Free access
Issue
Ann. For. Sci.
Volume 64, Number 1, January-February 2007
Page(s) 37 - 45
DOI http://dx.doi.org/10.1051/forest:2006086
Published online 16 January 2007
Ann. For. Sci. 64 (2007) 37-45
DOI: 10.1051/forest:2006086

The reproductive success of a Quercus petraea $\times $ Q. robur F1-hybrid in back-crossing situations

Ditte C. Olrik and Erik D. Kjaer

The Danish Centre for Forest, Landscape and Planning, The Royal Veterinary and Agricultural University, Hoersholm Kongevej 11, 2970 Hoersholm, Denmark

(Received 27 November 2005; accepted 28 September 2006; published online 16 January 2007)

Abstract - A 56 year old Quercus petraea $\times $ Q. robur F1-hybrid was back-crossed to both parental species. Pollen mixes were applied and paternity assigned to offspring based on microsatellite markers. The studied Q. petraea $\times $ Q. robur hybrid proved highly fertile and back-crossed well with both Q. robur and Q. petraea with slight but not significant preference for Q. robur. The results do not support the hypothesis about highly unidirectional gene flow between Q. robur and Q. petraea towards Q. robur as the observed back-crossing ability of the hybrid opens a route for nuclear gene flow from Q. robur to Q. petraea. However, Q. petraea $\times $ Q. robur hybrids may be rare in nature and the results do not tell us if the (probably more common) reciprocal hybrid also back-crosses easily to Q. petraea.


Résumé - Succès reproductif d'un hybride Quercus petraea $\times $ Q. robur en rétro-croisements. Un hybride de première génération de Quercus petraea $\times $ Q. robur, âgé de 56 ans, a été rétro-croisé avec chacune des deux espèces parentales. Un mélange pollinique a été appliqué et la paternité de la descendance a été déterminée grâce à des marqueurs micro-satellites. L'hybride étudié s'est révélé très fertile et se croise bien à la fois avec Q. robur et Q. petraea mais légèrement mieux quoique de manière non significative avec Q.robur. Nos résultats ne confirment donc pas l'hypothèse d'un flux génique unidirectionnel marqué entre Q. robur et Q. petraea en faveur de Q. robur. En effet, la faculté de rétro-croisement observée pour cet hybride ouvre aussi la voie à des flux géniques nucléaires de Q. robur vers Q. petraea. Cependant, il est possible que les hybrides Q. petraea $\times $ Q. robur soient rares dans la nature ; par ailleurs, les résultats obtenus ne nous disent pas si l'hybride réciproque (probablement plus fréquent) se croise facilement avec Q. petraea.


Key words: Quercus robur / Q. petraea / pollen fertility / reproductive success / introgression

Mots clés : Quercus robur / Q.  petraea / fertilité du pollen / succès reproductif / introgression

Corresponding author: dco@kvl.dk

© INRA, EDP Sciences 2007

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