Three divergent rDNA clusters predate the species divergence in Quercus petraea (Matt.) Liebl. and Quercus robur L.

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 Evol

authors

Muir G,Fleming CC,Schlötterer C

doi

10.1093/oxfordjournals.molbev.a003785

subject

Has Abstract

pub_date

2001-02-01 00:00:00

pages

112-9

issue

2

eissn

0737-4038

issn

1537-1719

journal_volume

18

pub_type

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