Summary
The plastid genome of the brown alga Pylaiella littoralis (L.) Kjellm. is composed of two different circular DNA molecules: the largest carries two rrn operons, and the smallest, only one copy of both 16S and 23S rDNAs. 16S rDNA copies located on both molecules have been cloned and their nucleotide sequences determined: they are 65% homologous to one another. The expression of these genes was assayed by hybridizing in vivo labelled P. littoralis rRNAs to both clones, and specific oligonucleotides to total RNA from P. littoralis. Results indicate that the 16S rDNA copy located on the small molecule is a pseudogene. Comparisons of the functional gene with other 16S rRNA genes shows that chloroplasts from green plants emerged earlier from the cyanobacterial lineage than Euglena gracilis and Pylaiella littoralis plastids.
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Markowicz, Y., Loiseaux-de Goer, S. & Mache, R. Presence of a 16S rRNA pseudogene in the bi-molecular plastid genome of the primitive brown alga Pylaiella littoralis. Evolutionary implications. Curr Genet 14, 599–608 (1988). https://doi.org/10.1007/BF00434086
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DOI: https://doi.org/10.1007/BF00434086