DEPRESSÃO POR ENDOGAMIA EM POPULAÇÕES DE JEQUITIBÁ-ROSA
DOI:
https://doi.org/10.24278/2178-5031.2001131629Keywords:
Cariniana legalis, isozymes, ex situ conservation, inbreeding, forest tree improvement.Abstract
This research studies the inbreeding effects on three populations of jequitibá-rosa - Cariniana lega/is (Mart.) O. Ktze., with 17 years old of experimentation, planted in two localit1es 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 all individuais was measured for quantitative traits, stem shape, DBH, height and wood volume and using 14 polymorph1c isozymes loci. The individuais of each population were grouped in five classes based on d1ameter and they were estimated by their respective phenotypic average of the traits, observed heterozygosity and fixation índex. The analysis of linear regression among traits and index of d1versity, showed the tendency in increasing in grown w1th 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 allelic frequencies of each group, has indicated with the detected inbreeding is function of the mating system and not of the selection, suggesting that the individuais of smaller performance should be the result of the inbreeding effects. The quantifícation · 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.
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