High gene flow through pollen partially compensates spatial limited gene flow by seeds for a Neotropical tree in forest conservation and restoration areas

Autor(es)

Sujii, Patricia Sanae ^{[1, 2]} ; Tambarussi, Evandro Vagner ^{[3, 4]} ; Grando, Carolina ^[1] ; de Aguiar Silvestre, Ellida ^[1] ; Viana, Joao Paulo Gomes ^[1] ; Brancalion, Pedro H. S. ^[5] ; Zucchi, Maria Imaculada ^[6]

Afiliação do(s) autor(es)

^[1] Univ Estadual Campinas, Inst Biol, Dept Genet Evolucao & Bioagentes, BR-13083970 Campinas, SP - Brazil

^[2] Ctr Univ Dist Fed, Nucleo Biol Aplicada, BR-70390045 Brasilia, DF - Brazil

^[3] Univ Estadual Ctr Oeste UNICENTRO, Dept Engn Florestal, PR 153, Km 7, BR-84500000 Irati, PR - Brazil

^[4] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Programa Posgrad Recursos Florestais, BR-13418900 Piracicaba, SP - Brazil

^[5] Univ Sao Paulo, Escola Super Agr Luiz de Queiroz, Dept Ciencias Florestais, BR-13418900 Piracicaba, SP - Brazil

^[6] Agencia Paulista Tecnol Agronegocios, Polo Reg Ctr Sul, Piracicaba - Brazil

• Tipo de documento: Artigo Científico
• Fonte: CONSERVATION GENETICS; v. 22, n. 3, p. 383-396, JUN 2021.
• Citações Web of Science: 2

Resumo

Gene flow may occur both through pollen movement and seed dispersal, although their relative contribution to overall species gene flow is not understood for most tropical trees, which compromises management recommendations. We investigated the implications of seed dispersal limitation, pollen dispersal capacity, and mating system to the spatial genetic structure of populations of the Neotropical legume tree, Centrolobium tomentosum, in Brazil's Atlantic Forest. We estimated seed dispersal distribution by counting individuals around adult trees; pollen dispersal distribution and outcrossing rates from adult and offspring genotypes, using seven microsatellite loci. Spatial genetic structure was inferred through the correlation among kinship coefficients and geographical distances between pairs of individuals, using nuclear and chloroplast microsatellite markers. We observed restricted seed dispersal, with most seeds (78%) falling up to 10 m from the adult tree trunk. The best-fitted pollen dispersal distribution was the exponential power distribution, with a heavy tail and average pollen dispersal distance of 3191 m. The mating system was preferably allogamous, with an average of eight pollen donors. There was significant spatial genetic structure in all populations, with stronger structure obtained from chloroplast DNA, which suggests that the restricted gene flow by seed dispersal may be compensated by high outcrossing rates and long-distance pollen flow promoted by the large bees that pollinate the species. Our results emphasize the importance of pollination services in fragmented tropical landscapes, where most tree species are pollinated by animals and a large number of species experience seed dispersal limitation. (AU)

• Processo FAPESP: 11/50296-8 - Biologia da conservação de espécies nativas da Mata Atlântica com potencial fitoterápico: uma abordagem genética sobre restaurações florestais
• Beneficiário: Maria Imaculada Zucchi
• Modalidade de apoio: Auxílio à Pesquisa - Programa BIOTA - Regular
• Processo FAPESP: 12/03246-8 - Diversidade, estrutura genética e sistema reprodutivo em Centrolobium tomentosum Guillem ex. Bentham (Fabaceae) visando subsidiar enriquecimento genético em áreas de restauração florestal
• Beneficiário: Patricia Sanae Sujii
• Modalidade de apoio: Bolsas no Brasil - Doutorado