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THE PLANT CELL, Vol 4, Issue 10 1199-1211, Copyright © 1992 by American Society of Plant Biologists

RESEARCH ARTICLES

Rhizobium meliloti Elicits Transient Expression of the Early Nodulin Gene ENOD12 in the Differentiating Root Epidermis of Transgenic Alfalfa

M. Pichon, E. P. Journet, A. Dedieu, F. de Billy, G. Truchet and D. G. Barker
Laboratoire de Biologie Moleculaire des Relations Plantes Microorganismes, INRA-CNRS, BP27, 31326 Castanet-Tolosan Cedex, France

To study the molecular responses of the host legume during early stages of the symbiotic interaction with Rhizobium, we have cloned and characterized the infection-related early nodulin gene MtENOD12 from Medicago truncatula. In situ hybridization experiments have shown that, within the indeterminate Medicago nodule, transcription of the MtENOD12 gene begins in cell layers of meristematic origin that lie ahead of the infection zone, suggesting that these cells are undergoing preparation for bacterial infection. Histochemical analysis of transgenic alfalfa plants that express an MtENOD12 promoter-[beta]-glucuronidase gene fusion has confirmed this result and further revealed that MtENOD12 gene transcription occurs as early as 3 to 6 hr following inoculation with R. meliloti in a zone of differentiating root epidermal cells which lies close to the growing root tip. It is likely that this transient, nodulation (nod) gene-dependent activation of the ENOD12 gene also corresponds to the preparation of the plant for bacterial infection. We anticlpaie that this extremely precocious response to Rhizobium will provide a valuable molecular marker for studying early signal exchange between the two symbiotic organisms.


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ASPB Publications THE PLANT CELL PLANT PHYSIOLOGY
Copyright © 1992 by the American Society of Plant Biologists