Molecular Biology and Evolution, Vol 8, 709-720, Copyright © 1991 by Society for Molecular Biology and Evolution
R Wolfson, KG Higgins and BB Sears
Evolutionary relationships of four plastid genomes (plastomes) from
different Oenothera species have been assessed by sequence comparisons of
two intergenic regions that separate the ribosomal protein genes rpl16,
rpl14, and rps8. Sequence changes include base substitutions, the
occurrence of a 29-base tandem duplication, and variation in the length of
two poly-A stretches. Additions/deletions in chloroplast DNA may not be
useful for evolutionary comparisons more distant than these, particularly
if the sequences undergo divergence after the initial event, but the length
mutations reported here allow a finer resolution of the phylogeny of the
closely related Oenothera plastomes than would have been possible if only
base substitutions had been considered. Comparisons with the orthogous
sequence from tobacco chloroplast DNA indicate the direction of change at
most of the sites. The results suggest that plastomes I and II are closely
related to each other, as are plastomes III and IV. Replication slippage is
proposed as a mechanism to explain the length mutations.
ORIGINAL ARTICLE
Evidence for replication slippage in the evolution of Oenothera chloroplast DNA
Department of Botany and Plant Pathology, Michigan State University, East Lansing 48824.
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