We studied the effects of chitooligosaccharides (ChOS) with a mol wt of 5 kD, the degree of acetylation of 65%, and the concentrations from 0.01 to 100 mg/l on the content of hydrogen peroxide in incubation medium and the activity of anionic peroxidase (pI ∼ 3.5) in the segments of wheat (Triticum aestivum) coleoptiles. H2O2 production and peroxidase activity were found to be dependent on the ChOS concentration. After 3 h of incubation, the highest H2O2 level in medium was observed at 0.01 mg/l ChOS, whereas after 6h, at 1 mg/l. After 3 h of incubation, ChOS suppressed peroxidase activity. After 6 h of incubation, high ChOS concentrations enhanced peroxidase activity. IAA favored H2O2 accumulation in medium and suppressed anionic peroxidase. The involvement of ChOS in the control of the level of reactive oxygen species and anionic peroxidase activity in plant cells is suggested.
Russian Journal of Plant Physiology – Springer Journals
Published: Apr 7, 2005
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