In order to ascertain whether oxidative phosphorylation in plant mitochondria is sensitive to light, coupled durum wheat (Tridicum durum Desf.) mitochondria were irradiated with a low power continuous wave Helium-Neon laser (fluence: 2 Joules/cm 2), with measurements made of certain processes related to ATP production. As a result of irradiation, an increase in the rate of ATP synthesis was found, as continuously monitored via luciferine/luciferase, moreover the mitochondrial ATP and ADP endogenous contents were found to increase and decrease, respectively with a 1:1 stoichiometry, as revealed by HPLC measurements. Consistently, an increase in mitochondrial rate of ΔΨ generation was found as measured by using the fluorescent probe safranine. Thus, this paper gives a first evidence of a novel property of plant mitochondria: the direct light sensitivity of ATP synthesis via oxidative phosphorylation.

Stimulation of ATP synthesis via oxidative phosphorylation in wheat mitochondria irradiated with helium-neon laser

PASTORE, DONATO;
1996-01-01

Abstract

In order to ascertain whether oxidative phosphorylation in plant mitochondria is sensitive to light, coupled durum wheat (Tridicum durum Desf.) mitochondria were irradiated with a low power continuous wave Helium-Neon laser (fluence: 2 Joules/cm 2), with measurements made of certain processes related to ATP production. As a result of irradiation, an increase in the rate of ATP synthesis was found, as continuously monitored via luciferine/luciferase, moreover the mitochondrial ATP and ADP endogenous contents were found to increase and decrease, respectively with a 1:1 stoichiometry, as revealed by HPLC measurements. Consistently, an increase in mitochondrial rate of ΔΨ generation was found as measured by using the fluorescent probe safranine. Thus, this paper gives a first evidence of a novel property of plant mitochondria: the direct light sensitivity of ATP synthesis via oxidative phosphorylation.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11369/204995
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