β-Cyclocitral Does Not Contribute to Singlet Oxygen-Signalling in Algae, but May Down-Regulate Chlorophyll Synthesis.

ABSTRACT: Light stress signalling in algae and plants is partially orchestrated by singlet oxygen (¹O₂), a reactive oxygen species (ROS) that causes significant damage within the chloroplast, such as lipid peroxidation. In the vicinity of the photosystem II reaction centre, a major source of ¹O₂, are two β-carotene molecules that quench ¹O₂ to ground-state oxygen. ¹O₂ can oxidise β-carotene to release β-cyclocitral, which has emerged as a ¹O₂-mediated stress signal in the plant Arabidopsis thaliana. We investigated if β-cyclocitral can have similar retrograde signalling properties in the unicellular alga Chlamydomonas reinhardtii. Using RNA-Seq, we show that genes up-regulated

SUBMITTER: Roach T 

PROVIDER: S-EPMC9415740 | biostudies-literature | 2022 Aug

REPOSITORIES: biostudies-literature