Early development of germlings of <Emphasis Type="Italic">Sargassum thunbergii</Emphasis> (Fucales,Phaeophyta) under laboratory conditions |
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Authors: | Ziguo Zhao Fengjuan Zhao Jianting Yao Jingmei Lu Jr" target="_blank">Put O AngJr Delin Duan |
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Institution: | (1) School of Life Sciences, Northeast Normal University, Changchun, 130024, China;(2) Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China;(3) The Chinese University of Hong Kong, Shantin, N. T., Hong Kong SAR, China |
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Abstract: | Morphology and culture studies on germlings of Sargassum thunbergii (Mertens et Roth) Kuntze were carried out under controlled laboratory conditions. Growth characteristics of these germlings
grown under different temperatures (from 10 to 25°C), irradiances (from 9 to 88 μmol photons m−2 s−1), and under blue and white light conditions are described. The development of embryonic germlings follows the classic “8
nuclei 1 egg” type described for Sargassaceae. Fertilized eggs spent 5–6 h developing into multicellular germlings with abundant
rhizoids after fertilization. Under conditions of 20°C, 44 μmol photons m−2 s−1 and photoperiod of 12 h, young germlings with one or two leaflets reached 2–3 mm in length after 8 weeks. Temperature variations
(10, 15, 20, 25°C) under 88 μmol photons m−2 s−1 significantly influenced the growth rate within the first week, although this effect became less obvious after 8 weeks, especially
at 15 and 20°C. Variation in germling growth was highly significant under different irradiances (9, 18, 44, 88 μmol photons
m−2 s−1) at 25°C. Low temperature (10°C) reduced germling growth. Growth of germlings cultured under blue light was lower than in
white light. Optimal growth of these germlings occurred at 25°C and 44 μmol photons m−2 s−1. |
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Keywords: | " target="_blank"> Sargassum thunbergii Germling Growth and development Temperature Irradiance |
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