Genetic diversity and structure of Podocarpus lambertii Klotzsch ex Endl. populations in the mixed ombrophilous forest of Santa Catarina state

• Autor(a) principal: Bittencourt, Ricardo
• Data de Publicação: 2019
• Outros Autores: Steiner, Felipe, Sant'Anna, Cristina Silva, Montagna, Tiago, Fernandes, Caio Darós, Silva, Fernando André Loch Santos da, Reis, Maurício Sedrez dos
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Ciência Florestal (Online)
• Texto Completo: https://periodicos.ufsm.br/cienciaflorestal/article/view/4449
• topic: Allozymes; Fixation index; In situ conservation; Conifer; Alozimas; Índice de fixação; Conservação in situ; Conífera

Podocarpus lambertii (Podocarpaceae) is popularly known in Brazil as pinheiro-bravo. It occurs in several forest formations of the Atlantic Rain Forest, mainly in the Ombrophilous Mixed Forest. Due to the high wood exploitation suffered by the species, it is listed as ‘Almost Threatened’ in The IUCN Red List of Threatened Species. In face of this, the objective of the present study was to characterize the genetic diversity and structure of 12 natural populations of Podocarpus lambertii in Santa Catarina state, aiming to generate information for the defnition of effective conservation strategies for the species. To access genetic diversity levels and distribution, it was used 10 allozymic systems. Along with the assistance of the software Fstat, the allelic frequencies (A), polymorphic loci percentage (P), observed heterozigosity (Ho), expected heterozigosity, fixation index (f) and genetic divergence between populations (FST) were calculated. In 11 loci 32 alleles (A=1,8) were detected. A low genetic diversity was detected for Podocarpus lambertii populations (P100%=52,7; HO=0,049; HE=0,079). The mean fxation index obtained (f=0,374) indicates a defcit of heterozygous individuals. A high number of low frequency alleles was detected and together with the high genetic divergence (FST=0,303), it points towards the necessity of in situ conservation of a large number of Podocarpus lambertii populations and the need to increase the connectivity among the remnant populations.