Diferenciação genética e diversidade em populações naturais de Cryptocarya aschersoniana Mez (Lauraceae)

Authors

  • Pedro Luís Rodrigues de Moraes Universidade Estadual de Campinas, Departamento de Botânica
  • Maria Teresa Vitral de Carvalho Derbyshire Universidade de São Paulo, CENA, Laboratório de Melhoramento de Plantas

Keywords:

allozymes, Lauraceae, genetic distance, genetic variability, population differentiation, Neotropics, Cryptocarya aschersoniana, Atlantic Forest, Brazil

Abstract

The genetic variability and structure of natural populations of Cryptocarya aschersoniana Mez were investigated by means of isozymes. Leaf samples of 267 adult individuals were collected from 12 populations native of "Floresta de Planalto" of the State of São Paulo and Southern Minas Gerais State, Brazil. From 39 polymorphic allozyme loci analysed, the divergence obtained through G ST estimates suggests the existence of significant genetic drift and/or natural selectioneffects between populations. The level of gene differentiation ( ĜST = 0.340) was extremely high. The within sample gene diversity (H S = 0.365) account for 66.12% of the overall gene diversity, indicating a greater variability occurring within populations than among them. Goodness of fit tests for mutation-drift equilibrium showed that none of these populations was in equilibrium. From coancestry distance of Reynolds, divergences between pair of populations were also relatively high, which could be associated to bottleneck effects due to present forest fragmentation in analysed populations.

Downloads

Published

2003-01-01

How to Cite

Moraes, P. L. R. de, & Derbyshire, M. T. V. de C. (2003). Diferenciação genética e diversidade em populações naturais de Cryptocarya aschersoniana Mez (Lauraceae). Biota Neotropica, 3(1). Retrieved from //www.biotaneotropica.org.br/BN/article/view/1117

Issue

Section

Articles
Loading...