Plant Physiol.
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Flavan-Containing Cells Delimit Frankia-Infected Compartments in Casuarina glauca Nodules1

Laurent Laplaze, Hassen Gherbi, Thierry Frutz, Katharina Pawlowski, Claudine Franche, Jean-Jacques Macheix, Florence Auguy, Didier Bogusz, and Emile Duhoux*

Physiologie Cellulaire et Moléculaire des Arbres, GeneTrop Institut de Recherche pour le Développement, 911 Avenue Agropolis, 34032 Montpellier cedex 1, France (L.L., H.G., T.F., C.F., F.A., D.B., E.D.); Department of Molecular Biology, Agricultural University, Dreijenlaan 3, 6703 HA Wageningen, The Netherlands (K.P.); Biochemie der Pflanze, Albrecht-von-Haller-Institut für Pflanzenwissenschaften, Untere Karspüle 2, 37073 Göttingen, Germany (K.P.); and Laboratoire de Biotechnologie et Physiologie Végétale Appliquée, Université Montpellier 2, Place Eugène Bataillon, 34095 Montpellier cedex 5, France (J.-J.M.)

We investigated the involvement of polyphenols in the Casuarina glauca-Frankia symbiosis. Histological analysis revealed a cell-specific accumulation of phenolics in C. glauca nodule lobes, creating a compartmentation in the cortex. Histochemical and biochemical analyses indicated that these phenolic compounds belong to the flavan class of flavonoids. We show that the same compounds were synthesized in nodules and uninfected roots. However, the amount of each flavan was dramatically increased in nodules compared with uninfected roots. The use of in situ hybridization established that chalcone synthase transcripts accumulate in flavan-containing cells at the apex of the nodule lobe. Our findings are discussed in view of the possible role of flavans in plant-microbe interactions.

1   This research was supported by the Institut de Recherche pour le Développement.
*   Corresponding author; e-mail duhoux{at}mpl.ird.fr; fax 33-4-67-63-82-65.

Plant Physiol. (1999) 121: 113-122
Copyright Clearance Center:   0032-0889/99/121//10
© 1999 American Society of Plant Physiologists






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ASPB Publications PLANT PHYSIOLOGY® THE PLANT CELL
Copyright © 1999 by the American Society of Plant Biologists