Patterns of vegetative growth and gene flow in Rhizopogon vinicolor and R. vesiculosus (Boletales, Basidiomycota)

We have collected sporocarps and tuberculate ectomycorrhizae of both Rhizopogon vinicolor and Rhizopogon vesiculosus from three 50 × 100 m plots located at Mary's Peak in the Oregon Coast Range (USA); linear map distances between plots ranged from c. 1 km to c. 5.5 km. Six and seven previously...

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Bibliographic Details
Published in:Molecular ecology 2005-07, Vol.14 (8), p.2259-2268
Main Authors: Kretzer, A.M, Dunham, S, Molina, R, Spatafora, J.W
Format: Article
Language:English
Subjects:
alleles
Basidiomycota - genetics
Basidiomycota - growth & development
cell growth
Demography
DNA, Ribosomal Spacer - genetics
Ecology
ectomycorrhizae
false-truffles
Flowers & plants
Fungi
gene flow
Genes
genetic markers
genetic structure
Genetic Variation
Genetics
Genetics, Population
genotype
loci
microsatellite markers
microsatellite repeats
Microsatellite Repeats - genetics
mycelium
mycophagy
Oregon
Polymorphism, Restriction Fragment Length
population genetics
Rhizopogon
Rhizopogon veisculosus
Rhizopogon vinicolor
spatial distribution
Species Specificity
spore dispersal
tuberculate ectomycorrhizae
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Summary:We have collected sporocarps and tuberculate ectomycorrhizae of both Rhizopogon vinicolor and Rhizopogon vesiculosus from three 50 × 100 m plots located at Mary's Peak in the Oregon Coast Range (USA); linear map distances between plots ranged from c. 1 km to c. 5.5 km. Six and seven previously developed microsatellite markers were used to map the approximate size and distribution of R. vinicolor and R. vesiculosus genets, respectively. Genetic structure within plots was analysed using spatial autocorrelation analyses. No significant clustering of similar genotypes was detected in either species when redundant samples from the same genets were culled from the data sets. In contrast, strong clustering was detected in R. vesiculosus when all samples were analysed, but not in R. vinicolor. These results demonstrate that isolation by distance does not occur in either species at the intraplot sampling scale and that clonal propagation (vegetative growth) is significantly more prevalent in R. vesiculosus than in R. vinicolor. Significant genetic differentiation was detected between some of the plots and appeared greater in the more clonal species R. vesiculosus with ΦST values ranging from 0.010 to 0.078*** than in R. vinicolor with ΦST values ranging from −0.002 to 0.022** (*P 
ISSN:0962-1083
1365-294X
DOI:10.1111/j.1365-294X.2005.02547.x