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(Reference retrieved automatically from Google Scholar through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Genetic structure of natural populations of Cryptocarya aschersoniana Mez (Lauraceae) through isozyme markers

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Author(s):
Moraes, Pedro Luís Rodrigues de [1] ; Derbyshire, Maria Teresa Vitral de Carvalho [2]
Total Authors: 2
Affiliation:
[1] Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura - Brasil
[2] Universidade de São Paulo (USP). Centro de Energia Nuclear na Agricultura - Brasil
Total Affiliations: 2
Document type: Journal article
Source: Biota Neotropica; v. 2, n. 2, p. 0-0, 2003.
Field of knowledge: Biological Sciences - Genetics
Abstract

Through the analysis of 39 polymorphic allozyme loci, allele frequencies were estimated from 267 individuals of 12 natural populations of Cryptocarya aschersoniana native to “Planalto forests” of the state of São Paulo and south of Minas Gerais, Brazil. Estimates of Wright’s F statistics were computed through the analysis of variance for obtaining unbiased estimation of corresponding parameters F=FIT, θP =FST and f=FIS. Average values of F ˆ were 0.552 < 0.415 < 0.275; those of θˆ P were 0.395 < 0.335 < 0.279; and those of fˆ were 0.292 < 0.119 < -0.039. These results indicated that individuals within populations might be panmitic, and that the diversity among populations was fairly high, being superior to what would be expected for groups of plants having a full-sib family structure. From estimates of θˆ P obtained for populations taken two at a time, the model of isolation by distance was employed and it has shown to be inadequate for explaining the divergence found among populations. The estimated gene flow of 0.4 migrants per generation corroborated the pronounced populational differentiation. Due to negligible fˆ @ F ˆ IS values found, the variance effective size for each population was equivalent to its sampling number. Under a metapopulation context, considering the 12 populations sampled for the species, the effective population size was 15.4 individuals (5.77%) for the total sampled, indicating that sampling of different populations should be an important strategy for their management. (AU)

FAPESP's process: 99/05818-2 - Genetic structure of natural populations of Cryptocarya spp. (Lauraceae) through isoenzymatic and DNA markers
Grantee:Maria Teresa Vitral de Carvalho Derbyshire
Support type: BIOTA-FAPESP Program - Regular Research Grants