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The effects of light, 3-(3,4-dichlorophenyl)-1,1-dimethylurea (DCMU), and ammonium ion on pool sizes of ATP were studied in Lemna paucicostata 6746 (wild type) and a photosynthetic mutant (strain 1073) with abnormal flowering responses. Wild type fronds were capable of endogenous and phenazine methosulfate-catalyzed cyclic photophosphorylation. The endogenous cyclic photophosphorylation was inhibited by DCMU. The mutant fronds showed little endogenous but appreciable rates of phenazine methosulfate-catalyzed cyclic photophosphorylation. Treatment with DCMU during prolonged exposure to light did not result in elevated levels of ATP. Ammonium ion in the medium did not inhibit light-induced increases in pool sizes of ATP. It is concluded that the previously reported effects on flowering of DCMU, the photosynthetic mutation or ammonium ion, were not due to altered pool sizes of ATP.

plant physiology

Effects of Light and 3-(3,4-Dichlorophenyl)-1,1-Dimethylurea on Levels of ATP in <i>Lemna paucicostata</i> 6746 and a Photosynthetic Mutant with Abnormal Flowering Responses

Effects of Light and 3-(3,4-Dichlorophenyl)-1,1-Dimethylurea on Levels of ATP in Lemna paucicostata 6746 and a Photosynthetic Mutant with Abnormal Flowering Responses