Observatorio de I+D+i UPM

Memorias de investigación
Research Publications in journals:
Detection of hybrids in nature: application to oaks (Quercus suber and Q. ilex)
Year:2009
Research Areas
  • Genetics,
  • Crop production
Information
Abstract
Powerful and accurate detection of first-generation (F1) hybrids and backcrosses in nature is needed to achieve a better understanding of the function and dynamics of introgression. To document the frequency of ongoing interspecific gene exchange between two Mediterranean evergreen oaks, the cork oak (Quercus suber) and the holm oak (Q. ilex), we analyzed 1487 individuals originating from across the range of the two species using eight microsatellite loci and two Bayesian clustering approaches (implemented in the programs STRUCTURE and NEWHYBRIDS). Simulated data were used to assess the differences between the two clustering methods and to back up the choice of the threshold value for the posterior probability to discriminate admixed from pure individuals. We found that the use of STRUCTURE resulted in the highest power to detect hybrids, whereas NEWHYBRIDS provided the highest accuracy. Irrespective of the approach, the two species were clearly distinguished as independent genetic entities without any prior information. In contrast with previous reports, we found no evidence for unidirectional introgression. The overall hybridization rate was very low (o2% of introgressed individuals). Only two individuals were identified as F1 hybrids and five as early backcrosses. This work shows that the combined application of the two complementary Bayesian approaches and their systematic validation with simulations, fit for the case at hand, helps gain resolution in the identification of admixed individuals.
International
Si
JCR
Si
Title
HEREDITY
ISBN
0018-067X
Impact factor JCR
3,823
Impact info
Volume
102
doi:10.1038/hdy.2009.8
Journal number
0
From page
442
To page
452
Month
ENERO
Ranking
Participants
  • Participante: Concetta Burgarella (INIA, España)
  • Participante: Roula Jabbour-Zahab (CNRS, Francia)
  • Participante: Remy Petit (INRA, Francia)
  • Autor: Zaida Lorenzo Rodríguez (UPM)
  • Autor: Alvaro Soto De Viana (UPM)
  • Participante: Erwan Guichoux (INRA, Francia)
  • Autor: Luis Alfonso Gil Sanchez (UPM)
  • Participante: Roselyne Lumaret (CNRS, Francia)
Research Group, Departaments and Institutes related
  • Creador: Grupo de Investigación: Genética y Fisiología Forestal
  • Departamento: Silvopascicultura
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