The influence of blue light on dark-germinating seeds of Nemophila insignis.

After inhibition of Nemophila insignis seeds by far-red (FR) light, a short exposure to blue (Bl) will not induce germination again but stimulation by red (R), with reversion by FR, can be observed. Germination is inhibited by long exposures to Bl (maxima at 455 and 475 nm). These radiations are absorbed either directly by phytochrome or through intermediary pigments such as flavoproteins.