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褐藻アカモクの初期生長に及ぼす日長，照度，水温の影響 Effects of Photoperiod, Light Intensity and Water Temperature on the Early Development of Sargassum horneri (Phaeophyta) 40371968 Yoshida, Goro 吉田, 吾郎 ヨシダ, ゴロウ Yoshida 吉田 ヨシダ Goro 吾郎 ゴロウ 40371950 Arima, Satoshi 有馬, 郷司 アリマ, サトシ Arima 有馬 アリマ Satoshi 郷司 サトシ 30416028 Uchida, Takuji 内田, 卓志 ウチダ, タクジ Uchida 内田 ウチダ Takuji 卓志 タクジ metadata only access Sargassum horneri; early development; photoperiod; light intensity; stem elongation The early development of Sargassum horneri was observed under laboratory culture, in relation to several environmental factors: photoperiod, light intensity and water temperature. Between the five photoperiods (8 hL-16 hD to 16 hL-8 hD in 2 hr steps), germling growth on the basis of total leaf length was promoted with increasing daylength from 8 hL to 14 hL, however no significant difference was observed between 14 hL and 16 hL. Stem differentiation and elongation was fastest in the 12 hL-12 hD regime and delayed under longer or shorter photoperiods. Transferring young thalli to other photoperiod regimes in the course of culture also indicated that 12 hL-12 hD highly promoted stem elongation. Germling growth was proportional to light intensities from 700 lx to 4000 lx and heavily inhibited at 700 lx. All water temperatures tested in the present study (from 15 to 25°C) appear favorable for germling growth of S. horneri. The favored conditions for germling development obtained in the present study agree with field observations reported so far; young thalli grow in the summer (long daylength), and rapid stem elongation occurs after the autumnal equinox. This suggests that photo- period and light intensity are important factors for the growth of early life stages of S. horneri. 南西海区水産研究所 Nansei National Fisheries Research Instituite 1995-03-20 jpn departmental bulletin paper https://fra.repo.nii.ac.jp/records/2003203 nnf_k_28_21 https://agriknowledge.affrc.go.jp/RN/2010510441 日本農学文献記事索引(agriknowledge) AN00181988 0388-841X 南西海区水産研究所研究報告 Bulletin of Nansei National Fisheries Research Instituite 28 12 21 32