Current Genetics

, Volume 15, Issue 3, pp 221-229

First online:

Chloroplast ribosomal DNA organization in the chromophytic alga Olisthodiscus luteus

  • Terrence P. DelaneyAffiliated withDepartment of Botany, University of Washington
  • , Rose Ann CattolicoAffiliated withDepartment of Botany, University of Washington

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There are almost no data describing chloroplast genome organization in chromophytic (chlorophyll a/c) plants. In this study chloroplast ribosomal operon placement and gene organization has been determined for the golden-brown alga Olisthodiscus luteus. Ribosomal RNA genes are located on the chloroplast DNA inverted repeat structure. Nucleotide sequence analysis, demonstrated that in contrast to the larger spacer regions in land plants, the 16S–23S rDNA spacer of O. luteus is only 265 by in length. This spacer contains tRNAIle and tRNAAla genes which lack introns and are separated by only 3 bp. The sequences of the tRNA genes and 16S and 23S rDNA termini flanking the spacer were examined to determine homology between O. luteus, chlorophytic plant chloroplast DNA, and prokaryotes.

Key words

Chloroplast DNA Chlorophyll a/c alga Evolution Ribosomal operon