Polarotropism and Photomovement of Chloroplasts in the Protonemata of the Ferns Pteris and Adiantum: Evidence for the Possible Lack of Dichroic Phytochrome in Pteris

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The actions of red and blue light in the photomovement of chloroplasts and the polarotropic response were studied in the protonemata of the homosporous ferns Pteris vittata L. and Adiantum capillus-veneris L. In Pteris, polarotropism could be induced with blue light but not with red light, while both colors of light were effective in Adiantum protonemata. The photomovement of chloroplasts in the two species studied by both polarized light and microbeam irradiation, also revealed similar responses to red and blue light as the polarotropism; i.e. both colors of light were effective in Adiantum but only blue light was active in Pteris. The results in Adiantum were consistent with previous results, which led to the conclusion that both phytochrome and a blue light-absorbing pigment are involved in the two responses (Kadota et al. 1982, 1984, Hayami et al. 1986, Yatsuhashi et al. 1985). By contrast, phytochrome is not involved in either polarotropism or chloroplast movement in Pteris. Since the phytochrome system is evidently active in every other photoresponses so far investigated in Pteris as well as in Adiantum, the present study suggests that a phytochrome system specific to polarotropism and to photomovement of chloroplasts is absent in Pteris. Discussions are presented on the possible involvement of two phytochrome populations in a fern gametophyte cell and on the possible lack of dichroic phytochrome in Pteris.
日本植物生理学会の論文