Nuclear ribosomal DNA (nrDNA) concerted evolution in natural and artificial hybrids of <i>Armeria</i> (Plumbaginaceae)

Molecular Ecology - Tập 8 Số 8 - Trang 1341-1346 - 1999
Javier Aguilar1, Ricarda Riina2, Gonzalo Nieto Feliner1
1Real Jardín Botánico, CSIC, Plaza de Murillo 2, 28014 Madrid, Spain
2Departamento de Biología Vegetal, Universitat de Valencia, Burjassot, 46100 Valencia, Spain

Tóm tắt

AbstractNuclear ribosomal DNA (nrDNA) internal transcribed spacer (ITS) sequences from artificial hybrids and backcrosses between Armeria villosa ssp. longiaristata and A. colorata were studied to assess the possible effects of concerted evolution in natural hybrids. F1 artificial hybrids show the expected pattern of additive polymorphisms for five of the six variable sites as estimated from direct sequences. However, homogenization of polymorphism is already observed in the F2, and is biased towards A. colorata except for one site. In backcrosses, an expected tendency towards homogenization of polymorphic sites in the direction of the recurrent parent is observed for five sites, although this does not necessarily imply concerted evolution. Conversely, the sixth site appears to elude such a mechanism and thus provides additional support for the occurrence of biased concerted evolution. Our findings are relevant to interpreting phylogeographic patterns involving gene flow and are also consistent with the hypothesis of a hybrid origin of A. villosa ssp. carratracensis.

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Molecular Ecology

Tập 8 Số 8

1341-1346

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