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Provedor de dados:  Genet. Mol. Biol.
País:  Brazil
Título:  Relationship between leaf stages and epistasis for resistance to Stagonospora nodorum in durum wheat
Autores:  Bnejdi,Fethi
El Gazzah,Mohamed
Data:  2012-01-01
Ano:  2012
Palavras-chave:  Adaptability
Leaf stage
Stagonospora nodorum blotch
Resumo:  Ten varieties and eight generations (2F1, 2F2, 2B1 and 2B2) of durum wheat derived from two crosses were evaluated for resistance to natural infection by Stagonospora nodorum blotch (SNB) at the 2-3 and 6-7 leaf stages at two sites over two years. There were significant differences in the incidence of SNB between leaf stages in most of the wheat varieties, with resistance being most evident at the 6-7 leaf stage. Separate analyses of the mean values for each generation showed that the genetic mechanism of defense against the pathogen depended upon the leaf stage. At the 2-3 leaf stage, only additive and dominance effects were implicated in the control of SNB for the two crosses at the two sites and for the two replications. For the 6-7 leaf stage, inheritance was more complicated and an epistatic effect was involved. Narrow-sense heritability values (range: 0.63-0.67) were consistent between crosses and leaf stages. These findings indicate a lack of resistance to SNB at the 2-3 leaf stage whereas resistance was observed at the 6-7 leaf stage and involved the genetic mechanisms of plant defense such as epistasis.
Tipo:  Info:eu-repo/semantics/article
Idioma:  Inglês
Editor:  Sociedade Brasileira de Genética
Relação:  10.1590/S1415-47572012005000033
Formato:  text/html
Fonte:  Genetics and Molecular Biology v.35 n.2 2012
Direitos:  info:eu-repo/semantics/openAccess

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