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Chitosan causes auxin accumulation in roots. This is shown by lack of auxin transport in the vascular system (no DR5 expression). This auxin accumulation represses wox5, which controls activity of the quiescent center and in turn root polar growth. As a result, root stops elongating and root apex thickens. ROS and phenolic accumulation are associated with programmed cell death and stress-hormone (JA, SA) accumulation.
