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Plant mitochondrial DNA evolved rapidly in structure, but slowly in sequence

Plant mitochondrial DNA evolved rapidly in structure, but slowly in sequence We examined the tempo and mode of mitochondrial DNA (mtDNA) evolution in six species of crucifers from two genera,Brassica andRaphanus. The six mtDNAs have undergone numerous internal rearrangements and therefore differ dramatically with respect to the sizes of their subgenomic circular chromosomes. Between 3 and 14 inversions must be postulated to account for the structural differences found between any two species. In contrast, these mtDNAs are extremely similar in primary sequence, differing at only 1–8 out of every 1000 bp. The point mutation rate in these plant mtDNAs is roughly 4 times slower than in land plant chloroplast DNA (cpDNA) and 100 times slower than in animal mtDNA. Conversely, the rate of rearrangements is extraordinarily faster in plant mtDNA than in cpDNA and animal mtDNA. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of Molecular Evolution Springer Journals

Plant mitochondrial DNA evolved rapidly in structure, but slowly in sequence

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References (48)

Publisher
Springer Journals
Copyright
Copyright © 1988 by Springer-Verlag New York Inc.
Subject
Life Sciences; Evolutionary Biology; Microbiology; Plant Sciences; Plant Genetics and Genomics; Animal Genetics and Genomics; Cell Biology
ISSN
0022-2844
eISSN
1432-1432
DOI
10.1007/BF02143500
Publisher site
See Article on Publisher Site

Abstract

We examined the tempo and mode of mitochondrial DNA (mtDNA) evolution in six species of crucifers from two genera,Brassica andRaphanus. The six mtDNAs have undergone numerous internal rearrangements and therefore differ dramatically with respect to the sizes of their subgenomic circular chromosomes. Between 3 and 14 inversions must be postulated to account for the structural differences found between any two species. In contrast, these mtDNAs are extremely similar in primary sequence, differing at only 1–8 out of every 1000 bp. The point mutation rate in these plant mtDNAs is roughly 4 times slower than in land plant chloroplast DNA (cpDNA) and 100 times slower than in animal mtDNA. Conversely, the rate of rearrangements is extraordinarily faster in plant mtDNA than in cpDNA and animal mtDNA.

Journal

Journal of Molecular EvolutionSpringer Journals

Published: Aug 2, 2005

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