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Provedor de dados:  Agronomy
País:  Brazil
Título:  Combining ability for common bacterial blight resistance in snap and dry bean (Phaseolus vulgaris L.)
Autores:  Trindade, Roberto dos Santos
Rodrigues, Rosana
Amaral Junior, Antonio Teixeira do
Gonçalves, Leandro Simões Azeredo
Viana, José Marcelo Soriano
Sudré, Claudia Pombo
Data:  2014-11-25
Ano:  2014
Palavras-chave:  Xanthomonas axonopodis pv. phaseoli
Disease-resistance inheritance
Genetic effects
General and specific combining ability
Resumo:  Common bacterial blight (CBB), which is caused by Xanthomonas axonopodis pv. phaseoli (Xap), is the main bacterial disease in snap beans and controlling this disease using resistant cultivars is still a challenge. This work aimed to study the combining ability for CBB resistance in Phaseolus vulgaris genotypes. Six parents (two genotypes of CBB-resistant dry bean and four susceptible snap bean accessions) were crossed in a complete diallel scheme without reciprocals to estimate the general and specific ability to Xap resistance. CBB resistance was evaluated by the inoculation with two Xap isolates, and its severity was evaluated based on the four following resistance components: area under the disease progress curve; scores in the leaves; latent period and diameter of pod lesion. Differences between the two isolates were observed considering all the disease components. Besides pathogen variability, significant GCA and SCA indicate that additive and non-additive effects are involved in Xap-resistance control for the evaluated genotypes, implying that CBC resistance is a trait with complex inheritance. For breeding purposes, the result demonstrates the need to apply breeding methods that are focused on advanced generations selection.  
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês

Editor:  Universidade Estadual de Maringá
Formato:  application/pdf
Fonte:  Acta Scientiarum. Agronomy; v. 37, n. 1 (2015); 37-43

Acta Scientiarum. Agronomy; v. 37, n. 1 (2015); 37-43



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