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Position: Home > Articles > EFFECTS OF CD~(2+) STRESS ON THE GROWTH AND PHOTOCHEMICAL ACTIVITY OF PORPHYRIDIUM PURPUREUM Acta Hydrobiologica Sinica 2018,42 (5) 1037-1042

Cd~(2+)对紫球藻生长及光化学活性的影响

作  者:
张仁璇;姜思;佟少明
单  位:
辽宁师范大学生命科学学院辽宁省植物生物工程重点实验室
关键词:
镉离子;紫球藻;生长;光化学活性
摘  要:
以紫球藻(Porphyridium purpureum)为供试材料,研究了5个不同浓度的Cd~(2+)对紫球藻的细胞密度、叶绿素a含量、藻红蛋白含量及ATP含量的影响,以及对紫球藻的最大光量子产额(Fv/Fm)、实际光量子产额(YII)、相对电子传递效率(ETR)及非光化学淬灭(NPQ)的影响,探讨了各荧光参数在不同浓度的Cd~(2+)胁迫下的变化规律。研究结果表明,在Cd~(2+)胁迫的6d内,紫球藻的生长速度显著下降,且Cd~(2+)的浓度越高,生长速度下降越快;Cd~(2+)胁迫显著的减少叶绿素a、藻红蛋白及ATP含量,且浓度越高,减少的幅度越大;在Cd~(2+)浓度低于200μmol/L时,紫球藻的叶绿素荧光参数Fv/Fm、YII及ETR呈现先下降后上升的趋势,而且随着胁迫时间的延长,下降幅度逐步增大;NPQ在低浓度下(<200μmol/L)呈现显著上升趋势,高浓度下(>500μmol/L)呈现显著下降趋势。因此,水体中浓度超过50μmol/L的Cd~(2+)就会显著影响紫球藻的生长及光化学活性,水生环境中不断累积的Cd~(2+)将会对紫球藻的生态平衡产生影响。
译  名:
EFFECTS OF CD~(2+) STRESS ON THE GROWTH AND PHOTOCHEMICAL ACTIVITY OF PORPHYRIDIUM PURPUREUM
作  者:
ZHANG Ren Xuan;JIANG Si;TONG Shao-Ming;The Key Laboratory of Plant Biotechnology of Liaoning Province, School of Life Science, Liaoning Normal University;
关键词:
Cd2+;;Porphyridium purpureum;;Growth;;Photosynthetic activity
摘  要:
This study investigated the effects of Cd~(2+) on the biomass, chlorophyll a content, phycoerythrin content and ATP content, the maximum quantum yield of PSII(Fv/Fm), the effective photochemical yield of PSII(YII), the relative electron transfer rate(ETR) and non-photochemical fluorescence of quenching(NPQ) of the Porphyridium purpureum.The results showed that the growth rate of P. purpureum decreased significantly by the stress of Cd~(2+) in a dosage-dependent pattern. The content of chlorophyll a, phycoerythrin and ATP decreased significantly by Cd~(2+) stress with a dose-dependent way. The chlorophyll fluorescence parameters(Fv/Fm, YII and ETR) under Cd~(2+) stress were significantly lower than those of the control groups and decreased rapidly with increased Cd~(2+) concentration. NPQ value increased significantly at low Cd~(2+)(<200 μmol/L) and decreased significantly at high Cd~(2+)(>500 μmol/L). Therefore, the gorwth and phtochemical activities of Porphyridium purpureum would be significantly affected by the concentration of the Cd~(2+) above 5 μmol/L and the accumulation of Cd~(2+) would have an impact on the ecological balance of the Porphyridium purpureum in aquatic environment.

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