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Plant Physiology 62:18-21 (1978)
© 1978 American Society of Plant Biologists

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Articles

Regulation by Fixed Nitrogen of Host-Symbiont Recognition in the Rhizobium-Clover Symbiosis 1

Frank B. Dazzo2 and Winston J. Brill3

Department of Bacteriology and the Center for Studies of Nitrogen Fixation, University of Wisconsin, Madison, Wisconsin 53706

Either NO3– (16 millimolar) or NH4+ (1 millimolar) completely inhibited infection and nodulation of white clover seedlings (Trifoliin repens) inoculated with Rhizobium trifolii. The binding of R. trifolii to root hairs and the immunologically detectable levels of the plant lectin, trifoliin, on the root hair surface had parallel declining slopes as the concentration of either NO3– or NH4+ was increased in the rooting medium. This supports the role of trifoliin in binding R. trifolii to clover root hairs. Agglutination of R. trifolii by trifoliin from seeds was not inhibited by these levels of NO3– or NH4+. The results suggest that these fixed N ions may play important roles in regulating an early recognition process in the Rhizobium-clover symbiosis, namely the accumulation of high numbers of infective R. trifolii cells on clover root hairs.

2 Present address: Department of Microbiology and Public Health, Michigan State University, East Lansing, Michigan 48824.

3 To whom all correspondence should be addressed.

1 This research was supported by the College of Agricultural and Life Sciences, University of Wisconsin, Madison, and by National Science Foundation Grants PCM76-24271 and AER77-00879.




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