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引用本文:安强,李雪琴,王沙,黄晓龙,蒋韵秋.环境因子对三峡库区铜绿微囊藻(Microcystis aeruginosa)群体形成影响及其形态特征.湖泊科学,2017,29(2):378-388. DOI:10.18307/2017.0214
AN Qiang,LI Xueqin,WANG Sha,HUANG Xiaolong,JIANG Yunqiu.Effects of environmental factors on Microcystis aeruginosa colony formation and morphological characteristics in Three Gorges Reservoir. J. Lake Sci.2017,29(2):378-388. DOI:10.18307/2017.0214
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环境因子对三峡库区铜绿微囊藻(Microcystis aeruginosa)群体形成影响及其形态特征
安强, 李雪琴, 王沙, 黄晓龙, 蒋韵秋
重庆大学三峡库区生态环境教育部重点实验室, 重庆 400045
摘要:
为揭示微囊藻群体形成机理,为有效防治水华暴发提供依据,以三峡库区铜绿微囊藻(Microcystis aeruginosa)为研究对象,研究N、P浓度,Ca2+浓度,光强,温度对铜绿微囊藻生长、胞外多糖(EPS)合成和群体微囊藻形成的影响,并对比分析了单细胞和群体微囊藻的形态特征.研究发现当N≤100 mg/L、P≤5 mg/L时,铜绿微囊藻生物量和EPS合成量随着N、P浓度增加而增加;适宜浓度的Ca2+(65 mg/L)有利于藻生长,EPS产量随着Ca2+浓度增加而降低,过高浓度的Ca2+在刺激微囊藻细胞分泌EPS的同时可能会促进其溶解,Ca2+和EPS均对微囊藻群体形成起桥架粘结作用;光照和温度对EPS合成有一定促进作用,且其促进效果均高于N、P和Ca2+作用,20℃是同时满足微囊藻生长及EPS合成的最有利条件.群体细胞比单细胞周围的胶质鞘更加明显和清晰,多糖胶鞘表面有许多Ca2+晶体,从微观角度可以确定Ca2+在EPS合成及群体形成中起着重要作用.
关键词:  三峡库区  环境因子  铜绿微囊藻  形态特征
DOI:10.18307/2017.0214
分类号:
基金项目:中央高校基金项目(CDJZR14215501)资助.
Effects of environmental factors on Microcystis aeruginosa colony formation and morphological characteristics in Three Gorges Reservoir
AN Qiang, LI Xueqin, WANG Sha, HUANG Xiaolong, JIANG Yunqiu
Key Laboratory of Three Gorges Reservoir Region's Eco-Environment, Ministry of Education, Chongqing University, Chongqing 400045, P. R. China
Abstract:
To reveal Microcystis aeruginosa colony formation mechanism and provide the basis for effectively controlling the algae blooming in the Three Gorges Reservoir region, impacts of N, P concentrations, Ca2+ concentration, light intensity and temperature on the growth, extracellular polysaccharides synthesis and colony formation of the M. aeruginosa were investigated, and the morphological characteristics of single cells and M. aeruginosa groups were compared. The results showed that the biomass of M. aeruginosa and EPS concentration increased with the increasing of N, P concentrations. The optimal Ca2+ concentration for the growth of M. aeruginosa was 65 mg/L, and the EPS content decreased with the increasing of Ca2+ concentration. High Ca2+ concentrations might stimulate the cells to secrete the EPS and simultaneously promote the EPS to be dissolved. Both Ca2+ and EPS took the responsibility for the colony formation of M. aeruginosa as the bridge bond action. Light and temperature played a role on the synthesis of the EPS, which were stronger than the promoting effects of N, P and Ca2+ concentrations. 20℃ was the most favorable temperature conditions for the Microcystis growth and EPS synthesis. The surrounding gelatinous sheath of cells group was more obvious and clearer than the single cell. Many Ca2+ crystals on the sheath surface of polysaccharide gums were observed. Thus, Ca2+ played an important role in EPS synthesis and colony formation.
Key words:  Environmental factors  Microcystis aeruginosa  morphological characteristics  Three Gorges Reservoir region
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