Abstract
Abstract Tomato (Lycopersicon esculentum Mill. cv. Grosse Lisse) seedlings were grown with a 12-hr photoperiod starting at 0600 hr. Twelve days after sowing, levels of reduced glutathione were found to vary depending on the time of day. The level was lowest around the middle of the dark period (about 200 nmol·g–1), and highest (about 400 nmol·g–1) around the middle of the light period. Levels of oxidized glutathione were highest when the levels of reduced glutathione were decreasing. The possibility of a link between changes in reduced glutathione and reported diurnal variations in herbicide action is discussed.
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