Journal of Molecular Evolution

, Volume 70, Issue 1, pp 44–56

Evolutionary Rates in Veronica L. (Plantaginaceae): Disentangling the Influence of Life History and Breeding System

Article

Abstract

The evolutionary rate at which DNA sequences evolve is known to differ between different groups of organisms. However, the reasons for these different rates are seldom known. Among plants, the generation-time hypothesis, which states that organisms that reproduce faster also have more DNA substitutions per time, has gained most popularity. We evaluate the generation-time hypothesis using 131 DNA sequences from the plastid trnLF region and the nuclear ribosomal ITS region of the genus Veronica (Plantaginaceae). We also examine the alternative hypothesis that a higher substitution rate is correlated with selfing breeding system. Selfing is associated with annual life history in many organisms and may thus often be the underlying reason for observed correlations of annual life history with other characters. We provide evidence that annual life history is more likely to be the responsible factor for higher substitution rates in Veronica than a selfing breeding system. Nevertheless, the way in which annual life history may influence substitution rate in detail remains unknown, and some possibilities are discussed.

Keywords

Annuals Generation time ITS Molecular clock Rate heterogeneity Substitution rates trnLF Veronica 

Supplementary material

239_2009_9307_MOESM1_ESM.doc (127 kb)
(DOC 127 kb)
239_2009_9307_MOESM2_ESM.doc (34 kb)
(DOC 35 kb)
239_2009_9307_MOESM3_ESM.eps (5.5 mb)
(EPS 5,666 kb)
239_2009_9307_MOESM4_ESM.eps (6.1 mb)
(EPS 6,286 kb)

Copyright information

© Springer Science+Business Media, LLC 2009

Authors and Affiliations

  1. 1.Institute for Evolution and BiodiversityWestfälische Wilhelms-UniversitätMünsterGermany
  2. 2.Institute for Biology and Environmental SciencesCarl von Ossietzky-Universität OldenburgOldenburgGermany

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