김屬植物(Genus Porphyra)의 生長·成熟에 미치는 海洋深層水의 影響
Effects of deep sea water on the growth and maturation of poraphyra(Rhodophyta, Bangiales)
김속식물 심층수 수산과학;
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The objective of the present study was carried out to clarify the effects of deep sea water on the growth and maturation of Porphyra (Rhodophyta, Bangiales). Foliose thalli for indoor culture were collected from Jugwang (P. yezoensis), Yeongok (P. okamurae)in Gangwon Prefecture, Tongyoung (P. suborbiculata f. latifolia) and Jijok in Namhae (P. yezoensis f. narawaensis)in Gyongnam Prefecture respectively. Monospores were cultured at five temperatures (5, 10, 15, 20 and 25℃) with a photon irradiance of 80 μmdm^(-2)s^(-1) under photoperiods of 14L:10D and 10L:14D in surface, deep and mixed seawater in respectively. All culture experiments were carried out under illumination by cool white fluorescent lamps in incubators with a thermometer and a timer. Photon irradiance was measured by LI-250 photometer. Growth was determined from measurements of blade length and width. Modified Grund medium was used in all cultures and was renewed weekly. The fast growth of foliose thalli were observed in P. suborbiculata f. latifolia cultured at deep seawater under 15℃ and 10L:14D. In four species, the optimum growth occurred at 10 and 15℃ under deep and mixed seawater and short day-length. In general, monospores from the cultured thalli were liberated within three weeks after incubation under 10-25℃ and both photoperiods. From the result of this study, deep seawater is considered that the natural species of the genus Porphyra from Korea can be useful for the development as the new cultivars.
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