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PLANT PHYSIOLOGY , Vol 105, Issue 2 585-592, Copyright © 1994 by American Society of Plant Biologists
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PLANT-MICROBE INTERACTIONS |
Alfalfa Enod12 Genes Are Differentially Regulated during Nodule Development by Nod Factors and Rhizobium Invasion
P. Bauer, M. D. Crespi, J. Szecsi, L. A. Allison, M. Schultze, P. Ratet, E. Kondorosi and A. Kondorosi
Institut des Sciences Vegetales, Centre National de la Recherche Scientifique, F-91198 Gif sur Yvette Cedex, France (P.B., M.D.C., J.S., L.A.A., M.S., P.R., E.K., A.K.)
MsEnod12A and MsEnod12B are two early nodulin genes from alfalfa (Medicago
sativa). Differential expression of these genes was demonstrated using a
reverse transcription-polymerase chain reaction approach. MsEnod12A RNA was
detected only in nodules and not in other plant tissues. In contrast,
MsEnod12B transcripts were found in nodules and also at low levels in
roots, flowers, stems, and leaves. MsEnod12B expression was enhanced in the
root early after inoculation with the microsymbiont Rhizobium meliloti and
after treatment with purified Nod factors, whereas MsEnod12A induction was
detected only when developing nodules were visible. In situ hybridization
showed that in nodules, MsEnod12 expression occurred in the infection zone.
In empty Fix nodules the MsEnod12A transcript level was much reduced, and
in spontaneous nodules it was not detectable. These data indicate that
MsEnod12B expression in roots is related to the action of Nod factors,
whereas MsEnod12A expression is associated with the invasion process in
nodules. Therefore, alfalfa possesses different mechanisms regulating
MsEnod12A and MsEnod12B expression.
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