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- Title
The architecture of the chloroplast psbA- trnH non-coding region in angiosperms.
- Authors
Štorchová, H.; Olson, M. S.
- Abstract
The psbA- trnH intergenic region is among the most variable regions in the angiosperm chloroplast genome. It is a popular tool for plant population genetics and species level phylogenetics and has been proposed as suitable for DNA barcoding studies. This region contains two parts differing in their evolutionary conservation: 1) the psbA 3′UTR (untranslated region) and 2) the psbA- trnH intergenic non-transcribed spacer. We compared the sequence and RNA secondary structure of the psbA 3′ UTR across angiosperms and found consensus motifs corresponding to the stem portions of the RNA stem-loop structures and a consensus TTAGTGTATA box. The psbA- trnH spacer exhibited patterns that can be explained by the independent evolution of large inversions in the psbA 3′UTR and mutational hot spots in the remaining portion of the psbA- trnH spacer. We conclude that a comparison of chloroplast UTRs across angiosperms offer clues to the identity of putative regulatory elements and information about selective constraints imposed on the chloroplast non-coding regions.
- Subjects
CHLOROPLASTS; ANGIOSPERMS; PLANT genomes; PLANT population genetics; PLANT phylogeny; DNA; SILENE (Genus); PLANT evolution
- Publication
Plant Systematics & Evolution, 2007, Vol 268, Issue 1-4, p235
- ISSN
0378-2697
- Publication type
Article
- DOI
10.1007/s00606-007-0582-6