1887

Abstract

The attractant effect of green light and the repellent effect of blue light on were studied. It was found that addition of CN and dicyclohexylcarbodiimide, which block the redox chain and H-ATPase, respectively, increased both the amplitude of light-dependent changes of membrane potential (∆), monitored by the distribution of tetraphenyl-phosphonium, and the sensitivity of the green-light taxis. A direct proportionality between ∆ and the green-light sensitivity was revealed. The sensitivity of the green-light taxis was decreased by glucose, histidine and Na/K gradient, i.e. factors reducing the light-dependent changes of protonic potential. These factors did not affect the blue-light taxis. The uncoupler carbonyl cyanide -chlorophenylhydrazone appears to repel cells. These data are in agreement with the assumption that the green-light taxis is governed by a sensing of protonic potential, whereas the blue-light taxis is mediated by a specific photoreceptor.

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1983-02-01
2021-08-05
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