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Evolution of nuclear rDNA its sequences in the Cladophora albida/sericea clade (Chlorophyta) by Freek T. Bakker; Jeanine L. Olsen; Wytze T. Stam is a Biochemistry, Genetics and Molecular Biology article available to read on EtoBox.

What is Evolution of nuclear rDNA its sequences in the Cladophora albida/sericea clade (Chlorophyta) about?

Ribosomal DNA ITS sequences were compared among 13 different species and biogeographic isolates from the monophyletic "albida/sericea clade" in the green algal genus Cladophora. Six distinct ITS sequence types were found, characterized by multiple insertions and deletions and high levels of nucleotide substitution. Conserved domains within the ITS regions indicate the presence of ITS secondary structure. Low transition/transversion ratios among the six types and nearly symmetrical tree-length frequency distributions indicate some saturation, and low phylogenetic signal. Although branching order among five of the six ITS sequence types could not be resolved, estimates of ITS sequence divergence as compared with 18S divergence in a subset of the taxa suggests that the origin of the different ITS types is probably in the mid-Miocene (12 Ma ago) but that biogeographic isolates within a single ITS type (including both Pacific and Atlantic representatives) have probably dispersed on a time scale of thousands rather than millions of years.

Who reads Evolution of nuclear rDNA its sequences in the Cladophora albida/sericea clade (Chlorophyta)?

Author

Freek T. Bakker; Jeanine L. Olsen; Wytze T. Stam

Publisher

Springer; Springer-Verlag; Springer Verlag; Springer Science and Business Media LLC (ISSN 0022-2844)

Published

1995

Language

EN

Field

Biochemistry, Genetics and Molecular Biology (Life Sciences)