Title:	Mating system variation among populations, individuals and within and among fruits in Bertholletia excelsa.
Authors:	WADT, L. H. de O. BALDONI, A. B. SILVA, V. S. CAMPOS, T. de MARTINS, K. AZEVEDO, V. C. R. MATA, L. R. da BOTIN, A. A. HOOGERHEIDE, E. S. S. TONINI, H. SEBBENN, A. M.
Affiliation:	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.
Date Issued:	2015
Citation:	Silvae Genetica, Deutschland, v. 64, p. 5-6, 2015.
Description:	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.
Thesagro:	Melhoramento genético vegetal Reprodução vegetal Essência florestal Castanha do pará Bertholletia excelsa População de planta Polinização Marcador genético Campo Experimental Flora
NAL Thesaurus:	Plant breeding Tropical wood Brazil nuts Pollination Anthropogenic activities Genetic markers Microsatellite repeats
Keywords:	Castanha do brasil Ação antrópica Marcador microssatélite Embrapa Acre Rio Branco (AC) Acre Amazônia Ocidental Western Amazon Amazonia Occidental Embrapa Recursos Genéticos e Biotecnologia Mato Grosso Actividades antropogénicas Madera tropical Fitomejoramiento Marcadores genéticos Nuez del Brasil Polinización Repeticiones de microsatélite
ISSN:	0037-5349
Type of Material:	Artigo de periódico
Access:	openAccess
Appears in Collections:	Artigo em periódico indexado (CPAF-AC)