Lignin biosynthetic enzymes like phenylalanine ammonia-lyase (PAL, ɥ mol cinamic acid min-1 mg-1
protein) and Coniferyl alchohol dehydrgenase (CAD, Change in optical density min-1 mg-1 protein)
activities in rice under control and 8 d after submergence. C: control, S: Submergence for 8 d.