Comparison of morphological characters and molecular markers for the analysis of hybridization in sessile and pedunculate oak

Baciliéri, Roberto; Ducousso, Alexis; Kremer, Antoine

doi:10.1051/forest:19960106

Cited by 33 publications

(35 citation statements)

References 12 publications

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“…These observed gene frequencies in progenies from Q. robur could be explained by fertilization of a proportion of female flowers by pollen of Q. petraea [4,6]. A similar indication of unidirectional gene flow in the same stand was observed when using RAPDs [5].…”

Section: Evidence Of Asymmetric Hybridization and Unidirectional Genesupporting

confidence: 61%

“…Such a back-crossing pathway can explain the difficulties in finding species specific genetic markers in either the nuclear or cytoplasmic genomes of Q. robur and Q. petraea [4-6, 10, 15, 17, 20, 21]. Also, the fact that several morphological characters are needed to separate species support the theory of evolutionary significant introgression [5,11] although the two species can be separated by using several morphological characters in combination (e.g. [2,18,22]).…”

Section: Levels Of Gene Flow Between Q Petraea and Q Roburmentioning

confidence: 94%

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

Olrik

Kjær

2007

Ann. For. Sci.

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-A 56 year old Quercus petraea × 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 × 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 × 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.Quercus robur / Q. petraea / pollen fertility / reproductive success / introgression Résumé -Succès reproductif d'un hybride Quercus petraea × Q. robur en rétro-croisements. Un hybride de première génération de Quercus petraea × 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 × 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.Quercus robur / Q. petraea / fertilité du pollen / succès reproductif / introgression

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Section: Evidence Of Asymmetric Hybridization and Unidirectional Genesupporting

confidence: 61%

Section: Levels Of Gene Flow Between Q Petraea and Q Roburmentioning

confidence: 94%

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

Olrik

Kjær

2007

Ann. For. Sci.

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“…However, these correlation coefficients were quite low, and for most populations, the degree of genetic and morphological intermediacy indicated by frequency distributions of hybrid index scores and morphological discriminant scores ( Fig. 2A (Bacilieri et al, 1996a;Kremer et al, 2002). Possible explanations for this phenomenon include maternal effects (i.e., hybrids are more similar to the species of their maternal parent), as well as selection against intermediate forms (Bacilieri et al, 1996a;Kremer et al, 2002).…”

Section: Discussionmentioning

confidence: 89%

“…2A (Bacilieri et al, 1996a;Kremer et al, 2002). Possible explanations for this phenomenon include maternal effects (i.e., hybrids are more similar to the species of their maternal parent), as well as selection against intermediate forms (Bacilieri et al, 1996a;Kremer et al, 2002). In a mixed stand of Q. lobata and Q. douglasii, Craft et al (2002) found phenotypically intermediate trees that had little evidence of mixed ancestry according to microsatellites.…”

Section: Discussionmentioning

confidence: 90%

Morphological and RAPD analysis of hybridization betweenQuercus affinisandQ. laurina(fagaceae), two Mexican red oaks

González‐Rodríguez

Arias

Valencia

et al. 2004

American J of Botany

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Quercus affinis and Q. laurina are two closely related Mexican red oaks with partially overlapping distributions. Within the area of overlap, there are localities where morphological intergradation occurs. A previous hypothesis explained this pattern as a result of secondary contact between the two species, followed by hybridization and introgression. This possibility was analyzed here by examining foliar and genetic variation in 16 localities situated along a macrogeographic gradient, which included morphologically representative populations of both species and populations from within the area of overlap. Maximum-likelihood hybrid index scores calculated from nine semi-diagnostic RAPD markers indicated a shift in the genetic composition of populations from one species to the other along the macrogeographic gradient, with genetically intermediate populations situated in the area of overlap. Foliar variation followed a partially congruent pattern, but Q. laurina-like morphology predominated in some of the genetically intermediate populations. There were several instances of correlated frequency changeovers of single RAPD markers and morphological characters along the macrogeographic gradient and a few cases of markedly parallel patterns between markers. The results were interpreted as consistent with a hypothesis of secondary contact between the two oak species that has resulted in some differential introgression among markers.

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“…Despite weak interspecific barriers, oak species involved in interspecific crosses usually remain distinct at the morphological, physiological, genetic and ecological levels (Whittemore and Schaal, 1991). In previous studies, hybrid oak individuals or populations have been reported to combine the morphological traits of both parental species (eg Bacilieri et al, 1996), and countless oak species have been described as hybrids, exclusively on the basis of morphological observations (Castroviejo et al, 1990). Their hybrid origin should in most of these situations be ascertained through genetic analysis, which, together with ecological studies, should also ensure that the assumed hybrid species is not a transient population.…”

Section: Introductionmentioning

confidence: 99%

Endemic North African Quercus afares Pomel originates from hybridisation between two genetically very distant oak species (Q. suber L. and Q. canariensis Willd.): evidence from nuclear and cytoplasmic markers

Mir

Toumi²,

Jarne

et al. 2005

Heredity

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Hybridisation is a potent force in plant evolution, although there are few reported examples of stabilised species that have been created through homoploid hybridisation. We focus here on Quercus afares, an endemic North African species that combines morphological, physiological and ecological traits of both Q. suber and Q. canariensis, two phylogenetically distant species. These two species are sympatric with Q. afares over most of its distribution. We studied two Q. afares populations (one from Algeria and one from Tunisia), as well as several populations of both Q. suber and Q. canariensis sampled both within and outside areas where these species overlap with Q. afares. A genetic analysis was conducted using both nuclear (allozymes) and chloroplastic markers, which shows that Q. afares originates from a Q. suber Â Q. canariensis hybridisation. At most loci, Q. afares predominantly possesses alleles from Q. suber, suggesting that the initial cross between Q. suber and Q. canariensis was followed by backcrossing with Q. suber. Other hypotheses that can account for this result, including genetic drift, gene silencing, gene conversion and selection, are discussed. A single Q. suber chlorotype was detected, and all Q. afares individuals displayed this chlorotype, indicating that Q. suber was the maternal parent. Q. afares is genetically, morphologically and ecologically differentiated from its parental species, and can therefore be considered as a stabilised hybrid species.

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Comparison of morphological characters and molecular markers for the analysis of hybridization in sessile and pedunculate oak

Cited by 33 publications

References 12 publications

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

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

Morphological and RAPD analysis of hybridization betweenQuercus affinisandQ. laurina(fagaceae), two Mexican red oaks

Endemic North African Quercus afares Pomel originates from hybridisation between two genetically very distant oak species (Q. suber L. and Q. canariensis Willd.): evidence from nuclear and cytoplasmic markers

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