora' x 'Filon' and 'Vikat' x 'Marmolada'), for fruit size in eight families ('Pandora' x 'Vikat', 'Pandora' x 'Elkat', 'Pandora' x 'Marmolada', 'Vicoda' x 'Segal', 'Vicoda' x 'Camarosa', 'Marmolada' x 'Camarosa', 'Segal' x 'Camarosa' and 'Sophie' x 'Camarosa'), and for late fruit ripening also in eight families ('Pandora' x 'Filon', 'Pandora' x 'Sophie', 'Vicoda' x 'Pegasus', 'Vicoda' x 'Marmolada', 'Vicoda' x 'Sophie', 'Vikat' x 'Elkat', 'Marmolada' x 'Segal' and 'Filon' x 'Camarosa').