Action spectra between 350 and 500 nm for the inhibition of phytochrome-dependent spore germination in the fern Pteris vittata were obtained. Both action spectra obtained before and after red light irradiation have peaks at about 440 nm and 380 nm and shoulders from 440 to 480 nm. These results suggest that the phytochrome system is not involved in the inhibitory process of spore germination induced by short irradiation with blue light.
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Michizo Sugai (1971) studied this question.