Premium
A Rise in ROS and EPS Production: New Insights into the Trichodesmium erythraeum Response to Ocean Acidification
Author(s) -
Wu Shijie,
Mi Tiezhu,
Zhen Yu,
Yu Kaiqiang,
Wang Fuwen,
Yu Zhigang
Publication year - 2021
Publication title -
journal of phycology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.85
H-Index - 127
eISSN - 1529-8817
pISSN - 0022-3646
DOI - 10.1111/jpy.13075
Subject(s) - trichodesmium , biology , diazotroph , reactive oxygen species , nitrogen fixation , ocean acidification , botany , photosynthesis , biochemistry , climate change , ecology , genetics , bacteria
The diazotrophic cyanobacterium Trichodesmium is thought to be a major contributor to the new N in parts of the oligotrophic, subtropical, and tropical oceans. In this study, physiological and biochemical methods and transcriptome sequencing were used to investigate the influences of ocean acidification (OA) on Trichodesmium erythraeum ( T. erythraeum ). We presented evidence that OA caused by CO 2 slowed the growth rate and physiological activity of T. erythraeum . OA led to reduced development of proportion of the vegetative cells into diazocytes which included up‐regulated genes of nitrogen fixation. Reactive oxygen species (ROS) accumulation was increased due to the disruption of photosynthetic electron transport and decrease in antioxidant enzyme activities under acidified conditions. This study showed that OA increased the amounts of (exopolysaccharides) EPS in T. erythraeum , and the key genes of ribose‐5‐phosphate (R5P) and glycosyltransferases ( Tery_3818 ) were up‐regulated. These results provide new insight into how ROS and EPS of T. erythraeum increase in an acidified future ocean to cope with OA‐imposed stress.