Patterns of molecular evolution in dioecious and non-dioecious Silene

0440410 - BFÚ 2015 RIV GB eng J - Článek v odborném periodiku
Kaefer, J. - Talianová, Martina - Bigot, T. - Michu, Elleni - Gueguen, L. - Widmer, A. - Žlůvová, Jitka - Glemin, S. - Marais, G.A.B.
Patterns of molecular evolution in dioecious and non-dioecious Silene.
Journal of Evolutionary Biology. Roč. 26, č. 2 (2013), s. 335-346. ISSN 1010-061X. E-ISSN 1420-9101
Grant CEP: GA ČR(CZ) GA521/08/0932; GA ČR(CZ) GD204/09/H002; GA ČR(CZ) GBP501/12/G090
Institucionální podpora: RVO:68081707
Klíčová slova: purifying selection * reproductive systems * Silene latifolia
Kód oboru RIV: BO - Biofyzika
Impakt faktor: 3.483, rok: 2013

Dioecy (i.e. having separate sexes) is a rather rare breeding system in flowering plants. Such rareness may result from a high probability of extinction in dioecious species because of less efficient dispersal and the costs of sexual selection, which are expected to harm dioecious species' survival on the long term. These handicaps should decrease the effective population size (Ne) of dioecious species, which in turn should reduce the efficacy of selection. Moreover, sexual selection in dioecious species is expected to specifically affect some genes, which will evolve under positive selection. The relative contribution of these effects is currently unknown and we tried to disentangle them by comparing sequence evolution between dioecious and non-dioecious species in the Silene genus (Caryophyllaceae), where dioecy has evolved at least twice. For the dioecious species in the section Melandrium, where dioecy is the oldest, we found a global reduction of purifying selection, while on some, male-biased genes, positive selection was found. For section Otites, where dioecy evolved more recently, we found no significant differences between dioecious and non-dioecious species.
Trvalý link: http://hdl.handle.net/11104/0243564