Phototropism in a red alga, Griffithsia pacifica

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In the red alga, Griffithsia pacifica, shoot portions of a plant are positively photo-tropic and rhizoids are negatively phototropic. We have studied the phototropic response of rhizoids which elongate by tip growth. For 45 min after the beginning of unilateral illumination a rhizoid grows straight, then phototropic curvature begins and continues rapidly until the rhizoid is growing away from the light. Curvature is 70-80% complete after 3 hr. If the unilateral stimulus is given for a short time (15 min), curvature again begins at 45 min. However, within an additional 30-45 min the rhizoid stops growing away from the light and wanders back towards its original direction of growth. Phototropism is elicited by light of wavelengths from 350 nm to 500 nm; in light of wavelengths above 550 nm, little, if any, response occurs.
日本植物生理学会の論文