COMPORTAMENTO DA VARIAÇÃO GENÉTICA ENTRE E DENTRO DE PROCEDÊNCIAS E PROGÊNIES DE Vell. Moq. PARA CARACTERES QUANTITATIVOS
DOI:
https://doi.org/10.24278/2178-5031.2009212220Keywords:
ex situ conservation, provenance and progenies test, Brazilian tree species, quantitative geneticsAbstract
The aims of this study were to evaluate the behavior of genetic parameters a long of time in a provenance and progeny test of tree species, G. integrifolia established in the Luiz Antônio Experimental Station - EELA, and the effects of different intensity of selection within progenies on the effective population size maintained in the test. The trial was established in 1981 with 17 to 21 progenies of three provenances from São Paulo State (Ribeirão Preto, Campinas and Bauru), using six repetitions, and five plants per subplot. The diameter at breast height - DBH, height, volume and survival were measured at 2, 4, 6, 8 and 23 years of age. Significant differences among provenances, progenies/provenances, interaction provenances and years and interaction progenies/ provenance and years were detected for great majority of the studied traits. The provenance Ribeirão Preto, located nearest to EELA, showed the highest survival rate and significant higher growth rate than the others provenances for majority of the study traits. The genetic variation among provenances was reduced with increase in the age of the trees, while the genetic variation among progenies/provenances increased over the time. The coefficient of genetic variation for volume increased throughout the times and for DBH, height and survival was stable. The coefficient of heritability within progenies for DBH, height and volume was stable over the years. The coefficient of heritability among progenies for height also was stable over the years, but for DBH, volume and survival it showed the tendency to increase with increasing of the years. Finally, the selection of six trees per progeny was determined as the best options to maintain the effective population size in the test and to produce seed with wide genetic base.
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