Contrasting nuclear and cytoplasmic exchanges between phylogenetically distant oak species (Quercus suber L. and Q. ilex L.) in Southern France: inferring crosses and dynamics
Identifieur interne : 000704 ( Main/Exploration ); précédent : 000703; suivant : 000705Contrasting nuclear and cytoplasmic exchanges between phylogenetically distant oak species (Quercus suber L. and Q. ilex L.) in Southern France: inferring crosses and dynamics
Auteurs : C. Mir [France] ; P. Jarne [France] ; V. Sarda [France] ; A. Bonin [France] ; R. Lumaret [France]Source :
- Plant Biology [ 1435-8603 ] ; 2009-03.
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Abstract
Gene flow is particularly frequent in the genus Quercus (oaks), especially between closely related species. We focus here on Quercus ilex and the cork‐producing Quercus suber, which occasionally hybridize although they are phylogenetically markedly separated. Morphological observations were combined with both allozymic and chloroplastic diagnostic markers to characterize hybridization and introgression and to infer their dynamics in two French regions (French Catalonia and Provence), which are separated by several hundred kilometres. Some hybrids were found in both regions, indicating recent hybridization events. As expected from previous studies, most hybrids resulted from ♀Q. ilex × ♂Q. suber crosses, but our data showed that the reciprocal cross is also possible. Partial independence between nuclear and chloroplastic introgression was observed in the two species. Nuclear introgression was limited in both species and both regions, with no preferred direction. In Provence, chloroplastic introgression was very rare in both species. Conversely, all Q. suber individuals from French Catalonia were introgressed by Q. ilex chlorotypes. This might be explained by introgression in the Iberian Peninsula antedating the first occurrence of the two species in French Catalonia. We also observed a new chlorotype that was created locally, and was exchanged between the two species. However, the two species still remain genetically differentiated. The dynamics and complexity of exchanges and the factors determining them (including human management of Q. suber) are discussed.
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DOI: 10.1111/j.1438-8677.2008.00106.x
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We focus here on Quercus ilex and the cork‐producing Quercus suber, which occasionally hybridize although they are phylogenetically markedly separated. Morphological observations were combined with both allozymic and chloroplastic diagnostic markers to characterize hybridization and introgression and to infer their dynamics in two French regions (French Catalonia and Provence), which are separated by several hundred kilometres. Some hybrids were found in both regions, indicating recent hybridization events. As expected from previous studies, most hybrids resulted from ♀Q. ilex × ♂Q. suber crosses, but our data showed that the reciprocal cross is also possible. Partial independence between nuclear and chloroplastic introgression was observed in the two species. Nuclear introgression was limited in both species and both regions, with no preferred direction. In Provence, chloroplastic introgression was very rare in both species. Conversely, all Q. suber individuals from French Catalonia were introgressed by Q. ilex chlorotypes. This might be explained by introgression in the Iberian Peninsula antedating the first occurrence of the two species in French Catalonia. We also observed a new chlorotype that was created locally, and was exchanged between the two species. However, the two species still remain genetically differentiated. The dynamics and complexity of exchanges and the factors determining them (including human management of Q. suber) are discussed.</div></front></TEI><affiliations><list><country><li>France</li></country><region><li>Languedoc-Roussillon</li><li>Occitanie (région administrative)</li></region><settlement><li>Montpellier</li></settlement></list><tree><country name="France"><region name="Occitanie (région administrative)"><name sortKey="Mir, C" sort="Mir, C" uniqKey="Mir C" first="C." last="Mir">C. Mir</name></region><name sortKey="Bonin, A" sort="Bonin, A" uniqKey="Bonin A" first="A." last="Bonin">A. Bonin</name><name sortKey="Jarne, P" sort="Jarne, P" uniqKey="Jarne P" first="P." last="Jarne">P. Jarne</name><name sortKey="Lumaret, R" sort="Lumaret, R" uniqKey="Lumaret R" first="R." last="Lumaret">R. Lumaret</name><name sortKey="Sarda, V" sort="Sarda, V" uniqKey="Sarda V" first="V." last="Sarda">V. Sarda</name></country></tree></affiliations></record>Pour manipuler ce document sous Unix (Dilib)
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