Abstract
AbstractA very rapid increase in particulate cytochrome c reductase activity during the very early stages of germination of lettuce is demonstrated. The increase in activity does not parallel water uptake or the increase in cytochrome oxidase activity. The increase is reversible on drying of imbibed seeds and is not inhibited by cyanide. It is concluded that the increase in activity is due to some kind of activation process and not to de novo synthesis of protein. Possible mechanisms of activation were investigated. It was not possible to simulate the activation process in vitro, in the isolated particulate fraction.
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