High levels of genetic differentiation and selfing in the Brazilian cerrado fruit tree Dipteryx alata Vog. (Fabaceae)
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Data
2010-01-01
Autores
Tarazi, Roberto
Moreno, Maria Andreia
Gandara, Flavio Bertin
Ferraz, Elza Martins
Teixeira Moraes, Mario Luiz [UNESP]
Vinson, Christina Cleo
Ciampi, Ana Yamaguishi
Vencovsky, Roland
Kageyama, Paulo Yoshio
Título da Revista
ISSN da Revista
Título de Volume
Editor
Soc Brasil Genetica
Resumo
Dipteryx alata is a native fruit tree species of the cerrado (Brazilian savanna) that has great economic potential because of its multiple uses. Knowledge of how the genetic variability of this species is organized within and among populations would be useful for genetic conservation and breeding programs. We used nine simple sequence repeat (SSR) primers developed for Dipteryx odorata to evaluate the genetic structure of three populations of D. alata located in central Brazil based on a leaf sample analysis from 101 adults. The outcrossing rate was evaluated using 300 open-pollinated offspring from 25 seed-trees. Pollen dispersal was measured by parentage analysis. We used spatial genetic structure (SGS) to test the minimal distance for harvesting seeds in conservation and breeding programs. Our data indicate that the populations studied had a high degree of genetic diversity ((H) over cap (e) = 0.619) and population structure, as suggested by the high level of divergence among populations ((G) over cap'(ST) = 0.803). The estimated outcrossing rate ((t) over cap (m) = 0.711) suggested a mixed mating system, and the intrapopulation fixation index was influenced by SGS. We conclude that seed harvesting for genetic conservation and breeding programs requires a minimum distance between trees of 196 m to avoid collecting seeds from related seed-trees.
Descrição
Palavras-chave
Dipteryx alata, genetic structure, mating system, SSR
Como citar
Genetics and Molecular Biology. Ribeirao Pret: Soc Brasil Genetica, v. 33, n. 1, p. 78-85, 2010.