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Role of plant defence in alfalfa during symbiosis

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Abstract

During effective symbiosis, rhizobia colonize their hosts, and avoid plant defence mechanisms. To determine whether the host defence responses can be elicited by the symbiotic bacteria, specific markers involved in incompatible pathogenic interactions are required. The available markers of alfalfa defence mechanisms are described and their use in the study of the symbiotic interaction discussed. As defence-related gene expression in roots is not always related to defence mechanisms, other model systems have been established allowing confirmation of an important role of bacterial surface components in alfalfa-Rhizobium meliloti interactions. Nod factors at high concentrations have been shown to elicit defence-like responses in Medicago cell suspensions and roots. Elicitation of defence mechanisms by high levels of Nod factors in Rhizobium-infected roots may be a part of the mechanism by which nodulation is feed-back regulated.

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Authors
  1. D. Buffard
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  2. R. Esnault
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  3. Á. Kondorosi
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The authors are with the Institut des Sciences Végétales, CNRS, F-91198 Gif-sur-Yvette cédex, France.

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Buffard, D., Esnault, R. & Kondorosi, Á. Role of plant defence in alfalfa during symbiosis. World Journal of Microbiology & Biotechnology 12, 175–188 (1996). https://doi.org/10.1007/BF00364682

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