Depressão por endogamia em populações de jequitibá-rosa
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Data
2001
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Resumo
This research studies the inbreeding
effects on three populations of jequitibá-rosa -
Cariniana legalis (Mart.) O. Ktze., with 17 years
old of experimentation, planted in two localities of
São Paulo State. The assay was implanted in 1982,
in compact family block design with the purpose of
ex situ conservation. One third of alI individuais
was measured for quantitative traits, stem shape,
DBH, height and wood volume and using 14
polymorphic isozymes loci. The individuais of
each population were grouped in five classes based
on diameter and they were estimated by their
respective phenotypic average of the traits,
observed heterozygosity and fixation index. The
analysis of linear regression among traits and index
of diversity, showed the tendency in increasing in
grown with increásing of heterozygosity and
reduction of the inbreeding, suggesting that it is
happening selection in favor to heterozygous.
However, the analysis of genetic divergence
among alIelic frequencies of each group, has
indicated with the detected inbreeding is fúnction
of the mating system a!1d. not of the selection,
suggesting that the individuals of smaller
performance should be the result of the inbreeding
effects. The quantification : of inbreeding effects
showed 20%, 68%, 63% and 90% to stem shape,
DBH, height and wood volume, respectively. They
were also appraised the implications of those
results for ex situ conservation and for the genetic
improvement.
Descrição
Palavras-chave
Cariniana legalis, Eletroforese de isoenzimas, Depressão por endogamia, Conservação ex situ, Melhoramento florestal, Cariniana legalis, Isozymes, Ex situ conservation, Inbreeding, Forest tree improvement
Citação
SEBBENN, Alexandre Magno et al. Depressão por endogamia em populações de jequitibá-rosa. Revista do Instituto Florestal, São Paulo, v. 13, n. 1, p. 61-81, 2001.