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Genetics of pinus pinaster Aiton with cytoplasmic and nuclear markers

dc.contributor.authorRibeiro, M.M.A.
dc.date.accessioned2010-10-27T16:54:58Z
dc.date.available2010-10-27T16:54:58Z
dc.date.issued2001
dc.descriptionTese de Doutoramento apresentada no Department of Forest Genetics and Plant Phisiology da Swedish University of Agricultural Sciences, em Umeapor
dc.description.abstractThis thesis summarizes and discusses results of three studies in which biochemical and molecular techniques were used to study the genetic variation in Pinus pinaster. In particular, the investigation focused on: (i) the within- and among-population genetic diversity in the region hypothesised as a putative refugium for the species during the last glaciation; (ii) the comparison of nuclear and cytoplasmic estimates of diversity within and between two regions of the species; and (iiii) the design of a test for provenance identification using knowledge about the levels of genetic variation between the two regions. The distribution of the genetic variation of P. pinaster in Portugal, as revealed by chloroplast microsatellites (cpSSR), indicated that there are low levels of differentiation among populations and that the diversity is found mainly within populations. No discernable geographic pattern was found. Evidences of strong anthropogenic influence associated with extensive gene flow could explain these findings. Fossil, charcoal and palynological records supported the presence of the species in Portugal before and during the last glaciation; therefore, the hypothesis of a putative refugium in this country cannot be excluded. The genetic variation of 24 populations from France and Portugal was investigated with amplified fragments length polymorphisms (AFLPs) and cpSSRs. Both types of markers could discriminate between the two provenances and the diversity of the French provenance was higher compared with that from Portugal. Similar differentiation estimates were found with nuclear and cytoplasmic markers. Extensive gene flow could account for this result, but higher mutation rates and homoplasy at cpSSR loci are not to be excluded. Despite the different modes of inheritance, a high correlation was found between the genetic distances matrices with both types of markers, which suggests that migration surpassed genetic drift in moulding the genetic structure of this species in the regions studied. A provenance diagnostic test was designed, based on cpSSRs, to screen the putative origin of stands of P. pinaster in southwestern France and compared with the currently used terpene-based test. Five stands of unknown origin were diagnosed with both tests. The cpSSR-based test proved to be faster and more accurate to determine if stands were of French or northwest Iberian (Portugal and Galicia) origin. The result obtained was probably due to the higher capability of the DNA-based markers to discriminate between both provenances, compared to that of the terpene markers.por
dc.identifier.citationRIBEIRO, Maria Margarida Chagas de Ataíde (2001) - Genetics of pinus pinaster Aiton with cytoplasmic and nuclear markers. Umea : Swedish University of Agricultural Sciences. 47 p. Doctoral Thesis.por
dc.identifier.isbn91-576-6061-1
dc.identifier.issn1401-6230
dc.identifier.tid101102011
dc.identifier.urihttp://hdl.handle.net/10400.11/420
dc.language.isoengpor
dc.publisherSwedish University of Agricultural Sciencespor
dc.relation.ispartofseriesActa Universitatis Agriculturae Sueciae - Silvestriae;177
dc.subjectCPSSRpor
dc.subjectAFLPpor
dc.subjectTerpenespor
dc.subjectGenetic variationpor
dc.subjectProvenance identificationpor
dc.subjectPinus pinasterpor
dc.titleGenetics of pinus pinaster Aiton with cytoplasmic and nuclear markerspor
dc.typedoctoral thesis
dspace.entity.typePublication
oaire.citation.conferencePlaceUmeapor
oaire.citation.titleGenetics of pinus pinaster Aiton with cytoplasmic and nuclear markerspor
person.familyNameRibeiro
person.givenNameMaria Margarida
person.identifier349097
person.identifier.ciencia-idAD12-4D32-7A48
person.identifier.orcid0000-0003-4684-1262
person.identifier.ridM-4235-2013
person.identifier.scopus-author-id7201715611
rcaap.rightsopenAccesspor
rcaap.typedoctoralThesispor
relation.isAuthorOfPublicationf5b33ec3-9c90-4cc9-b0c4-c86c7ec0b017
relation.isAuthorOfPublication.latestForDiscoveryf5b33ec3-9c90-4cc9-b0c4-c86c7ec0b017

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