<abstract xmlns="http://www.w3.org/1999/xhtml">

Effects of marine aluminum (Al) on phytoplankton are controversial, making it important to elucidate the mechanisms underlying Al effects. This study was aimed at identifying the effects of Al on the growth, chlorophyll a (chl a) content and the antioxidant mechanism of cyanobacteria Synechococcus sp. WH7803. The growth rate increased from 0.33 to 0.52 d-1 in media with the increasing Al concentration from 0.2 (control) to 20 μmol l-1 and almost saturated to 0.44 d-1 at ~ 0.5 μmol Al l-1. The higher growth resulted in the higher biomass in both stationary and decay phases in the conditions of higher Al content. Chl a per cell reached 10.19 μg cell-1 in the exponential phase at 20 μmol Al l-1, approximately 1.6 and 3.1 times higher than those in stationary and decay phases, respectively, and chl a per cell showed a similar pattern as a growth rate when plotted with Al content. Al addition increased the cellular methane dicarboxylic aldehyde (MDA) content in the exponential phase and decreased the superoxide dismutase (SOD) activity in the decay phase. In particular, our results indicated a positive relationship between chl a per cell and the growth rate, suggesting the stimulation of increasing Al on the growth of Synechococcus is related to the enhancement of cellular chl a content.
</abstract>

Effects of marine aluminum (Al) on phytoplankton are controversial, making it important to elucidate the mechanisms underlying Al effects. This study was aimed at identifying the effects of Al on the growth, chlorophyll a (chl a) content and the antioxidant mechanism of cyanobacteria Synechococcus sp. WH7803. The growth rate increased from 0.33 to 0.52 d-1 in media with the increasing Al concentration from 0.2 (control) to 20 μmol l-1 and almost saturated to 0.44 d-1 at ~ 0.5 μmol Al l-1. The higher growth resulted in the higher biomass in both stationary and decay phases in the conditions of higher Al content. Chl a per cell reached 10.19 μg cell-1 in the exponential phase at 20 μmol Al l-1, approximately 1.6 and 3.1 times higher than those in stationary and decay phases, respectively, and chl a per cell showed a similar pattern as a growth rate when plotted with Al content. Al addition increased the cellular methane dicarboxylic aldehyde (MDA) content in the exponential phase and decreased the superoxide dismutase (SOD) activity in the decay phase. In particular, our results indicated a positive relationship between chl a per cell and the growth rate, suggesting the stimulation of increasing Al on the growth of Synechococcus is related to the enhancement of cellular chl a content.

The increasing aluminum content affects the growth, cellular chlorophyll a and oxidation stress of cyanobacteria <italic>Synechococcus</italic> sp. WH7803

CAS Key Laboratory of Tropical Marine Bioresources and Ecology

Guangdong Provincial Key Laboratory of Applied Marine Biology

University of Chinese Academy of Sciences

Oceanological and Hydrobiological Studies

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The increasing aluminum content affects the growth, cellular chlorophyll a and oxidation stress of cyanobacteria  sp. WH7803

Effects of marine aluminum (Al) on phytoplankton are controversial, making it important to elucidate the mechanisms underlying Al effects. This study was aimed...

The increasing aluminum content affects the growth, cellular chlorophyll a and oxidation stress of cyanobacteria Synechococcus sp. WH7803

Published Online: Sep 30, 2015

Page range: 343 - 351

Received: Feb 03, 2015

Accepted: Apr 24, 2015

DOI: https://doi.org/10.1515/ohs-2015-0033

Keywords
Aluminum, Synechococcus, growth, cellular chl a content, oxidative stress

© 2015 Faculty of Oceanography and Geography, University of Gdańsk, Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

The increasing aluminum content affects the growth, cellular chlorophyll a and oxidation stress of cyanobacteria Synechococcus sp. WH7803

Published Online: Sep 30, 2015

Page range: 343 - 351

Received: Feb 03, 2015

Accepted: Apr 24, 2015

DOI: https://doi.org/10.1515/ohs-2015-0033

KeywordsAluminum, Synechococcus, growth, cellular chl a content, oxidative stress

© 2015 Faculty of Oceanography and Geography, University of Gdańsk, Poland

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Keywords
Aluminum, Synechococcus, growth, cellular chl a content, oxidative stress