Photomorphogenesis in Pteris vittata II. Recovery from blue-light-induced inhibition of spore germination

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1. In the fern Pteris vittata, low-energy blue-light-induced inhibition of phytochrome-dependent spore germination and dark recovery from this inhibition were repeatedly observed several times at intervals of 3 days at 26°. The same amount of incident energy of blue light was required for inhibition in each successive treatment. 2. The recovery from blue-light-induced inhibition of germination was markedly accelerated by continuous illumination with red light, and this red light effect was not affected by the presence of CMU. 3. The recovery process was not influenced by a single exposure to red light, but was definitely promoted by brief red irradiations given intermittently, at least 2 times, at equal intervals during the first 8 hr after blue light treatment. The effect of intermittently given red light was annulled when each red exposure was followed by brief far-red irradiation. These facts suggest that phytochrome may be involved in the restoration of the ability of spores to germinate (in response to red light) which had been lost by blue irradiation.
日本植物生理学会の論文