Data/hora: 18/06/2024 04:58:43

Biblioteca(s): | Embrapa Florestas.
Data corrente: | 06/02/2007
Data da última atualização: | 13/02/2015
Autoria: | SOUSA, V. A. de; SEBBENN, A. M.; HATTEMER, H. H.; ZIEHE, M.
Título: | Correlated mating in populations of a dioecious brazilian conifer, Araucaria angustifolia (Bert.) O. Ktze.
Ano de publicação: | 2005
Fonte/Imprenta: | Forest Genetics, v. 12, n. 2, p. 107-119, 2005.
Idioma: | Inglês
Conteúdo: | The mating system in thirteen Aruucuriu ungustifbli~(B~ ert.) 0. Ktze populations from three regions in Brazil was investigated by using seven enzyme gene loci. The mating system of this wind-pollinated dioecious sub-tropical conifer was analyzed for correlated matings. The pollen allele frequencies were heterogeneous, indicating deviatio~sf r~mra ndom mating. Differences between multilocus and singlelocus mating system parameters (t,)? - t,) ranged from 0.01 8 to 0.061 and were significant for all populations,, sugges_ting a spatial genetic structure and biparental inbreeding. The estimated maternal fixation indices (F,#$w)e re statistically different from zero. Negative indices were observed in Campos do Jordiio-exploited forest, whereas in Irati and Capdor populations they were positive. The estimates of paternity correlations (r^ ) were significant and ranged from 0.106 to 0.602, with an average of 0.293 P among subpopulations. These results indicated that part of the sampled progeny were full-sibs and only a restricted number of pollen donors effectively contributed to the reproduction. The estimates of average coancestry within progenies was 0.1 62, ranging from 0.138 to 0.20. This was higher than expected for half-sibs. The average variance-effective size for progenies ranged between 2.50 and 3.62, with an average of 3.09 among populations. The variation among effective pollen clouds contributed markedly to the differentiation of the seed progeny collected from individual trees. These results are discussed in the context of genetic improvement strategies, gene conservation, and seed collection for restoring degraded forests
Palavras-Chave: | Coancestry; Correlação de paternidade; Effective pollen clouds; Mating system; Paternity correlation.
Thesagro: | Araucária Angustifólia; Linhagem; Polinização; Reprodução.
Thesaurus Nal: | population size.
Categoria do assunto: | --
Registro original: | Embrapa Florestas (CNPF)
Exemplares: | CNPF - (40642-1) - UPC - AP - DD -  -  -  - DIS