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Título: Combining ability of summer-squash lines with different degrees of parthenocarpy and PRSV-W resistance
Autor(es): Nogueira, Douglas Willian
Maluf, Wilson Roberto
Figueira, Antonia dos Reis
Maciel, Gabriel Mascarenhas
Gomes, Luiz Antonio Augusto
Benavente, Cesar Augusto Ticona
Assunto: Cucurbita pepo
PRSV-W - Resistance
Papaya ringspot virus
Publicador: Sociedade Brasileira de Genética
Data de publicação: 2011
Referência: NOGUEIRA, D. W. et al. Combining ability of summer-squash lines with different degrees of parthenocarpy and PRSV-W resistance. Genetics and Molecular Biology, Ribeirão Preto, v. 34, n. 4, p. 616-623, 2011.
Abstract: The aim was to assess heterosis in a set of 16 summer-squash hybrids, and evaluate the combining capacity of the respective parental lines, which differed as to the degree of parthenocarpy and resistance to PRSV-W (Papaya Ringspot Virus-Watermelon strain). The hybrids were obtained using a partial diallel cross design (4 × 4). The lines of parental group I were 1 = ABX-037G-77-03-05-01-01-bulk, 2 = ABX-037G-77-03-05-03-10-bulk, 3 = ABX-037G-77-03-05-01-04-bulk and 4 = ABX-037G-77-03-05-05-01-bulk, and of group II, 1′ = ABX-037G-77-03-05-04-08-bulk, 2′ = ABX-037G-77-03-05-02-11-bulk, 3′ = Clarice and 4′ = Caserta. The 16 hybrids and eight parental lines were evaluated for PRSV-W resistance, parthenocarpic expression and yield in randomized complete-block designs, with three replications. Parthenocarpy and the resistance to PRSV-W were rated by means of a scale from 1 to 5, where 1 = non-parthenocarpic or high resistance to PRSV-W, and 5 = parthenocarpic or high susceptibility to PRSV-W. Both additive and non-additive gene effects were important in the expression of parthenocarpy and resistance to PRSV-W. Whereas estimates of heterosis in parthenocarpy usually tended towards a higher degree, resistance to PRSV-W was towards higher susceptibility. At least one F1 hybrid was identified with a satisfactory degree of parthenocarpy, resistance to PRSV-W and high fruit-yield.
URI: http://repositorio.ufla.br/jspui/handle/1/12500
Idioma: en_US
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