Abstract
Wolffia arrhiza (L.) Wimm. was cultivated under mixotrophic conditions. The influence of continuous light and light-dark cycles (LD = 10: 14), respectively, on the nitrate reductase activity and the levels of soluble protein and nitrate was investigated. Plants in continuous light displayed oscillations in nitrate reductase activity, indicating that an ultradian rhythm may be present. Plants grown in light-dark cycles show higher levels of nitrate reductase activity and soluble protein in comparison with plants, which were cultivated under continuous light conditions. Moreover, the highest activity was found early or near the middle in the light span of a light-dark cycle, but the lowest one was near the end of the light period; in darkness the level of enzyme activity increases again. A correlation with the oscillations of soluble protein or nitrate with those of nitrate reductase was not obvious.
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