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Análise da correlação genotípica rendimento - qualidade em variedades de videira
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Autores
Orientador(es)
Resumo(s)
The ancient Portuguese viticulture led to the accumulation of a large amount of genetic variability
within native grapevine varieties. This variability is a high raw material for selection. When performing
genetic selection concerning several traits, it is very important to know the genetic correlation between
them.
Our main purpose was to study whether there are any phenotypic and genotypic correlations between
yield and quality traits. The study was conducted in six Portuguese grapevine varieties, in different
site/year combinations. Two different approaches were used. Firstly an univariate mixed model was
fitted to the data of different traits. When significant genetic variability was detected, the phenotypic
correlations between pairs of traits were evaluated. Secondly, two multivariate mixed models were
fitted. One considering independence between traits (model MM1) and the other considering
dependence between traits (modelo MM2). The efficiency of model MM2 over model MM1 was
calcuted using the predicted standard errors of the empirical best linear unbiased predictors of
genotypic values of the traits.
For the six varieties, the genotypic correlations between traits obtained with model MM2 were always
higher than the phenotypic correlations. Model MM2 had always a better fit than model MM1, leading
to a more precise and efficient selection.
Descrição
Mestrado em Biologia Funcional - Instituto Superior de Agronomia
Palavras-chave
grapevine genetic selection mixed models genotypic correlation
Contexto Educativo
Citação
Almeida, R.P. - Análise da correlação genotípica rendimento - qualidade em variedades de videira. Lisboa: ISA, 2013