| Title: | Hybrid sterility and inviability in the parasitic fungal species complex Microbotryum |
| Author(s): | De Vienne DM; Refregier G; Hood ME; Guigue A; Devier B; Vercken E; Smadja C; Deseille A; Giraud T; |
| Address: | "Ecologie, Systematique et Evolution, Universite Paris-Sud, Orsay Cedex, France" |
| DOI: | 10.1111/j.1420-9101.2009.01702.x |
| ISSN/ISBN: | 1420-9101 (Electronic) 1010-061X (Linking) |
| Abstract: | "Microbotryum violaceum, the anther-smut fungus, forms a complex of sibling species which specialize on different plants. Previous studies have shown the presence of partial ecological isolation and F1 inviability, but did not detect assortative mating apart from a high selfing rate. We investigated other post-mating barriers and show that F1 hybrid sterility, the inability of gametes to mate, increased gradually with the increasing genetic distance between the parents. F2 hybrids showed a reduced ability to infect the plants that was also correlated with the genetic distance. The host on which the F2 hybrids were passaged caused a selection for alleles derived from the pathogen species originally isolated from that host, but this effect was not detectable for the most closely related species. The post-mating barriers thus remain weak among the closest species pairs, suggesting that premating barriers are sufficient to initiate divergence in this system" |
| Keywords: | "Basidiomycota/genetics/*physiology Chimera/*physiology Chromosome Segregation/genetics Genome, Fungal/genetics Genotype Germ Cells/physiology Receptors, Pheromone/genetics;" |
| Notes: | "MedlineDe Vienne, D M Refregier, G Hood, M E Guigue, A Devier, B Vercken, E Smadja, C Deseille, A Giraud, T eng Research Support, Non-U.S. Gov't Research Support, U.S. Gov't, Non-P.H.S. Switzerland 2009/02/21 J Evol Biol. 2009 Apr; 22(4):683-98. doi: 10.1111/j.1420-9101.2009.01702.x. Epub 2009 Feb 18" |
