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Horticultura Brasileira

versão impressa ISSN 0102-0536

Resumo

SILVA, Giovani O da et al. Estimation of the combining ability in early generations of potato selection. Hortic. Bras. [online]. 2009, vol.27, n.3, pp.275-279. ISSN 0102-0536.  https://doi.org/10.1590/S0102-05362009000300002.

The combining ability of potato genotypes was estimated in early generations of selection. The experiments were carried out at Embrapa Clima Temperado, in Pelotas, Brazil. Twenty potato families derived from nine genotypes crossed in a 4 x 5 partial mating design (C-1750-15-95, 2CRI-1149-1-78, C-1786-6-96 and 'Eliza'; 'White Lady', 'Asterix', 'BP-1', 'Vivaldi' and 'Ágria') were evaluated. The families were evaluated in seedling and first field generation, in a randomized complete block design, with three replications of 15 genotypes. Each plot consisted of a sample of 15 genotypes of a family. In the two generations, yield, number and average tuber weight were evaluated. The data were submitted to analysis of variance and to partial diallel analysis. For yield, the gene additive effects predominated, while for tuber number and average tuber mass, both additive and non additive effects were equally important. 2CRI-1149-1-78 and 'White Lady' showed to be the most promising parents for the three traits, while 'Ágria' revealed superiority for mean tuber weight. The two generations presented similar estimative of general combining ability.

Palavras-chave : Solanum tuberosum L.; factorial mating design; early generations; partial diallel.

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