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The environmental adaptability and reproductive properties of invasive green alga codium fragile from the Nan'ao Island,South China Sea

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Acta Oceanologica Sinica 2022年第3期41卷 70-75页

作者： Lanping Ding Xulei Wang Bingxin Huang Weizhou Chen Shanwen Chen College of Life Sciences Tianjin Normal UniversityTianjin 300387China Marine Biology Institute Shantou UniversityShantou 515063China Tianjin Key Laboratory of Animal and Plant Resistance Tianjin 300387China

It has been widely recognized that biological invasion has become one of the greatest threats to the *** fragile is an invasive species which exhibits a variety of attributes like parthenogenesis,winter fragment,and vegetative reproduction;and therefore,it has become a successful invader,colonizing most subtropical *** China’s southeast coastal aquaculture waters,the green algal bloom caused by *** will probably become a serious *** order to understand more details about the species,an experiment focused on its reproductive characteristics was conducted using culture established from a sample collected in the aquaculture raft of the Nan’ao Island in the South China *** results showed that there were two types of gametes resembling aplanospores and zoospores respectively,both of which were able to *** the gametes liberation,a long mucilage tube was formed out of the mouth of the gametangium assisting dispersal of gametes away from the parent *** tube was adapted not only to its surrounding flowing water environment but also to its parent plant’s outer gelatinous *** general,the optimum temperature for gametes release and germination was 15-20℃ and 15℃,respectively,which corresponded to the local offshore marine *** plant was observed to produce vegetative buds under favourable reproductive conditions which were called *** were capable of developing into filamentous *** results will provide some scientific evidences for revealing the biological mechanism of bloom and control strategies of invasive green algae.

关键词： codium fragile gametes propagules mucilage tube temperature environmental adaptation

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Assembly of the Protoplasm of codium fragile (Bryopsidales, Chlorophyta) into New Protoplasts

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Journal of Integrative Plant Biology 2008年第6期50卷 752-760页

作者： Demao Li Fang Lu Guangce Wang Baicheng Zhou Institute of Oceanology the Chinese Academy of Sciences Qingdao 266071 China College of Manne Science and Engineering Tianjin University of Science and Technology Tianjin 300457 China Department of Food Science College of Agriculture Liaocheng University Liaocheng 252059 China Graduate School the Chinese Academy of Sciences Beijing 100039 China

The cell organelles of the coenocytic alga codium fragile （Sur.） Harlot aggregated rapidly and protoplasts were formed when its protoplasm was extruded out in seawater. Continuous observation showed that there were long and gelatinous threads connecting the cell organelles. The threads contracted, and thus the cell organelles aggregated into protoplasmic masses. The enzyme digestion experiments and Coomassie Brilliant Blue and Anthrone stainings showed that the long and gelatinous threads involved in the formation of the protoplasts might include protein and saccharides as structure components. Nile Red staining indicated that the protoplast primary envelope was non-lipid at first, and then lipid materials integrated into its surface gradually. The fluorescent brightener staining indicated that the cell wall did not regenerate in the newly formed protoplasts and they all disintegrated within 72 h after formation. Transmission electron microscopy of the cell wall of wild C. fragile showed electron-dense material embedded in the whole cell wall at regular intervals. The experiments indicated that C. fragile would be a suitable model alga for studying the formation of protoplasts.

关键词： codium fragile protoplasm protoplast cell wall

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Structural Analysis of Peptides of PSⅡ Light-harvesting Complexes in Siphonous Green Algae, codium fragile

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Acta Botanica Sinica 2002年第2期44卷 147-151页

作者：陈敏李爱芬周百成烟台大学生物化学系烟台264005 中国科学院海洋研究所青岛266071

Peptide composition and arrangement of 4 major light-harvesting complexes LHCP 1-3 and LHCP 3′ isolated from siphonous green algae (codium fragile (Sur.) Hariot.) were investigated. LHCP 1 showed five main peptides, 34.4, 31.5, 29.5, 28.2 and 26.5 kD in SDS-PAGE, the 34.4 and 31.5 kD peptides were never found in higher plants. LHCP 3 contained the other four kinds of LHCP 1 peptides except 34.4 kD, while LHCP 3′ consisted of only 28.2 and 26.5 kD peptides. We found that 34.4, 28.2 and 26.5 kD peptides were easy to decompose from LHCP 1 when subjected to SDS-PAGE without pretreatment. They might be located at the exterior of LHCP 1, while the 31.5 and 29.5 kD peptides were at the central part. The 28.2 and 26.5 kD peptides often occurred in CPa, the center complex of PSⅡ. They are possibly the LHCⅡ peptides tightly associated with CCⅡ. According to the results described above, a peptide map of LHCP 1 was sketched.

关键词： light-harvesting complexes peptide arrangement structure codium fragile

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