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Journal of Bacteriology, January 2001, p. 785-790, Vol. 183, No. 2
Department of Ecology and Evolutionary
Biology, University of Arizona, Tucson, Arizona 85721
Received 2 February 2000/Accepted 16 October 2000
This study tested for horizontal transfer of plasmids among
Buchnera aphidicola strains associated with
ecologically and phylogenetically related aphid hosts
(Uroleucon species). Phylogenetic congruence of
Buchnera plasmid (trpEG and
leuABC) and chromosomal (dnaN and trpB) genes supports strictly vertical long-term
transmission of plasmids, which persist due to their contributions
to host nutrition rather than capacity for infectious
transfer. Synonymous divergences indicate elevated mutation on plasmids
relative to chromosomal genes.
0021-9193/01/$04.00+0 DOI: 10.1128/JB.183.2.785-790.2001
Copyright © 2001, American Society for Microbiology. All rights reserved.
Vertical Transmission of Biosynthetic Plasmids in
Aphid Endosymbionts (Buchnera)
*
Corresponding author. Present address: JBP Center for
Comparative Molecular Biology and Evolution, The Marine Biological Lab, 7 MBL St., Woods Hole, MA 02543. Phone: (508) 548-3705, ext. 6650. Fax:
(508) 457-4727. E-mail: jwernegreen{at}mbl.edu.
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