Effects of metabolic inhibitors on salt uptake and organic acid synthesis by leaf tissues in the light and in the dark

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Summary The effect of different antimetabolites, that are known to inhibit, selectively, the production of high energy compounds (ATP), on the rates of salt uptake and organic acid synthesis by 6-day-old barley leaf tissues was studied both in the light and in the dark. Salt uptake and organic acid synthesis were consistently higher in the light than in the dark. Selective inhibition of various energy pools suggests that this light-enhanced salt uptake and organic acid synthesis are caused by an additional source of ATP available from photophosphorylation. Quite often, inhibition in the light was less pronounced even on an absolute scale. This suggests that the ATP supply in the light becomes less limiting, so that the elemination of one source — respiration — has a smaller effect in the light.