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Auteur Lene R. Nielsen
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Forest & Landscape, Faculty of Biosciences, Copenhagen University, Hørsholm Kongevej 11, 2970 Hørsholm, Denmark
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Hybridization between Quercus robur and Q. petraea in a mixed oak stand in Denmark / J. Jensen in Annals of Forest Science, Vol 66 n° 7 (October - November 2009)
[article]
Titre : Hybridization between Quercus robur and Q. petraea in a mixed oak stand in Denmark Titre original : Hybridation entre Quercus robur et Q. petraea dans un peuplement mélangé de chênes au Danemark Type de document : Article/Communication Auteurs : J. Jensen, Auteur ; Anders Larsen, Auteur ; Lene R. Nielsen, Auteur ; Joan Cottrell, Auteur Année de publication : 2009 Article en page(s) : n° 706 Note générale : Bibliographie Langues : Anglais (eng) Descripteur : [Termes IGN] Danemark
[Termes IGN] diversité génétique
[Termes IGN] hybridation naturelle (végétation)
[Termes IGN] peuplement mélangé
[Termes IGN] Quercus pedunculata
[Termes IGN] Quercus sessiliflora
[Vedettes matières IGN] SylvicultureRésumé : (Editeur) Hybridization and mating pattern between Quercus robur and Q. petraea was studied in a 5.8 ha mixed forest stand in Jutland, Denmark which comprises in total 135 Quercus robur and 230 Q. petraea trees. Classification of the oak trees into species was performed using canonical discriminant analysis of a range of leaf morphological traits. Adult trees (365) and offspring (582) were genotyped with eight microsatellite markers. Seedlings were sampled in 2003 and acorns were collected in 2004. Mating patterns of Q. robur and Q. petraea are expected to be different in the northern range of the distribution area and a larger hybridization rate is expected. It is further expected, that pollination from outside sources will be relatively less in small fragmented forest management systems compared to large scale oak forest. The conclusions should be verified through repeated year to year analysis of the mating pattern. Phenological studies revealed that there was no difference in flowering time between species. Data for the adult trees revealed no significant departures from Hardy-Weinberg proportions and there was weak, but significant spatial genetic structure, which supports the idea that the stand is of natural origin. Spatial genetic structure in the first distance class is stronger for Q. petraea. The genetic composition of the offspring was remarkably consistent from year to year. Paternity analysis revealed that, on average, 85% pollination came from fathers within the stand. The direction of the pollen flow varied from year to year. Inter-specific hybridization was high and ranged from 15–17% and from 48–55% for Q. petraea and Q. robur mothers respectively. Paternity analysis revealed that the population was basically outcrossing and only 3.7% of the analysed progeny were the product of selfing. Over the two years of study, approximately 200 trees contributed to the paternity of the next generations.
The study confirms earlier studies with a greater tendency for Q. robur mothers to produce hybrid seeds than Q. petraea mothers. The rate of hybridization is higher in this Danish stand than in comparable studies elsewhere in Europe. Gene flow from outside sources are relatively low.Numéro de notice : A2009-627 Affiliation des auteurs : non IGN Thématique : FORET Nature : Article nature-HAL : ArtAvecCL-RevueIntern DOI : 10.1051/forest/2009058 Date de publication en ligne : 02/10/2009 En ligne : https://www.afs-journal.org/articles/forest/full_html/2009/07/f08308/f08308.html Format de la ressource électronique : url article Permalink : https://documentation.ensg.eu/index.php?lvl=notice_display&id=72830
in Annals of Forest Science > Vol 66 n° 7 (October - November 2009) . - n° 706[article]Exemplaires(1)
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