Host-related genetic differentiation in the anther smut fungus Microbotryum violaceum in sympatric, parapatric and allopatric populations of two host species Silene latifolia and S. dioica

TY - JOUR

T1 - Host-related genetic differentiation in the anther smut fungus Microbotryum violaceum in sympatric, parapatric and allopatric populations of two host species Silene latifolia and S. dioica

AU - Van Putten, W.F.

AU - Biere, A.

AU - Van Damme, J.M.M.

N1 - Reporting year: 2005 Metis note: 3445; CTE; PVP ; TE file:///L:/Endnotedatabases/NIOOPUB/pdfs/Pdfs2005/VanPutten_ea_3445.pdf

PY - 2005

Y1 - 2005

N2 - We investigated genetic diversity in West European populations of the fungal pathogen Microbotryum violaceum in sympatric, parapatric and allopatric populations of the host species Silene latifolia and S. dioica, using four polymorphic microsatellite loci. In allopatric host populations, the fungus was highly differentiated by host species, exhibiting high values of FST and RST, and revealed clear and distinct host races. In sympatric and parapatric populations we found significant population differentiation as well, except for one sympatric population in which the two host species grew truly intermingled. The mean number of alleles per locus for isolates from each of the host species was significantly higher in sympatric/parapatric than in allopatric populations. This suggests that either gene flow between host races in sympatry, or in case of less neutral loci, selection in a more heterogeneous host environment can increase the level of genetic variation in each of the demes. The observed pattern of host-related genetic differentiation among these geographically spread populations suggest a long-term divergence between these host races. In sympatric host populations, both host races presumably come in secondary contact, and host-specific alleles are exchanged depending on the amount of fungal gene flow. [KEYWORDS: allopatry ; anther smuts ; host races ; microsatellites ; population structure ; ympatry]

AB - We investigated genetic diversity in West European populations of the fungal pathogen Microbotryum violaceum in sympatric, parapatric and allopatric populations of the host species Silene latifolia and S. dioica, using four polymorphic microsatellite loci. In allopatric host populations, the fungus was highly differentiated by host species, exhibiting high values of FST and RST, and revealed clear and distinct host races. In sympatric and parapatric populations we found significant population differentiation as well, except for one sympatric population in which the two host species grew truly intermingled. The mean number of alleles per locus for isolates from each of the host species was significantly higher in sympatric/parapatric than in allopatric populations. This suggests that either gene flow between host races in sympatry, or in case of less neutral loci, selection in a more heterogeneous host environment can increase the level of genetic variation in each of the demes. The observed pattern of host-related genetic differentiation among these geographically spread populations suggest a long-term divergence between these host races. In sympatric host populations, both host races presumably come in secondary contact, and host-specific alleles are exchanged depending on the amount of fungal gene flow. [KEYWORDS: allopatry ; anther smuts ; host races ; microsatellites ; population structure ; ympatry]

KW - NIOO/CTE/PVP

U2 - 10.1111/j.1420-9101.2004.00771.x

DO - 10.1111/j.1420-9101.2004.00771.x

M3 - Article

SN - 1010-061X

VL - 18

SP - 203

EP - 212

JO - Journal of Evolutionary Biology

JF - Journal of Evolutionary Biology

IS - 1

ER -