Mating system variation among populations, individuals and within and among fruits in Bertholletia excelsa

Autor: Helio Tonini, E. S. S. Hoogerheide, Alexandre Magno Sebbenn, L.R. Mata, Karina Martins, Tatiana de Campos, Aisy Botega Baldoni, V. S. Silva, Lúcia Helena de Oliveira Wadt, V.C.R. Azevedo, Andreia Alves Botin
Přispěvatelé: LUCIA HELENA DE OLIVEIRA WADT, CPAF-Rondonia, AISY BOTEGA BALDONI TARDIN, CPAMT, Universidade Federal do Acre, TATIANA DE CAMPOS, CPAF-Acre, Universidade Federal de São Carlos, VANIA CRISTINA RENNO AZEVEDO, Cenargen, LORENA RAMOS DA MATA, Cenargen, Universidade Federal de Mato Grosso, EULALIA SOLER SOBREIRA HOOGERHEIDE, CPAMT, HELIO TONINI, CPAMT, Instituto Florestal de São Paulo.
Předmět:
Fitomejoramiento
Bertholletia excelsa
População de planta
Repeticiones de microsatélite
medicine.disease_cause
Pasture
Plant breeding
Flora
Fixation index
Microsatellite repeats
Campo Experimental
Mating
Pollination
Marcador microssatélite
geography.geographical_feature_category
Forestry
Tropical wood
Polinização
Reprodução vegetal
Natural population growth
Castanha do pará
Nuez del Brasil
Polinización
Madera tropical
Ação antrópica
Marcadores genéticos
Essência florestal
Melhoramento genético vegetal
Embrapa Recursos Genéticos e Biotecnologia
Actividades antropogénicas
Outcrossing
Biology
Acre
Marcador genético
Mato Grosso
Rio Branco (AC)
Pollen
Botany
Genetics
medicine
geography
Castanha do brasil
biology.organism_classification
Mating system
Agronomy
Seedling
Amazonia Occidental
Anthropogenic activities
Genetic markers
Embrapa Acre
Amazônia Ocidental
Western Amazon
Brazil nuts
Zdroj: Scopus-Elsevier
Repositório Institucional da EMBRAPA (Repository Open Access to Scientific Information from EMBRAPA-Alice)
Empresa Brasileira de Pesquisa Agropecuária (Embrapa)
instacron:EMBRAPA
Popis: The aim of this study was to investigate variation in mating system among three Brazilian Amazon populations of the tree Bertholletia excelsa with different levels of anthropogenic interventions. We collected open-pollinated seeds from one natural population, remnant trees dispersed in a pasture, and trees from a plantation. Outcrossing rate not varied among the populations and indicates that all seeds were originated from outcrossing (tm=1.0). Mating among relatives was significant higher in the plantation than forest and pasture populations, probably due the fact that many trees are related in the plantation. Correlated mating was significantly higher in pasture (rp=0.47) and plantation (rp=0.51) than in the natural population (rp=0.22), suggesting that trees in natural population are pollinated by a higher number of pollen donors. The paternity correlation was significantly higher within (rp(w)=0.41) than among fruits (rp(a)=0.18), showing a higher probability to find full-sibs within than among fruits. The fixation index was generally lower in seed trees than in their seedlings, suggesting selection for heterozygous individuals from seedling to adult stages. Progeny arrays collected from the natural population had a lower proportion of pairwise full-sibs than in pasture and plantation and higher variance effective size (2.75) than trees in pasture (2.15) and plantations (2.22). Results highlight that seed collections for conservation, breeding and reforestation programs preferentially should be carried out in natural populations due low proportion highest variance effective size within progeny.
Databáze: OpenAIRE
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