Document Detail

The evolution of reproductive isolation in the ectomycorrhizal Hebeloma crustuliniforme aggregate (Basidiomycetes) in northwestern Europe: a phylogenetic approach.
MedLine Citation:
PMID:  11005288     Owner:  NLM     Status:  MEDLINE    
To reconstruct the evolution of reproductive isolation in the ectomycorrhizal Hebeloma crustuliniforme aggregate (Basidiomycetes), phylogenetic relationships were determined between strains that belong to a clade consisting of nine intercompatibility groups (ICGs, biological species). Four of these nine ICGs are partially compatible and belong to the H. crustuliniforme aggregate. Different levels of partial compatibility have been found between these four ICGs. Between ICGs 3 and 4, 15% of the combinations were compatible. One strain was compatible with all isolates of both ICGs 3 and 4 and also with one isolate of ICG 2. Both a nuclear phylogeny, based on ribosomal IGS sequence data, and a mitochondrial phylogeny, based on a group-I intron located in the large subunit ribosomal RNA gene (LrRNA), were reconstructed. The level of incompatibility was compared with the phylogenetic history of individuals belonging to this clade. Different relationships were found between the level of compatibility and the relative age of the most recent common ancestor (MRCA) for different ICGs. On the one hand, the evolution of incompatibility between ICGs 2 and 3/4 is most consistent with the class of "divergence- first" models because a positive correlation was found between the relative age of the MRCA and the level of incompatibility for ICG 2 versus 3/4. On the other hand, the lack of such a correlation for ICGs 3 and 4 shows that (partial) incompatibility between these ICGs has arisen without strong divergence. The ecological (and to a lesser extent geographical) differences found between ICGs 3 and 4 suggest that selection for incompatibility, associated with host tree preference, has been important in the evolution of incompatibility between these two ICGs. The incongruence between the nuclear and mitochondrial trees for ICG 1 could be explained by a hybrid origin of this ICG, with different donors of the mitochondrial and nuclear sequences.
D K Aanen; T W Kuyper; T H Mes; R F Hoekstra
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  Evolution; international journal of organic evolution     Volume:  54     ISSN:  0014-3820     ISO Abbreviation:  Evolution     Publication Date:  2000 Aug 
Date Detail:
Created Date:  2001-01-18     Completed Date:  2001-01-18     Revised Date:  2008-06-04    
Medline Journal Info:
Nlm Unique ID:  0373224     Medline TA:  Evolution     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  1192-206     Citation Subset:  IM    
Laboratory of Genetics, Wageningen Agricultural University, The Netherlands.
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MeSH Terms
Basidiomycota / classification,  genetics,  physiology*
DNA, Fungal / genetics
DNA, Mitochondrial / genetics
Evolution, Molecular
Species Specificity
Reg. No./Substance:
0/DNA, Fungal; 0/DNA, Mitochondrial

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