Circadian Rhythm of Nitrate Reductase (NADH) Activity in Wheat Seedlings Grown in Continuous Light

Abstract

A circadian rhythm of nitrate reductase (NADH) was observed when three cultivars of Triticum aestivum L. were grown in continuous light. The amplitude of the rhythm was greatest when the lamps used emitted both red and blue light. High rhythmic activity in roots occurred only when seedlings were germinated and grown in continuous light. Nitrite reductase was induced with no oscillation.