Inhibitor effects on photosynthesis,respiration and active ion transport inHydrodictyon africanum |
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Authors: | J A Raven |
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Institution: | (1) Botany School, Downing Street, Cambridge, England;(2) Present address: Department of Biological Sciences, The University, DDI 4MN Dundee, Scotland |
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Abstract: | Summary The effects of various inhibitors on photosynthesis, respiration, and active influx of K and Cl in light and dark inHydrodictyon africanum is reported. The inhibitors used were arsenate (uncouples electron-transport phosphorylations), dicyclohexylcarbodiimide (energy-transfer inhibitor in electron-transport phosphorylation), quinacrine (uncouples photophosphorylation and inhibits oxidative phosphorylation), and ethionine (traps adenylates as S-adenosyl ethionine). The action of these inhibitors, and of those previously used onHydrodictyon africanum, suggests that K influx requires ATP, while Cl influx requires some earlier manifestation of the ATP synthesizing process. Possible reasons for the greater sensitivity of K influx than of CO2 fixation to treatments which interfere with photophosphorylation are discussed. |
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