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Acknowledgments
We thank C. Burch (University of North Carolina, Chapel Hill) for PCR primers; J. Huelsenbeck and P. Andolfatto for insights into the phylogenetic and LD analyses, respectively; and P. Chisholm (Massachusetts Institute of Technology, Cambridge, MA) and D. Hartl (Harvard University) for laboratory space and reagents. This work was supported by a National Institutes of Health (NIH) Genetics Training Grant (to O.K.S.), NIH National Research Service Award GM207636 (to D.M.W.), a David Belkin Memorial Scholarship (to K.M.W.), National Science Foundation (NSF) Postdoctoral Fellowship DBI0400834 (to K.J.O.), and NSF Grant DEB0129089 (to P.E.T.).
Notes
Author contributions: O.K.S., D.M.W., K.J.O., C.U.R., P.E.T., and L.C. designed research; O.K.S., D.M.W., K.M.W., K.J.O., and C.U.R. performed research; O.K.S. and D.M.W. analyzed data; and O.K.S., D.M.W., P.E.T., and L.C. wrote the paper.
Conflict of interest statement: No conflicts declared.
This paper was submitted directly (Track II) to the PNAS office.
Abbreviations: LD, linkage disequilibrium; Pp, Pseudomonas syringae pathovar phaseolicola.
Data deposition: The sequences reported in this paper have been deposited in the GenBank database (accession nos. DQ273591-DQ273662).