Relationship between epistasis and aggressiveness in resistance of pepper (Capsicum annuum L. ) to Phytophthora nicotianae
Genet. mol. biol
; 33(2): 279-284, 2010. graf, tab
Artigo
em Inglês
| LILACS
| ID: lil-548801
Biblioteca responsável:
BR1.1
ABSTRACT
This study evaluated the types of gene action governing the inheritance of resistance to Phytophthora nicotianae necrosis in populations derived from two crosses involving two susceptible (Beldi and Nabeul II) and one resistant (CM334) cultivars of pepper (Capsicum annuum L.). Populations, composed of Pr, Ps, F1,F2,BC1Pr, and BC1Ps generations, were inoculated with six P. nicotianae isolates. Generation means analysis indicated that an additive-dominance model was appropriate for P. nicotianae isolates PnKo1,PnKo2 and PnKr1, which showed low aggressiveness in the two crosses. For the more aggressive isolates PnBz1,PnBz2 and PnKr2, epistasis was an integral component of resistance in the two crosses. The presence of epistasis in the resistance of pepper to P. nicotianae was dependent on the level of aggressiveness of the isolates. Selection in pepper with less aggressive isolates was efficient, but not with more aggressive isolates; on the other hand, selection with more aggressive isolates was more stable. The minimum number of genes controlling resistance was estimated at up to 2.71. In the majority of cases, the additive variance was significant and greater than the environmental and dominance variance.
Texto completo:
Disponível
Coleções:
Bases de dados internacionais
Base de dados:
LILACS
Idioma:
Inglês
Revista:
Genet. mol. biol
Assunto da revista:
Genética
Ano de publicação:
2010
Tipo de documento:
Artigo
País de afiliação:
Austrália
/
Tunísia
Instituição/País de afiliação:
Department of Agriculture and Food/AU
/
Institut National de la Recherche Agronomique de Tunisie/TN
/
Université Tunis El Manar/TN