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Spontaneous mutants at a new symbiotic locus in Rhizobium meliloti SU47 are resistant to several phages and are conditionally insensitive to a monoclonal antibody to the bacterial surface, apparently because they are deficient in a wild-type exopolysaccharide. On alfalfa, the mutants do not curl root hairs, but penetrate the epidermis directly, forming nodules that contain no visible infection threads or "bacteroids," have a few bacteria in superficial intercellular spaces only and not within the nodule cells, and fail to fix nitrogen (Fix-). Evidently, infection threads are not essential for cell proliferation and nodule formation, which are here induced by a bacterial signal at a distance and uncoupled from the bacterial differentiation that normally goes on as well.
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
March 1990,
Journal of bacteriology,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
April 1988,
Journal of general microbiology,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
January 1983,
Journal of molecular and applied genetics,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
May 1992,
Journal of bacteriology,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
December 1983,
Journal of bacteriology,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
January 1983,
Acta microbiologica Polonica,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
January 1970,
Acta microbiologica Polonica. Series A: Microbiologia generalis,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
July 1992,
Journal of bacteriology,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
September 1988,
Journal of bacteriology,
T M Finan, and
A M Hirsch, and
J A Leigh, and
E Johansen, and
G A Kuldau, and
S Deegan, and
G C Walker, and
E R Signer
April 1984,
Cell,
