Apical Growth of Protonemata in Adiantum capillus-veneris IV. Phytochrome-Mediated Induction in Non-Growing Cells

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In non-growing two-celled protonemata of Adiantum capillus-veneris, apical growth was induced most effectively by red light irradiation; half of the samples were induced to grow by 660 nm light of ca. 1.5 J m^<-2> and the maximum number by ca. 70 J m^<-2>. The reciprocity law was valid in this photoinduction. The growth resumption became detectable 6 hr after the light irradiation and reached a plateau within 24 hr irrespective of given fluences. When non-growing samples were irradiated with red light of 4.6 W m^<-2> for 4 sec or shorter, the effect was fully reversed by a subsequent irradiation with far-red light to the far-red light control level. But, when the red light was given for 16 sec or longer, photoreversibility became partial. An intervening dark period of 2 min between red and far-red light did not significantly influence the photoreversibility so that the escape reaction in the dark may not be attributed to the above-mentioned loss of photoreversibility. By means of a local irradiation with a narrow red light beam (10μm in width), the apical cell was found to be photosensitive for the growth induction, but basal cell was not. Photoreceptive site was not localized in any particular region of the apical cell, but was rather dispersed in the entire apical cell.
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