Molecular Biology and Evolution 18:2136-2138 (2001)
© 2001 Society for Molecular Biology and Evolution
Sequence-Repeat Polymorphisms Exhibit the Signature of Recombination in Lodgepole Pine Chloroplast DNA
Department of Forest Sciences, University of British Columbia, Vancouver, British Columbia, Canada;
B.C. Research Inc., Vancouver, British Columbia, Canada
The chloroplast genome is widely used in plant systematic studies (Olmstead and Palmer 1994
), in part because it is slowly evolving and is assumed to be nonrecombining (Clegg 1993
). Microsatellite markers have also been identified within this genome (Powell et al. 1995
; Provan et al. 1996
; Vendramin et al. 1996
; Newton et al. 1999
), and these markers are sufficiently variable for phylogeographic studies within a species (Schaal et al. 1998
; Newton et al. 1999
; Marshall, Newton, and Ritland 2001
). Lack of recombination reduces homoplasy, which in turn increases the precision of phylogenetic inference in such studies.
However, recently there has emerged some evidence of recombination in another organelle, the mitochondrion. Lunt and Hyman (1997)
found end products of mitochondrial genome recombination in the nematode Meloidogyne javanica. Saville, Kohli, and Anderson (1998)
reported a discrepancy in the expected genotypic structure of mitochondrial
Acknowledgements
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