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The Overwintering Capability of ulva prolifera Spores and Gametes in the Yellow Sea,China

Journal of Ocean university of China 2023年第2期22卷 509-516页

作者： HAN Hongbin ZHAO Sheng SONG Xiaoli WANG Hui North China Sea Ecological Center of the Ministry of Natural Resources Qingdao 266033China Key Laboratory of Ecological Prewarning Protection and Restoration of Bohai SeaMinistry of Natural ResourcesQingdao 266033China

Green tides caused by the bloom of ulva prolifera have affected the Yellow Sea annually since 2007.To explore the intrinsic causes of successive blooms,field investigations and indoor simulation experiments were conducted using micro-propagules of u.prolifera.From January to February 2014,micro-propagules of various green algae,including u.prolifera,ulva flexuosa,and ulva linza,were prevalent in the coastal waters of Rudong,Lianyungang,and Qingdao.However,in March 2014,micro-propagules of u.prolifera were not detected in the coastal waters of Lianyungang and Qingdao.Neither the spores nor gametes of u.prolifera can germinate at temperatures below 5℃.At 2℃and 5℃,u.prolifera spores and gametes could survive for 1-3 months at a light intensity range of 0-30μmol m^(-2)s^(-1)and for less than 1 month if the light intensity exceeded 30μmol m^(-2)s^(-1).By integrating indoor experiments and field investigations,this study found that u.prolifera spores and gametes could overwinter in the Rudong coastal area,which is an important factor for the annual emergence of recurring green tides in the Yellow Sea.

关键词： green tides u.prolifera spores gametes micro-propagules overwinter

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Expression analyses of miRNA up-MIR-843 and its target genes in ulva prolifera

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Acta Oceanologica Sinica 2020年第10期39卷 27-34页

作者： Juanjuan Yang Dachun Yu Songdong Shen Department of Cell Biology School of Biology and Basic MedicalSoochow UniversitySuzhou 215123China

microRNAs(miRNA)families play a critical role in plant growth,development,and responses to abiotic stress.In this study,we characterized up-miR-843 and its targets genes in ulva prolifera responses to nitrogen depravation and heat stress.The data demonstrated that 184 target genes of up-miR-843 could be successfully validated.N deficiency not heat stress stimulus induced increase in abundance of the up-miR-843 while exhibited reverse expression of target genes,including cyclin A3 and cyclin L,which were strictly required for cell cycle progression.In addition,u.prolifera with highly expression of up-miR-843 showed improved biomass,and photosynthesis compared with that under normal growth conditions.Thus,the N deprivation and heat responsive miRNAs might be a possible member mediating the expression of these target genes,which further regulated the growth of u.prolifera.

关键词： cyclins nitrogen deprivation microRNA u.prolifera heat stress

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Effects of light and salinity on carotenoid biosynthesis in ulva prolifera

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Acta Oceanologica Sinica 2020年第10期39卷 50-57页

作者： Yuan He Yuantu Ye Songdong Shen College of Biology and Basic Medical Sciences Soochow UniversitySuzhou 215123China

ulva prolifera is a green alga that plays an important role in green tides.Carotenoid biosynthesis is a basic terpenoid metabolism that is very important for maintaining normal life activities in algae.In this study,we first reported the complete sequences of all genes in the 2-C-methyl-D-erythritol 4-phosphate(MEP)pathway,which is the only carotenoid synthesis pathway in u.prolifera.Then,we compared these genes with those of other species.Additionally,by detecting the carotenoid contents and expression levels of key genes participating in carotenoid biosynthesis in u.prolifera under three different light(1000 lx,5000 lx and 12000 lx)and salinity(12,24 and 40)regimes,we found that carotenoid synthesis could be influenced by light and salinity,such that low light and high salinity could promote the synthesis of carotenoids.The results showed that the expression levels of genes involved in the MEP and the downstream pathway could affect the biosynthesis of carotenoids at the molecular level.This study contributes to a better understanding of the roles of genes participating in carotenoid biosynthesis in u.prolifera and the environmental regulation of these genes.

关键词： u.prolifera carotenoid MEP pathway light salinity

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我国如东海区紫菜养殖筏架绿藻种类分子检测及季节性变化

我国如东海区紫菜养殖筏架绿藻种类分子检测及季节性变化

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中国藻类学会第八次会员大会暨第十六次学术讨论会

作者：韩渭陈丽平张建恒田晓玲华梁霍元子于克峰马家海何培民上海海洋大学水产与生命学院

本文主要利用ITS及5S rDNA间隔序列追踪了2010-2011年度南通如东紫菜筏架固着绿藻种类构成季节性变化,并针对紫菜筏架固着生长绿藻进行溯源分析。结果发现,如东紫菜栽培筏架固着绿藻种类主要为ulva.sp、u.compressa、u.prolifera和u.li... 详细信息

本文主要利用ITS及5S rDNA间隔序列追踪了2010-2011年度南通如东紫菜筏架固着绿藻种类构成季节性变化,并针对紫菜筏架固着生长绿藻进行溯源分析。结果发现,如东紫菜栽培筏架固着绿藻种类主要为ulva.sp、u.compressa、u.prolifera和u.linza。对2010年11月份、2011年1月份、2011年3月份和2011年4月份在如东海域紫菜养殖筏架采集生长绿藻固着样品进行漂浮绿潮藻浒苔ITS序列及5S rDNA间隔序列分子检测,通过构建系统发生树,仅发现3月份的绿藻样品中存在与2008年黄海大规模绿潮爆发优势种ITS序列及5S rDNA间隔序列分子100%完全一致的浒苔（u.prolifera）种类;而2011年4月份如东海区早期漂浮绿潮藻样品分别与紫菜养殖筏架的u.compressa和ulva.sp各聚为一支,ITS序列及5S rDNA间隔序列相似性为100%。该研究为进一步阐明我国黄海绿潮溯源及漂浮源头提供了参考。

关键词：绿潮分子检测紫菜养殖筏架 u.prolifera ITS 5S

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