No evidence of population structure across three isolated subpopulations of Russula brevipes in an oak/pine woodland

作者：Bergemann SE^*; Douhan GW; Garbelotto M; Miller SL

来源：New Phytologist, 2006, 170(1): 177-184.

DOI：10.1111/j.1469-8137.2006.01654.x

• allele
• dispersal
• ectomycorrhiza (EM)
• gene flow
• microsatellite

Russula brevipes is common ectomycorrhizal (EM) fungus that is associated with several hosts across temperate forest ecosystems. A previous study has demonstrated that substructuring across large geographic distances (1500 km) occurs in the western USA.
To examine genetic structure over a more localized scale, basidiocarps of Russula brevipes from three subpopulations, separated by distances of 230-1090 m, were collected over two consecutive years in an oak/pine woodland. Microsatellite loci were used to test for population differentiation both among subpopulations and by year.
No significant population differentiation was detected between subpopulations (theta(ST) = 0.01) or between years (theta(ST) = 0.01). Most loci were consistent with a Hardy-Weinburg equilibrium and 82% of the genets between seasons from similar sampling localities constituted new genotypes.
These results indicate that R. brevipes constitutes a randomly mating population with no genetic differentiation between locations or across successive fruiting seasons.

• 出版日期2006