Symbiosis-stimulated chitinase isoenzymes of soybean (Glycine mas (L.) Merr.) |
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Authors: | Xie Z; Staehelin C; Wiemken A; Broughton W; Muller J; Boller T |
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Institution: | 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 |
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Abstract: | 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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