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Gamete discharge by Bryopsis plumosa (Codiales, Chlorophyta) induced by blue and UV‐A light

Gamete discharge by the coenocytic green alga Bryopsis plumosa (Hudson) C. Agardh is induced by light. The mature male gametangia consist of a mass of quiescent male gametes and a large central vacuole. Within a few minutes after the onset of irradiation, breakdown of the tonoplast of the central vacuole and initiation of gamete motility occur simultaneously. This is followed by a forced discharge of moving gametes through a hole ruptured at the subapical region of the gametangium. The action spectrum for the light‐induced gamete discharge was determined from a series of fluence‐response curves. This action spectrum, having two major maxima at 370 and 450 nm, indicates the involvement of a blue light/UV‐A‐absorbing photoreceptor previously described as ‘cryptochrome’.