Data/hora: 09/06/2024 06:45:12

Biblioteca(s): | Embrapa Acre.
Data corrente: | 16/03/2020
Data da última atualização: | 02/07/2021
Autoria: | OLIVEIRA, S. S. de; CAMPOS, T. de; SEBBENN, A. M.; OLIVEIRA, M. V. N. d'.
Afiliação: | Sabrina Silva de Oliveira, Universidade Federal do Acre (Ufac); TATIANA DE CAMPOS, CPAF-AC; Alexandre Magno Sebbenn, Instituto Florestal de São Paulo; MARCUS VINICIO NEVES D OLIVEIRA, CPAF-AC.
Título: | Using spatial genetic structure of a population of Swietenia macrophylla King to integrate genetic diversity into management strategies in Southwestern Amazon.
Ano de publicação: | 2020
Fonte/Imprenta: | Forest Ecology and Management, v. 464, n. 15, 118040, May 2020.
ISSN: | 0378-1127
DOI: | 10.1016/j.foreco.2020.118040
Idioma: | Inglês
Conteúdo: | The aims of this study were to investigate the intrapopulation spatial genetic structure (SGS) of a preserved Swietenia macrophylla population in a managed forest in Southwestern Amazon, in Acre state, Brazil, and assess the genetic parameters that underlie the conceptual framework that guides conservation and management strategies. The study was conducted in Annual Production Unit (APU) 3, where 83 adult trees (DBH?40 cm) were mapped (1650 ha). The diameter at breast height (DBH) was measured and the vascular exchange was sampled. Leaf tissues were collected from 187 juvenile individuals within a radius of 20m of adults. The population presented high heterozygosity (Ho) for adult (0.767) and juvenile (0.763) individuals, but significantly high allelic richness (R) and significantly lower fixation index (F) in adults (R =10.3, F =0.048) than juveniles (R =9.3, F= 0.119). The F value significantly higher for juveniles, suggesting selection against inbred individuals between juvenile and adult life stages. SGS was detected for adults up to 300 m. Mating was mainly through outcrossing (0.97-1.0), but some crossing occurred among related trees (0.02-0.16) and were correlated (rpm =0.06-0.22), indicating a mean effective number of pollen donors ranging from 4.5 to 18.2. Pollen dispersal distances reached 3905m (mean of 1472 m), and mean effective pollination neighbor area of 792 ha. The effective population size (Ne) within family (2.73) was lower than expected for random mating populations. The number of trees (m) required for seed collection was estimated at 55 non-inbreed and not related trees to each other. The core collection consisted of 42 (50.6%) adults across the area. These individuals should be included in seed collection as they represent 100% of the total detected genetic diversity. The inclusion of S. macrophylla on the list of species available for exploitation is not indicated, because the species requires cross breeding for its maintenance and logging reduce the Ne and may negatively impact the pattern of genetic diversity. These will significantly increase the risk of genetic erosion and population extinction due to a lack of adaptive ability. Adults serve as pollen donors that ecologically and genetically contribute to the maintenance of gene flow and Ne. Because it is recognized as a threatened species worldwide, and due to the fact that in areas of natural occurrence the species presents low-density and shows difficulty establishing natural regeneration, we recommend that S. macrophylla be protected from selective logging.
Palavras-Chave: | Acre; Bujari (AC); Estructura poblacional; Estrutura genética espacial; Floresta Estadual do Antimary (AC); Mahogany; Repeticiones de microsatélite; Sena Madureira (AC); Southwestern Amazon; Sudoeste da Amazônia.
Thesagro: | Características Agronômicas; Conservação; Genética Vegetal; Marcador Genético; Mogno; Parâmetro Genético; População de Planta; Swietenia Macrophylla.
Thesaurus Nal: | Agronomic traits; Genetic markers; Loci; Microsatellite repeats; Population structure.
Categoria do assunto: | G Melhoramento Genético
URL: | http://ainfo.cnptia.embrapa.br/digital/bitstream/item/211864/1/26982.pdf
Registro original: | Embrapa Acre (CPAF-AC)
Exemplares: | CPAF-AC - (26982-1) - UPC - AP - DD -  -  -  - DIS