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Proc. Nati. Acad. Sci. USA Vol. 84, pp. 1319-1323, March 1987
 

Summary: Proc. Nati. Acad. Sci. USA
Vol. 84, pp. 1319-1323, March 1987
Genetics
Rhizobium symbiotic genes required for nodulation of legume and
nonlegume hosts
(Parasponia Rhizobium/symbiosis/gene replacement)
DEBORAH J. MARVEL*tt, JOHN G. TORREYt, AND FREDERICK M. AUSUBEL*
*Department of Genetics, Harvard Medical School, and Department of Molecular Biology, Massachusetts General Hospital, Boston, MA 02114;
and tDepartment of Organismal and Evolutionary Biology, Harvard University. Cambridge, MA 02138
Contributed by John G. Torrey, November 3, 1986
ABSTRACT Parasponia, a woody member of the elm
family, is the only nonlegume genus whose members are known
to form an effective nitrogen-fixing symbiosis with Bradyrhi-
zobium or Rhizobium species. The Bradyrhizobium strain
Rp501, isolated from Parasponia nodules, also nodulates the
legumes siratro (Macroptilium atropurpureum) and cowpea
(Vigna unguiculata). To test whether some of the same genes
are involved in the early stages of Igume and nonlegume
nodulation, we generated transposon TnS insertions in the
region of three evolutionarily conserved genes (nodA, nodB,

  

Source: Ausubel, Frederick M. - Department of Genetics, Harvard University

 

Collections: Biology and Medicine