Genetic variation, mating patterns and gene flow in a Pinus pinaster Aiton clonal seed orchard

Fernandes, Lúcia; Rocheta, Margarida; Cordeiro, Jorge; Pereira, Sandra; Gerber, Sophie; Oliveira, Maria M.; Ribeiro, M.M.A.

http://hdl.handle.net/10400.11/668

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Abstract(s)

Relatedness among parents, variation in clonal fertility and background pollination deviate the realized genetic gain and the gene diversity of open pollinated seed orchard from expectation, in particular in wind pollinated species such as Pinus pinaster Aiton. • This work investigates the genetic variation, the mating system and the pollen contamination in a P. pinaster clonal seed orchard (CSO), by screening the 60 clones from the CSO and the seeds collected from 21 mother-trees with three nuclear microsatellites. • The expected diversity was similar, but the observed heterozygosity decreased 20% in the progenies compared with the parental trees. The outcrossing rate was 90.1%, the biparental inbreeding 21.7% computed through a multilocus approach, and the observed selfing 3.9%. The observed gene flow from outside the CSO was 52.4%. • From the results we concluded that the observed gene flow and the biparental inbreeding were high, and care should be taken in the implementation and management of future CSO, in particular clones should be checked for relatedness and the ramet number could be directly proportional to their breeding value.

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The original publication is available at/A publicação original encntra-se disponível em: www.afs-journal.org

Keywords

Genetic variation Mating system Gene flow Simple sequence repeats Maritime pine

URI

http://hdl.handle.net/10400.11/668

Citation

FERNANDES, L. [et al.] (2008) - Genetic variation, mating patterns and gene flow in a Pinus pinaster Aiton clonal seed orchard. Ann. For. Sci. ISSN 1286-4560. 65.