Diversidade e estrutura genética de Pilosocereus aureispinus: uma espécie de cactácea vulnerável e microendêmica

• Ano de defesa: 2015
• Autor(a) principal: Ribeiro, Paulianny de Moura
• Orientador(a): Moraes, Evandro Marsola de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Federal de São Carlos; Câmpus Sorocaba
• Programa de Pós-Graduação: Programa de Pós-Graduação em Diversidade Biológica e Conservação - PPGDBC-So
• Palavras-chave em Português: Genética de populações; Cacto - genética; Diversidade genética
• Palavras-chave em Inglês: Population genetics; Cactus - genetics; Genetic diversity
• Área do conhecimento CNPq: CIENCIAS BIOLOGICAS::GENETICA::GENETICA VEGETAL
• Link de acesso: https://repositorio.ufscar.br/handle/20.500.14289/8358

Pilosocereus aureispinus (Buining & Brederoo) F. Ritter is a narrow endemic columnar cactus of eastern Brazil, occurring at Ibotirama and Oliveira dos Brejinhos, Bahia. In this work the genetic diversity and population structure were assessed for eight microsatellite loci in four P. aureispinus localities of occurrence, covering its known distribution. Genetic diversity levels were relatively high (A = 4,2 e HE = 0,451) comparing with closely related species and other narrowly distributed plant species. Significant Hardy-Weinberg Equilibrium departures and linkage disequilibrium were not detected. Private alleles in low frequencies and low levels of genetic structure (FST =0,071 e G”ST = 0,132) were detected. STRUCTURE software analysis did not identified structure, showing that samples from four analyzed localities represent a unique genetic group (K=1). These results pointed to high level of ongoing gene flow among sampled localities, which may counteract differentiation effects and genetic diversity loss. Despite P. aureispinus is not suffering genetic variability erosion due its narrow distribution, the species should be classified as endangered (EN) at IUCN Red List of Threatened Species due existent anthropogenic disturbs in regions where it occurs.