Cell death responses to acute high light mediated by non-photochemical quenching in the dinoflagellate Karenia brevis.

ABSTRACT: Programmed cell death (PCD) can be induced in microalgae by many abiotic challenges via generation of reactive oxygen species (ROS). Marine phytoplankton live in a highly variable light environment, yet the potential for excess photosynthetically available radiation to trigger PCD has not been examined. On the other hand, photoprotective non-photochemical quenching (NPQ) is hypothesized to counteract intracellular ROS, potentially preventing cell death. The main objective of this study is to investigate high-light-induced death processes and their relationship with photosynthesis in bloom-forming dinoflagellate Karenia brevis. Here, we characterized the prevalence of ROS, caspase-like enzyme activity and cell death as well as photosynthetic status under acute irradiance of 500, 750 or 1000

SUBMITTER: Gao Y 

PROVIDER: S-EPMC9388518 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature