Oxidative Phosphorylation as a Photomorphogenic Control

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Abstract
The uptake and esterification of inorganic phosphate are quickly activated in lettuce seed by the spectral region which induces germination, namely, red light. Far-red light does not cause such activation; on the contrary, phosphate exchange is frequently depressed by far-red light below the levels of controls kept in the dark. The effect of 1 spectral band is repeatedly reversible by the other. The ability of mitochondria isolated from Avena germinants to esterify ATP can be changed significantly by previous exposure of the plant to red and far-red light. Isolated mitochondria of rat liver respond directly to red and far-red light. The effect of 1 spectral band upon the animal mitochondria can be reversed by the other for at least 2 alternations. The effect of far-red light in potentiating the damage caused by X-radiation to tumor-cell chromosomes can be correlated with a decreased ability of the cells to esterify P32.