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

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Annals of Forest Science : Volume 65, Issue 6, January 2008

Annals of Forest Science : Volume 65, Issue 5, January 2008

Annals of Forest Science : Volume 65, Issue 4, January 2008

Annals of Forest Science : Volume 65, Issue 3, January 2008

Annals of Forest Science : Volume 65, Issue 2, January 2008

Annals of Forest Science : Volume 65, Issue 1, January 2008

Annals of Forest Science : Volume 64

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

Content Provider	Springer Nature Link
Author	Fernandes, Lúcia Rocheta, Margarida Cordeiro, Jorge Pereira, Sandra Gerber, Sophie Oliveira, Maria M. Ribeiro, Maria M.
Copyright Year	2008
Abstract	• 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. • L’apparentement entre parents, la variation de fertilité entre clones et la pollution pollinique font dévier le gain génétique réalisé et la diversité génétique des valeurs attendues en verger à graines de clones à pollinisation libre, en particulier pour une espèce à pollinisation anémophile comme Pinus pinaster Aiton. • Ce travail étudie la variation génétique, le système de reproduction et la contamination du pollen d’un verger à graines de clones (VGC) de P. pinaster, en génotypant les 60 clones du VGC et les graines récoltées sur 21 arbres-mères pour trois marqueurs microsatellites nucléaires. • La diversité attendue s’est révélée similaire mais l’hétérozygotie observée a diminué de 20 % chez les descendants par rapport aux parents. Le taux d’allofécondation était de 90,1 %, la consanguinité biparentale calculée grâce à une approche multilocus était de 21,7 % et le taux d’autofécondation observé était de 52,4 %. • D’après ces résultats, nous avons conclu que les flux de gènes observés et la consanguinité biparentale étaient élevés et que des précautions devaient être prises dans la mise en place et la gestion de futurs VGC, l’apparentement entre clones devrait en particulier être vérifié et le nombre de copies d’un individu pourrait être directement proportionnel à sa valeur génétique.
Starting Page	706
Ending Page	706
Page Count	1
File Format	PDF
ISSN	12864560
Journal	Annals of Forest Science
Volume Number	65
Issue Number	7
e-ISSN	1297966X
Language	French
Publisher	Springer Netherlands
Publisher Date	2008-01-01
Publisher Institution	Institut National de la Recherche Agronomique (INRA)
Publisher Place	Dordrecht
Access Restriction	Subscribed
Subject Keyword	variation génétique système de reproduction flux de gènes microsatellites pin maritime Forestry Wood Science & Technology Forestry Management Tree Biology Environment
Content Type	Text
Resource Type	Article
Subject	Ecology Forestry

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