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A new record species of epiphytic marine green algae,Entocladia leptochaete(Chaetophoraceae,Chlorophyta) with its primary experimental biology from China

A new record species of epiphytic marine green algae,Entocla...

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： Yunyan Deng~(1,2) Xiaorong Tang~3 Lanping Ding~(1**) and Shaoxing Lian~1 (1.Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China 2.Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3.Marine Genetics and Breeding Laboratory,Ocean University of China,Qingdao 266003,China)

Entocladia leptochaete,a new record species in Chaetophoraceae(Chlorophyta), was observed during our recent laboratory culture of marine benthic green alga, Chaetomorpha *** mainly morphological characteristics of the species are as follows:Thallus is composed of microscopic,prostrate,uniseriate branched filaments. Elongated filaments with some short lateral branches consolidate centrally into *** branches in the external frond are rectangular to slightly swollen and sometimes irregular or distorted at the *** at external frond is rounded or irregular in shape,7-14(-17)μm diameter,14-33μm long,3-5 times as long as *** of cells have 2-4(-6) pyrenoids, occasionally single with diameter of pyrenoids ranging from 2.5μm to 5μ*** parietal chloroplasts are slightly lobed. The first report of this species in China will bridge its distributional range from Europe to *** morphologies,taxonomy and distribution were introduced and discussed in *** culture experiments at different temperatures and light intensities were also carried *** results suggested that the species could adapt well to extensively aquicolous environment.

关键词： China Entocladia leptochaete morphology and taxonomy new record experimental biology

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A Strategy for the Proliferation of Ulva prolifera,Main Causative Species of Green Tides,with Formation of Sporangia by Fragmentation

A Strategy for the Proliferation of Ulva prolifera,Main Caus...

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： Shan Gao~a,Xiaoyuan Chen~a,Qianqian Yi~a,Guangce Wang~(b,1), Guanghua Pan~a,Apeng Lin~(b,c) and Guang Peng~b a College of Marine Science and Engineering,Tianjin University of Science and Technology,Tianjin 300457,China b Institute of Oceanology,Chinese Academy of Sciences (IOCAS),Qingdao 266071,China c Graduate School,Chinese Academy of Sciences,Beijing 100039,China

Ulva prolifera,a common green seaweed,is one of the causative species of green tides that occurred frequently along the shores of Qingdao in 2008 and had detrimental effects on the preparation for the 2008 Beijing Olympic Games sailing competition,since more than 30%of the area of the Games was *** view of the rapid accumulation of the vast biomass of floating *** in green tides,we investigated the formation of sporangia in disks of different diameters excised from U. prolifera,changes of the photosynthetic properties of cells during sporangia formation, and development of *** results suggested that the disks less than 1.00 mm in diameter were optimal for the formation of sporangia,but there was a small amount of spore release in these *** highest percentage of area of spore release occurred in 2.50 mm diameter *** contrast,sporangia were formed only at the cut edges of larger disks(3.00 mm,3.50 mm and 4.00 mm diameter).Additionally,the majority of spores liberated from the disks appeared vigorous and developed successfully into new *** results implied that fragments of the appropriate size from the *** thalli broken by a variety of factors via producing spores gave rise to the rapid proliferation of the seaweed under field conditions,which may be one of the most important factors to the rapid accumulation of the vast biomass of *** in green tides occurred in Qingdao,2008.

关键词： Ulva prolifera Rapid proliferation Sporangia Spore development

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Photosynthetic performances of regenerated protoplasts from disintegrated cells of Bryopsis hypnoides(Chlorophyta)

Photosynthetic performances of regenerated protoplasts from ...

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： Fang Lü~(1,2) and Guangce Wang~(1,*) 1.Key Laboratory of Experimental Marine Biology,Institute of Oceanology,the Chinese Academy of Sciences,Qingdao 266071,China 2.Graduate School,the Chinese Academy of Sciences,Beijing 100039,China

The photosynthetic performances of extruded protoplasts which were incubated in seawater for 1 h,6 h,12 h and 24 h of Bryopsis hypnoides,were studied by chlorophyll concentration determination,photosynthetic oxygen evolution and the pulse-amplitude-modulated measurement. Results showed that for the regenerated sub-protoplasts,the pigment contents,the ratios of photosynthesis rate to respiration rate(P/R),the Maximal PSⅡquantum yield(Fv/Fm) and the effective PSⅡquantum yields(ΦPSⅡ) decreased gradually along with the regeneration progress, indicated that during 24 hours cultivation there was a remarkable reduction in photosystemⅡactivity of those newly formed *** this,we assumed that in the cultivation progress the protoplasts presented different photosynthetic vigor,only some of them can germinate and develop into mature thalli,the above results only reflected the photosynthetic features of the protoplasts at each development stage as a whole,rather than the practical photosynthetic activity of these *** investigation suggested that there was some relationship between the size of regenerated protoplast and its *** present results revealed that the middle sized sub-protoplasts group(diameter of 20-60μm) maintained the largest remain sub-protoplast number through the 24 hours *** the changing tendency of the Fv/Fm andΦPSⅡof the four different sized protoplasts group(<20μm;20-60μm;60-100μm;>100μm) revealed that the protoplasts sized 20-60μm in diameter have highest potential activity of the photosynthetic light energy absorption and conversion after cultivation several hours.

关键词： Bryopsis hypnoides Chlorophyll fluorescence Imaging-PAM Oxygraph Protoplast Photosynthesis

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贵州红枫湖水库浮游植物群落结构及优势种的季节性变化

贵州红枫湖水库浮游植物群落结构及优势种的季节性变化

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者：任启飞李荔王叁梁叶陈椽贵州师范大学生命科学学院

红枫湖水库地处贵州中部乌江主要支流猫跳河的上游,蓄水面积57.2km库容6.01亿m流域面积1551km,为目前贵州高原最大的人工湖泊,是贵阳市的重要水源地。2008年8月～2009年9月笔者对该水库浮游植物进行了为期14个月的定点逐月调查,经鉴定,... 详细信息

红枫湖水库地处贵州中部乌江主要支流猫跳河的上游,蓄水面积57.2km库容6.01亿m流域面积1551km,为目前贵州高原最大的人工湖泊,是贵阳市的重要水源地。2008年8月～2009年9月笔者对该水库浮游植物进行了为期14个月的定点逐月调查,经鉴定,共采集到浮游植物8门72属201种,分别为绿藻门(Chlorophyta)33属109种,占总种类的54.2%;蓝藻门(Cyanophyta)13属40种,占总种类数的19.9%;硅藻门(Bacillariophyta)15属32种,占总种类数的15.9%,金藻门Chrysophyta)1属4种,占总种类数的2.00%;甲藻门(Pyrrophta)4属6种,占总种类数的3.0%;隐藻门(Crytophyta)2属4种,占总种类数的2.0%;裸藻门(Euglenophyta)2属4种,占总种类数的2.0%;黄藻门(Xanthophyta)2属2种,占总种类数的1.0%。由定量实验并对比前人所做的研究分析,表明红枫湖浮游植物的群落组成随水温呈现周期性变化,其优势种的周期变化明显。微囊藻(Microcystis)是红枫湖水库发生水华的主要藻类之一,全年均以微囊藻为主要优势,丰度在0.44～68.64×10cell.L,生物量在0.0836～8.3028mg.L。研究期内蓝藻水华表现出较明显的季节变化,其中,春季以鱼腥藻(Anabaena)为水华优势种,11月～3月束丝藻(Aphanizomenon)大量爆发。6月～10月以微囊藻(Microcystis)为水华优势种类。同时次优势种也呈现出了季节变化:空球藻(Eudorina elegans)和实球藻(Pandorina morum)在秋季和春季为次优势,栅藻(Scenedesmus),卵囊藻(Oocystis)在夏季和冬季为次优势类群。次优势种中的硅藻类群秋冬季以颗粒直链藻(Melosira granulata)、尖针杆藻(Synedra acus)和脆杆藻属(Fragilaria)为主,春夏季以小环藻(Cyclotella)为主。通过对相关环境因子及水化指标的相关统计分析,水温是影响红枫湖水库浮游植物群落时空分布的主要因素,反映了亚热带地区气候四季不分明,而夏秋,冬春明显分割的特征。掌握浮游植物的群落季节性变化对红枫湖蓝藻水华预警有重要的意义。

关键词：红枫湖水库浮游植物种群结构优势种

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The Bryopsis hypnoides plastid genome:Multimeric forms and complete nucleotide sequence

The Bryopsis hypnoides plastid genome:Multimeric forms and c...

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： Fang Lü~(1,3,5),Wei Xü~(2,3,5),Chao Tian~(1,5),Guangce Wang~(1,*),Jiangfeng Niu~1, Guanghua Pan~4,Songnian Hu~3 1.Institute of Oceanology,the Chinese Academy of Sciences(IOCAS),Qingdao 266071,China 2.Beijing Genomics Institute,Chinese Academy of Sciences(BGICAS),Beijing 101300,China 3.Graduate University of the Chinese Academy of Sciences,Beijing 100039,China 4.College of Marine Science and Engineering,Tianjin University of Science and Technology, Tianjin 300457,China

Bryopsis hypnoides Lamouroux is a siphonous green alga,and its extruded protoplasm can aggregate spontaneously in seawater and develop into mature *** chloroplast of *** is the biggest organelle in the cell and shows strong *** better understand this organelle,we sequenced and analyzed the chloroplast genome of this green alga.A total of 111 functional genes, including 69 potential protein-coding genes,5 ribosomal RNA genes,and 37 tRNA genes were *** genome size(153,429 bp),arrangement,and inverted-repeat(IR)-lacking structure of the *** chloroplast DNA(cpDNA) closely resembles that of Chlorella ***,our cytogenomic investigations using pulsed-field gel electrophoresis(PFGE) and southern blotting methods showed that the *** cpDNA had multimeric forms,including monomer,dimer,trimer,tetramer,and even higher multimers,which is similar to the higher order organization observed previously for higher plant *** relative amounts of the four multimeric cpDNA forms were estimated to be about 1,1/2,1/4, and 1/8 based on molecular hybridization *** analyses based on a concatenated alignment of chloroplast protein sequences suggested that *** is located in a lineage with Oltmannsiellopsis viridis and Pseudendoclonium akinetum within the *** of the results suggest that the autonomy of the chloroplasts of *** has little to do with the size and gene content of the cpDNA,and the IR-lacking structure of the chloroplasts indirectly demonstrated that the multimeric molecules might result from the random cleavage and fusion of replication intermediates instead of recombinational events.

关键词： Bryopsis hypnoides plastid genome phylogenetic analyses pulsed-field gel electrophoresis(PFGE) multimeric forms

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Photosynthetic response and its mechanism of Microcystis aeruginosa PCC7806 under low inorganic phosphate

Photosynthetic response and its mechanism of Microcystis aer...

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： WANG Zhicong~(1,2),LI Dunhai~1 (1:State Key Laboratory of Freshwater Ecology and Biotechnology,Institute of Hydrobiology,Chinese Academy of Science,Wuhan 430072) (2:Graduate School of Chinese Academy of Science,Beijing 100049,P.R.China)

Photosynthetic response and its mechanism of Microcystis aeruginosa PCC7806 under different phosphorus nutrient supply was studied so as to provide for the declining process of Microcystis bloom caused by phosphorus nutrient decreasing under field aquatic *** growth curve suggested that the growth of M. aeruginosa PCC7806 was inhibited when P concentration was lower than 0.1 mg/L. The changes of ETR indicated that the photosynthetic activity decreased significantly after treatment with lower than 0.1 mg/L P for 48 hours,while ETR kept elevating and reached to a relative stable value(the average level is 96.2) when supplied with rich phosphorus of 0.6mg/*** the increasing irradiance under low phosphorus level, qP and ETR decreased obviously,and the increase of qN andΦPSⅡwere obviously *** analysis of photosynthetic carbon assimilation showed that the affinity of *** PCC7806 to carbon dioxide was reduced evidently in 0.02mg/L P compared with in 0.6mg/L *** P concentration was reduced from 0.6 mg/L to 0.02 mg/L,the decreasing rate of ETR(74.79%) was significantly greater than that of photosynthetic carbon assimilation(12.21%),which indicated that low P concentration was,but was not the only reason that resulted in the decline of photosynthetic *** low-temperature significantly limited ETR under rich-P condition but had no effect on it when P concentration is insufficient, while ethanol could enhance ETR at low-P level but did not influence it at rich-P level. These two results proved that the decline of thylakoid membrane fluidity caused by P-deficiency was another important reason that results in the decline of photosynthetic efficiency of *** PCC7806.

关键词： Photosynthesis chlorophyll fluorescence Microcystis aeruginosa PCC7806 Phosphorus thylakoid membrane fluidity

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Effects of solar ultraviolet radiation on photochemical efficiency of Chaetoceros curvisetus(Bacillariophyceae)

Effects of solar ultraviolet radiation on photochemical effi...

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者： Wanchun Guan~(a,b),Jianbo Jian~c,Jianyan Wang~a,Ping Li~c,Songhui Lu~(a*) a.College of Life Science South China Normal University,Guangzhou,Guangdong, 510631,China b.School of Life Sciences,Wenzhou Medical College,Wenzhou,Zhejiang,325035, China c.Marine Biology Institute,Shantou University,Shantou,Guangdong,515063,China

To assess the short- and long-term impacts of UV radiation（UVR,280-400 nm） on the red tide alga Chaetoceros curvisetus,we exposed cells to three different radiation treatments - PAB:280-700 nm,PA:320-700 nm,and P:400-700 nm.A significant decrease in the photochemical efficiency(Φ) at high irradiance(100%of incident solar radiation,261.6 Wm) was *** was reduced from 66 to 7%when the cells were placed in 3%solar radiation(4.08 Wm).In long-term experiments（11 days） using batch cultures,cell densities during the first 6 days were relatively constant for treatment P,and decreased slightly under treaments PA and PAB,reflecting a change in the irradiance experienced in the laboratory to that of incident solar ***,specific growth rates increased and UV-induced photoinhibition decreased,indicating acclimation to solar *** were found to exhibit both higher ratios of repair to UV-related damage and increased concentrations of UV-absorbing compounds,whose maximum absorption was found to be at 329 nm. Our data indicate that *** is sensitive to ultraviolet radiation,but was able to acclimate relatively rapidly（ca.6 days） by synthesizing UV-absorbing compounds and by increasing the rates of repair processes of D1 protein in PSⅡ.

关键词： Chaetoceros curvisetus growth photochemical efficiency UVR ΦPSⅡ

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The response and funtion of D1 protein to solar ultraviolet radiation in Arthrospira platensis

The response and funtion of D1 protein to solar ultraviolet ...

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者：吴海燕吴红艳汕头大学海洋生物研究所

Previous studies have shown that solar ultraviolet radiation could lead to the photoinhibition of Arthrospira platensis and the turnover of D1 protein is involved in the repair of the UV-B induced PSⅡ*** this study,cultures of *** 439 were exposed to full spectrum of solar radiation(PAB,280-700nm),solar radiation depleted of UV-B(PA,320-700nm) and solar radiation filtered out of UV-B + UV-A(P,400-700nm) in order to investigate the synergic effects of PAR and UV radiation on the changes of the amount of D1 protein and the role of de novo synthesis of D1 protein during the exposure to solar UV radiation..It was shown that at irradiance level of PAR120 W m,UV-A 27.5 W m and UV-B 0.84 W m,the effective photochemical efficiency(Fv’/Fm’) of *** decreased to 73.7%,40.5%and 35.1%of the initial value under P,PA and PAB treatments *** in the presence of lincomycin,an inhibitor of protein synmesis,Fv’/Fm’ decreased sharply to 7.9%under P treatment,and could not be detected under PA and PAB *** irradiance level of PAR 320 W m,UV-A 73.6 W m,UV-B 2.24 W m led to the inhibition of the photosynthetic activity to a much more extent,Fv’/Fm’ could not be detected regardless of the radiation treatments in the presence of *** oxygen evolution rate was also affected by UV radiation,but to a less extent as compared with the photochemical efficiency both in the absence and presence of *** addition,the relative electron transfer rate(rETR) was significantly decreased under the radiation treatment with UVR, showing an inhibition of 44.6%and 54.8%in PA and PAB treatments compared with that under PAR,while rETR could not be examined when the D1 protein synthesis was *** amount of D1 protein examined by western blot showed that it could be damaged by solar radiation treatments,particularly at high irradiance ***,when the synthesis of D1 protein was inhibited by lincomycin,it showed a much lower content.P t

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海带配子体Ihcf5基因的克隆及在雌、雄配子体中的差异表达分析

海带配子体Ihcf5基因的克隆及在雌、雄配子体中的差异表达分析

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庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者：邹丹燕陆广琴毕燕会周志刚上海海洋大学农业部水产种质资源与利用重点开放实验室上海高校水产养殖学E-研究院

根据海带(Laminaria japonica)雄配子体抑制消减cDNA文库中E04克隆序列及糖海带(***)lhcf5基因的cDNA序列(GenBank登录号:AF226861)设计引物并进行反转录PCR扩增,获得海带雄配子体lhcf5基因的全长cDNA序列(GenBank登录号:EU751620),它长1078 bp,其中5’-非翻译区(UTR)长22 bp,开放阅读框(ORF)长657 bp,3’-UTR长399 bp并具有典型的poly(A)尾巴,且雌、雄配子体lhcf5基因的cDNA序列完全一致。海带配子体lhcf5基因的ORF编码218个氨基酸,与糖海带lhcf5所编码氨基酸序列的相似性高达98%;编码蛋白氨基端的前40个氨基酸组成了跨质体内质网和叶绿体膜信号肽;跨膜酶切后变为含178个氨基酸的成熟蛋白,它的分子量为19.3 kD,等电点为4.86。预测的成熟蛋白LHCF5高级结构存在4个保守性的β-折叠和3个跨类囊体膜的α-螺旋区。利用基因组DNA为模板,锚定PCR扩增产物的序列结果表明海带雌、雄配子体lhcf5基因都存在着一个1134bp的内含子,位于ORF的第62 bp后。实时荧光定量PCR(Q-RT-PCR)结果显示,lhcf5基因在黑暗中接近不转录;雌配子体在40μmol m·s时转录量最高,而雄配子体的最高转录量出现在80μmol m·s的光照强度处;高于最适宜的光照强度,lhcf5基因的转录量会随光照强度增加而降低。相对于同强度的白光来说,短时间(3 d)和长时间(7 d)的红光照射,都会促进这个基因的相对转录水平;蓝光对雌配子体lhcf5基因转录的促进作用不明显,而它对雄配子体lhcf5基因的转录有一定的促进作用。将海带配子体从营养生长转至有利于配子发生的条件下,雌、雄配子体lhcf5基因在第1天的转录量都明显增加;雌配子体在第4天以及第14天显著增加,第6及第10天接近不转录;雄配子体在第8天及第14天增加,第10天也近似不转录;发育阶段其它时间内的转录量都低于营养生长期的。结果表明海带配子体lhcf5的转录受光诱导,其中红光的促进作用最明显;其转录可能因有利于配子体细胞叶绿体结构的完善及物质与能量的积累,而利于细胞分裂与营养生长。

关键词：海带雌配子体雄配子体 lhcf5基因光转录量

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基于CCA的喀斯特水库浮游植物群落动态特征分析——以百花湖水库为例

基于CCA的喀斯特水库浮游植物群落动态特征分析——以百花湖水库...

引用

庆祝中国藻类学会成立30周年暨第十五次学术讨论会

作者：王叁李荔任启飞晏妮陈椽贵州师范大学生命科学学院

喀斯特水库是一类特殊的水体,其浮游植物群落的组成与动态的调节机制与其它水库存在较大的差别。为了解这类水库浮游植物群落的特征,于2008年8月至2009年7月,对位于贵州省境内乌江支流猫跳河中上游梯级开发电站人工水库——百花湖水库... 详细信息

喀斯特水库是一类特殊的水体,其浮游植物群落的组成与动态的调节机制与其它水库存在较大的差别。为了解这类水库浮游植物群落的特征,于2008年8月至2009年7月,对位于贵州省境内乌江支流猫跳河中上游梯级开发电站人工水库——百花湖水库的浮游植物和生态因子进行了一个月两次的调查,共设置4个调查点(大坝、岩脚寨、管理处、泵房)。研究期间,百花湖水库浮游植物丰度与群落结构具有明显季节变化。经显微镜镜检,24次采样共检测到浮游植物81种(属),分属7门。浮游植物主要由蓝藻门、绿藻门和硅藻门组成。蓝藻门藻类有20种(属),占25%,绿藻门藻类有33种(属),占41%,硅藻门藻类有18种(属),占22%。甲藻门、金藻门各4种,裸藻门3种、隐藻门2种。优势种主要为水华束丝藻(***-aquae(L.)Ralfs.)、直链藻(Melosira Ag.)、假鱼腥藻(Pseudanabaena sp.)和齿蚀隐藻(*** Ehr)、卵形隐藻(*** Ehr)小环藻(Cyclotella *** Breb)。浮游植物丰度在282.766—1.606×10cells·L之间变化,峰值出现在2008年9月份,在5月份-7月份波动较大,其它月份各监测点之间区别较小。生物量在67.452—1.362mg·L之间变化,峰值出现在9月份。应用CANOCO4.0软件对浮游植物物种数据和生态因子数据进行了典范对应分析(CCA),并作出物种与生态因子关系的二维排序图。结果表明:水温和透明度是影响百花湖水库浮游植物群落结构的主要生态因子。全部的样品分布在轴1和轴2构成的4个象限内,反映了春、夏、秋、冬四季的季节对应,样品在4个象限的分布并不均匀,说明水库所处的气候四季不分明的特点,冬春季很短,夏秋季较长,但夏秋与冬春有较为明显的分割。浮游植物排序结果可将其分为三组:一组为与温度影密切相关的种类,铜绿微囊藻(*** Kutz.)、水华束丝藻(***-aquae(L.)Ralfs.)等20个种类;二组为与透明度(SD)和溶解氧(OD)相关性较高的种类,颤藻(Oscillatoria *** Gom.)、光滑栅藻(***(Ehrenb.)Chod.)等12个种类;三组则生活在化学耗氧量(COD)和总磷(TP)较高的地区,四角十字藻(*** Morr.)等10个种类。排序揭示了浮游植物物种对于生态环境的需求以及它们在不同资源上的生态分化现象。

关键词：喀斯特水库浮游植物生态因子典范对应分析

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