Université de Neuchâtel

Evolutionary conflicts and ecological constraints at reproduction in the dioecious plant Silene latifolia

Burkhardt, Anne ; Bernasconi, Giorgina (Dir.) ; Benrey, Betty (Codir.)

Thèse de doctorat : Université de Neuchâtel, 2009.

Les fleurs sont d’une étonnante diversité de formes et de couleurs. Les plantes ayant des sexes séparés (dioécie) sont d’un intérêt particulier car différentes pressions de sélection peuvent s’exercer sur les deux sexes, amenant à l’évolution d’un dimorphisme sexuel des fleurs. De nombreuses études ont montré que les pollinisateurs favorisaient les plantes à grandes ou...

Université de Neuchâtel

How does breeding system variation modulate sexual antagonism?

Bedhomme, Stéphanie ; Bernasconi, Giorgina ; Koene, Joris M. ; Lankinen, Åsa ; Arathi, H. S. ; Michiels, Nico K. ; Anthes, Nils

In: Biology Letters, 2009, vol. 23, no. 5, p. 660-662

The study of sexually antagonistic (SA) traits remains largely limited to dioecious (separate sex), mobile animals. However, the occurrence of sexual conflict is restricted neither by breeding system (the mode of sexual reproduction, e.g. dioecy or hermaphroditism) nor by sessility. Here, we synthesize how variation in breeding system can affect the evolution and expression of intra- and...

Université de Neuchâtel

Within/between population crosses reveal genetic basis for siring success in Silene latifolia (Caryophyllaceae)

Jolivet, Céline ; Bernasconi, Giorgina

In: Journal of Evolutionary Biology, 2007, vol. 20, no. 4, p. 1361-1374

Divergence at reproductive traits can generate barriers among populations, and may result from several mechanisms, including drift, local selection and co-adaptation between the sexes. Intersexual co-adaptation can arise through sexually antagonistic co-evolution, a timely hypothesis addressed in animals but, to our knowledge, not yet in flowering plants. We investigated whether male and female...

Université de Neuchâtel

Effects of inbred/outbred crosses on progeny sex ratio in Silene latifolia (Caryophyllaceae)

Teixeira, Sara ; Bernasconi, Giorgina

In: New Phytologist, 2008, vol. 178, no. 2, p. 448-456

• Sex ratio polymorphism has been extensively studied in Silene latifolia, but it is neither known whether inbreeding (which is likely to occur under field conditions) affects it, nor which of the proposed mechanisms (Y degeneration, X-linked drive) is more important. Both mechanisms predict reduced pollen performance. • In this study, females were crossed with pollen from related...

Université de Neuchâtel

Male moths provide pollination benefits in the Silene latifolia–Hadena bicruris nursery pollination system

Labouche, Anne-Marie ; Bernasconi, Giorgina

In: Functional Ecology, 2010, vol. 24, no. 3, p. 534-544

1. Evolutionary conflicts of interest underlie mutualisms, including plant/pollinator interactions. This is particularly evident in 'nursery pollination', in which the pollinators lay eggs inside the flowers and the offspring of the pollinator consume the developing seeds. Low benefit (pollination service) to cost (seed predation) ratios could destabilize such associations towards...