RED AND FAR-RED ACTION ON OXIDATIVE PHOSPHORYLATION

Journal Article · Fri Apr 01 00:00:00 EST 1960 · Radiation Research

DOI:https://doi.org/10.2307/3571041· OSTI ID:4194423

Gordon, S A; Surrey, K

The rate of oxidative phosphorylation by isolated mitochondria was found to be affected by red (650 m mu ) and far-red (725 m mu ) light. Esterification of adenosine diphosphate to adenosine tripliosphate by rat liver mitochondria is decreased by concomitant or prior irradiation with far-red and increased by red light. The effect of far-red is reversible by red in an alternating sequence. An analogous sensitivity was not found when isolated mitochondria of the Avena seedling were irradiated. However, irradiation of the intact seedling significantly affected the phosphorylative capacity of the mitochondria subsequently isolated. Whether enhancement or inhibition of activity took place depended on the time at which the seedlings were irradiated in the post germinative period. There is apparently no direct correlation between radiationinduced changes in phosphorylative rate and either mitochondrial protein or volume. Impairment of ATP generation is suggested as the biochemical basis for the far-red potentiation of x-ray-induced chromatid aberrations. The photosensitivity of this phosphorylation also suggests its consideration as a metabolic determinart of the photomorphogeneses controlled by red and far-red light. (auth)

• Research Organization: Argonne National Lab., Lemont, Ill.
• Sponsoring Organization: USDOE
• NSA Number: NSA-14-012497
• OSTI ID: 4194423
• Journal Information: Radiation Research, Vol. Vol: 12; Other Information: Orig. Receipt Date: 31-DEC-60
• Country of Publication: Country unknown/Code not available
• Language: English

Related Subjects

BIOLOGY AND MEDICINE
ADENINE
ATP
BIOCHEMISTRY
CHEMICAL REACTIONS
CHROMOSOMES
ENZYMES
INFRARED RADIATION
IRRADIATION
LIVER
METABOLISM
MITOCHONDRIA
MUTATIONS
NUCLEIC ACIDS
ORGANIC PHOSPHORUS COMPOUNDS
OXIDATION
PLANTS
PROTEINS
RADIATION CHEMISTRY
RADIATION EFFECTS
RADIOSENSITIVITY
RATS
REACTION KINETICS
SEEDS
TISSUES
VARIATIONS
X RADIATION