Abstract:
:The presence of divergent paralogues of nuclear ribosomal DNA, from the 18S-5.8S-26S cistron, is reported in members of Eucalyptus subg. Eucalyptus. These paralogues, which include non-functional pseudogenes, probably diverged prior to the differentiation of species groups in subg. Eucalyptus. When compared with presumably functional sequences, the pseudogenes show greater sequence variation between species, particularly in the 5.8S gene. They are also characterised by reduced GC content, associated with a reduced number of CpG and CpNpG methylation sites, and an increase in the inferred number of methylation-induced substitutions. Some pseudogenes also lack motifs that are usually conserved in plants, both in ITS1 and the 5.8S gene. Two main lineages of pseudogenes are identified, one isolated from a group of western Australian species, one from a group of eastern Australian species. It is not clear whether these two lineages of pseudogenes are orthologous, or represent independent divergences from functional sequence types. The presence of divergent rDNA paralogues highlights the need for caution when interpreting eucalypt phylogenies based on ITS sequences.
journal_name
Mol Phylogenet Evoljournal_title
Molecular phylogenetics and evolutionauthors
Bayly MJ,Ladiges PYdoi
10.1016/j.ympev.2006.10.027subject
Has Abstractpub_date
2007-07-01 00:00:00pages
346-56issue
1eissn
1055-7903issn
1095-9513pii
S1055-7903(06)00427-1journal_volume
44pub_type
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