Impact of low pH/high pCO₂ on the physiological response and exopolysaccharide content in cyanobacteria Trichodesmium erythraeum

Wu, Shijie1; Yu, Kaiqiang1,2; Wang, Fuwen3,4; Mi, Tiezhu3,4; Zhen, Yu3,4

2024-09-01

10.1007/s10452-024-10137-y

AQUATIC ECOLOGY   影响因子和分区

1386-2588

1573-5125

The acidification of the ocean caused by the diffusion of anthropogenic carbon dioxide (CO2) into seawater has been believed to threaten the stability of the marine ecosystem. As one of the major contributors to the primary production in oligotrophic oceans, the response of Trichodesmium to the acidification of the ocean has attracted a lot of attention. Therefore, in this study, we applied physiological and biochemical methods to identify the influences of high pCO(2) and low pH conditions on the growth of T. erythraeum. Our results showed that the low pH during the acidification of the ocean was the main factor inhibiting the growth of T. erythraeum. In addition, low pH caused oxidative stress to T. erythraeum, as evidenced by the increase of the reactive oxygen species and antioxidant enzyme's activities. The activity of carbonic anhydrase (CA) enzyme is dually regulated by pCO(2) and pH, and T. erythraeum can adapt to different levels of pCO(2) and pH in seawater by flexibly adjusting CA enzyme activity. We also discovered that the stimulatory effect of high pCO(2) on the exopolysaccharide (EPS) content of T. erythraeum outweighed the inhibitory effect of low pH during the process of ocean acidification. In conclusion, this study systematically revealed the effects of high pCO(2) and low pH caused by the acidification of the ocean on the growth and EPS of T. erythraeum. These results provide new insights into the response mechanisms of T. erythraeum in the acidified ocean under future climate conditions.

Trichodesmium erythraeum Ocean acidification Growth pH CO2

SCI

英语

其他

The National Natural Science Foundation of China["42367019","41976133"] ; Natural Science Foundation of Ningxia Province[2022AAC03293]

Environmental Sciences & Ecology ; Marine & Freshwater Biology

Ecology ; Limnology ; Marine & Freshwater Biology

WOS:001314861300001

SPRINGER

Web of Science

1.Ningxia Normal Univ, Coll Resources Environm & Life Sci, Guyuan 756000, Peoples R China
2.Southern Univ Sci & Technol, Coll Engn, Sch Environm Sci & Engn, Shenzhen 518000, Peoples R China
3.Qingdao Marine Sci & Technol Ctr, Lab Marine Ecol & Environm Sci, Qingdao 266237, Peoples R China
4.Ocean Univ China, Coll Environm Sci & Engn, Key Lab Marine Environm & Ecol, Minist Educ, Qingdao 266100, Peoples R China

Wu, Shijie,Yu, Kaiqiang,Wang, Fuwen,et al. Impact of low pH/high pCO₂ on the physiological response and exopolysaccharide content in cyanobacteria Trichodesmium erythraeum[J]. AQUATIC ECOLOGY,2024.

Wu, Shijie,Yu, Kaiqiang,Wang, Fuwen,Mi, Tiezhu,&Zhen, Yu.(2024).Impact of low pH/high pCO₂ on the physiological response and exopolysaccharide content in cyanobacteria Trichodesmium erythraeum.AQUATIC ECOLOGY.

Wu, Shijie,et al."Impact of low pH/high pCO₂ on the physiological response and exopolysaccharide content in cyanobacteria Trichodesmium erythraeum".AQUATIC ECOLOGY (2024).