Dipteryx alata Vogel (Fabaceae) a neotropical tree with high level of selfing: implication for conservation and breeding programs

Authors

  • Evandro Vagner Tambarussi Universidade Estadual do Centro-Oes-te, Departamento de Engenharia Florestal, PR 153, Km 7, 84500-000, Irati, PR, Brazil & Programa de Pós-Graduação em Ciência Florestal, Faculdade de Ciências Agronômicas, Universidade Estadual Paulista, Rua José Barbosa de Barros, 1780, Portaria II: Rodovia Alcides Soares, Km 3, 18610-307, Botu-catu, SP, Brazil
  • Alexandre M. Sebbenn Instituto Florestal de São Paulo, CP 1322, São Paulo, SP, 01059-970, Brazil & Programa de Pós-Graduação em Agronomia, Universidade Estadual Paulista, Av. Brasil Centro 56, CP 31, Ilha Solteira, SP, 15385-000, Brazil
  • Alessandro Alves-Pereira Escola Superior de Agricultura “Luiz de Queiroz”, Av. Pádua Dias, 11, PO Box 9, 13418-090, Piracicaba, SP, Brazil
  • Roland Vencovsky Escola Superior de Agricultura “Luiz de Queiroz”, Av. Pádua Dias, 11, PO Box 9, 13418-090, Piracicaba, SP, Brazil
  • Jose Cambuim Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista, Av. Brasil Centro 56, CP 31, Ilha Solteira, SP, 15385-000, Brazil
  • Alexandre da Silva Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista, Av. Brasil Centro 56, CP 31, Ilha Solteira, SP, 15385-000, Brazil
  • Marcela Moraes Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista, Av. Brasil Centro 56, CP 31, Ilha Solteira, SP, 15385-000, Brazil
  • Mario L.T. de Moraes Faculdade de Engenharia de Ilha Solteira, Universidade Estadual Paulista, Av. Brasil Centro 56, CP 31, Ilha Solteira, SP, 15385-000, Brazil

DOI:

https://doi.org/10.15287/afr.2017.842

Keywords:

Conservation genetics, microsatellite markers, population genetics, TWOGENER analysis

Abstract

Dipteryx alata (Fabaceae) is a threatened tropical tree of the Brazilian Savanna. Due to deforestation of its biome, many individuals and populations are now spatially isolated in forest fragments, pastures, and along roads. Plans for in situ and ex situ conservation of the species are urgently needed. To support conservation, the mating system and pollen dispersal patterns must be better understood as they determine the levels of genetic diversity, inbreeding, and effective size of seed generations. Microsatellite were used to investigated the mating system, pollen dispersal, genetic diversity, spatial genetic structure (SGS), and inbreeding in isolated trees in pastures and along roads from two populations with different densities in the Brazilian Savanna. Our aim is to determine the potential of these trees to contribute to seed collection for genetic conservation. We found that the species presents a mixed mating system, strong individual variation in outcrossing rate (0.01-1.0), and non-random mating. Low population density resulted in lower levels of outcrossing (tm = 0.45) and mating among relatives (tm - ts = 0.12), but longer pollen dispersal distances (δ = 6,572 m) than in the higher density populations (tm = 0.90, tm - ts = 0.26, δ = 1,395 m). Mating among relatives was explained by SGS detected in the populations, associated with near-neighbor pollinator foraging behavior. Correlated mating indicates that a low effective number of pollen donors (1.5-10.3) fertilized the trees. Thus, open-pollinated seedling families present mixtures of different levels of relatedness and inbreeding. Our results are discussed in light of strategies for in and ex situ conservation.

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2017-09-15

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Vol. 60 No. 2 (2017)

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