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Plant and Cell Physiology, 1986, Vol. 27, No. 8 1571-1577
© 1986

Article

Blue Light-Induced Phototropic Response and the Intracellular Photoreceptive Site in Adiantum Protonemata

Jun Hayami, Akeo Kadota and Masamitsu Wada

Department of Biology, Faculty of Science, Tokyo Metropolitan University Fukazawa 2-1-1, Selagaya-ku, Tokyo 158, Japan

Blue light-induced phototropism in Adiantum protonemata was investigated with microbeam irradiation. Brief irradiation with blue light effectively induced a phototropic response when it was applied to a half-side of the apical 200d µm region of a protonema. The phototropic response was partly reversed by the subsequent far-red light irradiation but the full reversal of the response was not observed even when the fluence of far-red light was increased. In the far-red reversible part of the response, blue/far-red photoreversibility was repeatedly observed. Thus, both phytochrome and a blue light-absorbing pigment (other than phytochrome) seem to be involved in the blue light-induced phototropic response in Adiantum protonemata. Furthermore, detailed studies of the far-red light effect on the fluence-response curve for blue lightinduced phototropism revealed that the concomitant mediation by the two receptors was limited to the response in the relatively higher fluence range of blue light and that the blue light-absorbing pigment alone was responsible in the lower fluence range. In the higher fluence range, the response mediated by the blue light-absorbing pigment became saturated and the phytochrome response became evident, indicating a difference in the sensitivities of the two receptor pigments to blue light.

When various regions of half-sides of protonemata were irradiated with a blue microbeam of 10 µm width, irradiation at the apical 5–25 µm region was most effective both for phytochrome- and blue light-absorbing pigment-mediated response, indicating that the site of blue light perception is almost identical for each response.

(Received July 14, 1986; Accepted September 26, 1986)
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