Genetic diversity, spatial genetic structure and realised seed and pollen dispersal of Himatanthus drasticus (Apocynaceae) in the Brazilian savanna

Autor(es)

Baldauf, Cristina ^{[1, 2, 3]} ; Ciampi-Guillardi, Maisa ^{[3, 4]} ; Aguirra, Thaisa Jacinto ^[3] ; Correa, Christiane Erondina ^[5] ; Maes dos Santos, Flavio Antonio ^[1] ; de Souza, Anete Pereira ^{[1, 3]} ; Sebbenn, Alexandre Magno ^[6]

Afiliação do(s) autor(es)

^[1] State Univ Campinas UNICAMP, Dept Plant Biol, BR-13083970 Campinas, SP - Brazil

^[2] Fed Rural Univ Semiarid Reg UFERSA, Dept Anim Sci, BR-59625900 Mossoro, RN - Brazil

^[3] State Univ Campinas UNICAMP, Genet Engn & Mol Biol Ctr, BR-13083875 Campinas, SP - Brazil

^[4] Univ Sao Paulo ESALQ USP, Dept Plant Pathol, BR-13418900 Piracicaba, SP - Brazil

^[5] Univ Fed Minas Gerais, Inst Biol, BR-31270901 Belo Horizonte, MG - Brazil

^[6] Sao Paulo Forestry Inst, BR-01059970 Sao Paulo - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CONSERVATION GENETICS; v. 15, n. 5, p. 1073-1083, OCT 2014.
• Citações Web of Science: 12

Resumo

We assessed the pollen and seed dispersal patterns, genetic diversity, inbreeding and spatial genetic structure of Himatanthus drasticus (Apocynaceae), a tree native to the Brazilian Savanna (Cerrado) that is heavily exploited for its medicinal latex. The study was conducted in the Araripe National Forest, Ceara State, Brazil. Within a one-hectare plot, samples were collected from all adult trees, adult trees located in the immediate vicinity of the plot, and seedlings. All sampled individuals were mapped and genotyped using microsatellite markers. High levels of polymorphism and significant levels of inbreeding were found, which indicates that self-fertilisation and mating among relatives occur in this population. Both the adults and seedlings had significant spatial genetic structure up to similar to 40 m and our results confirmed the occurrence of isolation by distance. Pollen and seeds were dispersed over short distances and immigration of pollen and seeds into the plot was estimated at 13 and 9 %, respectively. Taking into consideration the degree of inbreeding, relatedness, intrapopulation spatial genetic structure and pollen dispersal distance, we recommend collecting seeds from a large number of trees spaced at least 150 m apart to avoid collecting seeds from related individuals and an overlap of pollen pools among seed trees. (AU)

• Processo FAPESP: 08/08737-4 - Avaliação do impacto ecológico do extrativismo sobre populações de duas espécies de cerrado: Mauritia flexuosa L.f (Arecaceae) e Himatanthus drasticus (Mart.) Plumel (Apocynaceae)
• Beneficiário: Flavio Antonio Maës dos Santos
• Modalidade de apoio: Auxílio à Pesquisa - Regular