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(A) Simplified scheme of the phenolic biosynthesis pathway and (B) the time course data of the activities of enzymes involved in phenolic biosynthesis in lettuce subjected to reduced nitrogen supply. The enzymes investigated are shikimate dehydrogenase (SKDH), phenylalanine ammonia-lyase (PAL), 4-coumarate coenzyme A ligase (4CL), and cinnamate 4-hydroxylase (C4L). Data represent are means ± SD (n = 6). * indicates significant difference at P < 0.05 between LN and CK.
