Data/hora: 10/06/2024 19:15:10

Provedor de dados: | 86
País: | Brazil
Título: | Diallel analysis for frogeye leaf spot resistance in soybean
Autores: | Gravina,Geraldo de Amaral; Sediyama,Carlos Sigueyuki; Martins Filho,Sebastião; Moreira,Maurílio Alves; Barros,Everaldo Gonçalves de.
Data: | 2003-06-01
Ano: | 2003
Palavras-chave: | Glycine max; Cercospora sojina; Combining ability; Heterosis; Genetic resistance; Genetic parameters.
Resumo: | Seven soybean cultivars (Bossier, Cristalina, Davis, Kent, Lincoln, Paraná and Uberaba), with different levels of resistance to Cercospora sojina, were crossed in a diallel design to determine the general (GCA) and specific (SCA) combining abilities relative to the inheritance of the resistance. Race 04 of the fungus was inoculated in the parents and in the 21 F1 hybrids in a greenhouse in a completely randomized design, with 12 replications. The reactions to the disease were evaluated 20 days after the inoculation, always on the most infected leaflet. Both GCA and SCA were significant for all the evaluated characters, being inferred that, for the expression of the characters, the additive, dominant and, possibly, epistatic genic actions were important. The largest values of estimated SCA effect (&lt;IMG SRC="/img/revistas/pab/v38n6/18215x01.gif"&gt;ij) were observed in the hybrid combinations where at least one parent presented high GCA. Cristalina, Davis and Uberaba cultivars showed the largest estimates for GCA effect (&lt;IMG SRC="/img/revistas/pab/v38n6/18215x02.gif"&gt;i), and from the analysis of &lt;IMG SRC="/img/revistas/pab/v38n6/18215x03.gif"&gt;ii, the contribution of these parents to heterosis of their hybrids will be towards the reduction of the disease symptoms. Therefore, these cultivars are indicated as parents in breeding programs that seek the development of soybean cultivars with resistance to frogeye leaf spot.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2003000600002

Editor:

Embrapa Secretaria de Pesquisa e Desenvolvimento

Pesquisa Agropecuária Brasileira

Relação: | 10.1590/S0100-204X2003000600002
Formato: | text/html
Fonte: | Pesquisa Agropecuária Brasileira  v.38 n.6 2003
Fonte: | info:eu-repo/semantics/openAccess