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Journal of Experimental Botany, Vol 50, 327-333, Copyright © 1999 by Oxford University Press

ARTICLES

Symbiosis-stimulated chitinase isoenzymes of soybean (Glycine mas (L.) Merr.)

Z Xie, C Staehelin, A Wiemken, W Broughton, J Muller and T Boller
Botanisches Institut der Universitat Basel, Hebelstrasse 1, CH-4056 Basel, Switzerland; Laboratoire de Biologie Moléculaire des Plantes Supérieures, Université de Genève, 1, Chemin de l'Impératrice, CH-1292 Chambesy/Geneve, Switzerland; Present address: Institut des Sciences Végétales, CNRS, Avenue de la Terrasse, F-91998 Gif-sur-Yvette Cedex, France; Corresponding author e-mail: muellerjo@ubaclu.unibas.ch

Isoforms of endochitinase in soybean were studied in relation to root symbiosis. Five selected cultivars differing in their nodulation potential were inoculated with two strains of Bradyrhizobium japonicum, the broad host-range Rhizobium sp. NGR234, and with the mycorrhizal fungus Glomus mosseae. Total chitinase activity in nodules was up to 7-fold higher than in uninoculated roots and in mycorrhizal roots. The chitinase activity in nodules varied depending on the strain-cultivar combination. On semi-native polyacrylamide gels, four acidic isoforms were identified. Two isoforms (CH 2 and CH 4) were constitutively present in al analysed tissues. The other two isoforms (CH 1 and CH 3) were strongly induced in nodules and were simulated in mycorrhizal roots as compared to uninoculated roots. The induction of CH 1 varied in nodules depending on the soybean cultivar. This isoform was also stimulated in uninfected roots when they were treated with tri-iodobenzoic acid, rhizobial lipochitooloigosaccharides (Nod factors) and chitotetraose. CH 3 was not affected by these stimuli indicating that this isoform could represent a marker for enzymes induced in later stages of the symbiotic interactions.Key words: (Brady)rhizobium, chitinase isoenzymes, mycorrhiza, (restricted) nodulation, Nod factors
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