Data/hora: 10/06/2024 03:32:02

Provedor de dados: | Genetics and Molecular Biology
País: | Brazil
Título: | Phenotypic plasticity of Myzus persicae (Hemíptera: Aphididae) raised on Brassica oleracea L. var. acephala (kale) and Raphanus sativus L. (radish)
Autores: | Peppe,Fernanda Borja; Lomônaco,Cecília.
Data: | 2003-01-01
Ano: | 2003
Palavras-chave: | Quantitative genetics; Genetic correlation; Morphological plasticity; Phenotypic correlation; Physiological plasticity; Trade-offs.
Resumo: | The study of variability generated by phenotypic plasticity is crucial for predicting evolutionary patterns in insect-plant systems. Given sufficient variation for plasticity, host race formation can be favored and maintained, even simpatrically. The plasticity of size and performance (assessed by the lifetime fitness index r m) of six clones of Myzus persicae was tested, with replicates allowed to develop on two hosts, kale (Brassica oleracea var. acephala) and radish (Raphanus sativus). The clones showed significant variability in their plasticity. Reaction norms varied through generations and negative genetic correlation, although not significant, tend to increase with the duration of host use. The lack of plasticity in lifetime fitness among generalist clones occurred as an after-effect of the highly plastic determinants. Significant morphological plasticity in host used was observed, but no variation in the plastic responses (GxE interaction) was detected. Strong selection for a larger size occurred among individuals reared on radish, the most unfavorable host. Morphological plasticity in general body size (in a multivariate sense) was not linear related to fitness plasticity. These observations suggest that a high potential for the evolution of host divergence favors host race formation.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1415-47572003000200012
Editor: | Sociedade Brasileira de Genética
Relação: | 10.1590/S1415-47572003000200012
Formato: | text/html
Fonte: | Genetics and Molecular Biology  v.26 n.2 2003
Fonte: | info:eu-repo/semantics/openAccess