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Originally published in Science Express on 15 July 2004
Science 30 July 2004:
Vol. 305. no. 5684, pp. 676 - 678
DOI: 10.1126/science.1100671
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Reports
Host-to-Parasite Gene Transfer in Flowering Plants: Phylogenetic Evidence from Malpighiales
Charles C. Davis1* and
Kenneth J. Wurdack2
Horizontal gene transfer (HGT) between sexually unrelated species has recently been documented for higher plants, but mechanistic explanations for HGTs have remained speculative. We show that a parasitic relationship may facilitate HGT between flowering plants. The endophytic parasites Rafflesiaceae are placed in the diverse order Malpighiales. Our multigene phylogenetic analyses of Malpighiales show that mitochrodrial (matR) and nuclear loci (18S ribosomal DNA and PHYC) place Rafflesiaceae in Malpighiales, perhaps near Ochnaceae/Clusiaceae. Mitochondrial nad1B-C, however, groups them within Vitaceae, near their obligate host Tetrastigma. These discordant phylogenetic hypotheses strongly suggest that part of the mitochondrial genome in Rafflesiaceae was acquired via HGT from their hosts.
1 Ecology and Evolutionary Biology, University of Michigan Herbarium, 3600 Varsity Drive, Ann Arbor, MI 48108–2287, USA.
2 Department of Botany and Laboratories of Analytical Biology, Smithsonian Institution, 4210 Silver Hill Road, Suitland, MD 20746, USA.
* To whom correspondence should be addressed. E-mail: chdavis{at}umich.edu.
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