Abstract:
:Quercus petraea and Quercus robur are two closely related oak species that frequently hybridize. We sequenced 70 clones containing the 5.8S and ITS2 regions of ribosomal DNA (rDNA) from these two species and did not detect a species-specific difference. Surprisingly, three divergent (up to 12.6%) rDNA families were identified in both species, indicating that they predate the speciation event. Despite a large between-rDNA-families divergence, rDNA sequences were very similar within families, suggesting ongoing concerted evolution. Expression analysis, relative-rate tests, and mutation spectrum analyses indicated that only a single rDNA family is functional. We propose that past hybridization events, combined with nucleolar dominance, were the evolutionary processes underlying the contemporary rDNA variability in Q. petraea and Q. robur.
journal_name
Mol Biol Evoljournal_title
Molecular biology and evolutionauthors
Muir G,Fleming CC,Schlötterer Cdoi
10.1093/oxfordjournals.molbev.a003785subject
Has Abstractpub_date
2001-02-01 00:00:00pages
112-9issue
2eissn
0737-4038issn
1537-1719journal_volume
18pub_type
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