Phylogenetic analysis of plastid origins based on secA sequences |
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| Authors: | A C Barbrook P J Lockhart C J Howe |
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| Institution: | (1) Department of Biochemistry and Cambridge Centre for Molecular Recognition, University of Cambridge, Tennis Court Road, Cambridge CB2 1QW, UK e-mail: c.j.howe@bioc.cam.ac.uk, GB;(2) Institute of Molecular Biosciences, Massey University, Palmerston North, New Zealand, NZ |
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| Abstract: | We have generated secA sequence data from a number of photosynthetic prokaryotes and carried out a phylogenetic analysis using secA sequences from prokaryotes, green plants, and red and brown algae. We have studied the substitution patterns that give rise
to the apparent phylogenetic structure. We show that the high AT content of the plastid sequences significantly affects the
amino-acid composition. We also show that most of the apparent evidence for an edge separating red and brown plastids from
green plants within the phylogenetic tree is due to differences in nucleotide composition. The remaining apparent evidence
is likely to be due, at least in part, to differences in the distribution of sites free to vary. We discuss the implications
of this study for hypotheses of plastid origins.
Received: 21 May / 8 September 1998 |
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| Keywords: | Phylogenetic inference Plastid origins Compositional bias Covarion |
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