Data/hora: 13/06/2024 02:18:15

Provedor de dados: | Genetics and Molecular Biology
País: | Brazil
Título: | Combining ability of Phaseolus vulgaris L. for resistance to common bacterial blight
Autores: | Rodrigues,Rosana; Leal,Nilton Rocha; Pereira,Messias Gonzaga; Lam-Sánchez,Alfredo.
Data: | 1999-12-01
Ano: | 1999
Resumo: | Many diseases limit dry bean and snap bean yields. Common bacterial blight (CBB), caused by Xanthomonas axonopodis pv. phaseoli, is one of the most serious bacterial diseases in dry bean and snap bean that cause crop losses. Since there is no satisfactory chemical control, the use of resistant cultivars is an important control measure. Genetic studies of resistance are important for choosing appropriate breeding methods. Combining ability was determined for disease resistance in three snap bean genotypes (Alessa, Hab 52 and Hab 198) and two dry bean genotypes (Bac-6 and A-794). Plants were inoculated with highly pathogenic isolate CNF 15, using a razor blade procedure in leaves and needle punctures in pods. They were evaluated 7 days after inoculation. Leaves were evaluated on a 1 to 5 scale and pods by lesion diameter. Diallel analysis was conducted using Griffing's model. General combining ability (GCA) was significant for both leaf and pod infection, whereas specific combining ability (SCA) was significant for disease reaction in pods. Bac-6 and A-794 were considered superior genotypes for leaf resistance. Nonadditive effects were predominant in pod reactions, and Alessa x Bac-6, Alessa x A-794 and Hab 52 x Bac-6 were the best combinations.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47571999000400018
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47571999000400018
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.22 n.4 1999
Fonte: | info:eu-repo/semantics/openAccess