Relação entre a variação genética de caracteres quantitativos e marcadores moleculares em subpopulações de cagaiteira (Eugenia dysenterica DC)
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2011-03
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Resumo
This research aimed to measure the association between molecular diversity and the genetic
variation of quantitative traits, estimated from a progeny trial, under controlled conditions. Ten natural
subpopulations of cagaita tree from the southeast of Goiás State, Brazil, were investigated. The maternal
families were evaluated in a trail using the randomized complete block design with four replications and
a single tree per plot. Quantitative data were analyzed estimating the coefficient of heritability (hmi ), on a
progeny mean basis and the genetic coefficient of variation (CVgi) for each subpopulation. The traits considered
were: plant height and the respective diameter and the corresponding annual rates of increment. Estimates of
gene diversity (Hei) and fixation index (fi), available for the same subpopulations, based on isozymes, SSR
and RAPD markers, were taken for comparison. Simple linear correlation and multiple regression analysis
were used for measuring the association between those estimates on intra and interpopulation level. The
weak correlation between gene diversity estimated with codominant and dominant markers reduced the
expectation of a good correlation between those statistics and the genetic variation of the quantitative traits.
In general, the possibility to infer the magnitude of quantitative variation within subpopulations, based on
molecular gene diversity, was not confirmed. RAPD results were more promising, indicating the importance
to have an adequate genomic coverage in this kind of research. On the other hand, the interpopulation level,
a much better association was detected for all markers. The possibility of predicting quantitative variation
based on molecular information was, therefore, not excluded.
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Correlação, Correlation, Regressão múltipla, Conservação genética, Marcadores moleculares, Caracteres quantitativos, Multiple regression, Genetic conservation, Molecular marker, Quantitative traits
Citação
AGUIAR, Ananda Virginia de et al. Relação entre a variação genética de caracteres quantitativos e marcadores moleculares em subpopulações de cagaiteira (Eugenia dysenterica DC). Revista Brasileira de Fruticultura, Jaboticabal, v. 33, n. 1, p. 157-169, mar. 2011.