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The quinolinecarboxylic acid quinclorac is a new class of highly selective auxin herbicide and used by both, pre and post transplaming and direct-seeded rice.In the present study, different concentrations (0, 0.1, 0.25, 1 g/L) of quinclorac were used in order to investigate the physio-chemical changes in two Oryza sativajaponica cultivars Zhejing 88 and Xiushui 134.