Most cited article - PubMed ID 39650670
Photosystems under high light stress: throwing light on mechanism and adaptation
The adverse effects of cadmium on plants are accompanied by a limitation of photosynthesis, due to the production of reactive oxygen species, leading to oxidative damage to PSII and the disruption of key protein complexes involved in photosynthetic pathways. We investigated the effects of cadmium stress combined with high light in Arabidopsis thaliana, as dependent on the cadmium dose applied. The aim was to investigate the combined effect of the two stressors on photochemical processes with the hypothesis that Cd stress enhances the negative effect of the high light. The plants were treated with 0, 1, 10, and 50 mM Cd added as CdCl2 solution to soil (potted plants), and a high light stress. The highest dose (50 mM) induced a significant oxidative stress, reduced chlorophyll fluorescence parameters related to PSII functioning and increased energy dissipation mechanisms. Elevated Cd contents impaired the electron transport and limited PSII efficiency. OJIP analysis revealed a Cd-induced K- and L-band appearance documenting LHC-PSII limitation. The combination of Cd and high light stress resulted in the photoinhibition effects in PSII, i.e., a decrease in potential and effective yields of PSII.
- Keywords
- OJIP, cadmium, chlorophyll fluorescence, heavy metal, nonphotochemical quenching, photoinhibition, protective mechanisms,
- MeSH
- Arabidopsis * drug effects radiation effects physiology metabolism MeSH
- Chlorophyll metabolism MeSH
- Photochemical Processes * drug effects radiation effects MeSH
- Photosynthesis * drug effects radiation effects MeSH
- Photosystem II Protein Complex metabolism MeSH
- Stress, Physiological * drug effects MeSH
- Cadmium * toxicity pharmacology MeSH
- Oxidative Stress drug effects radiation effects MeSH
- Reactive Oxygen Species metabolism MeSH
- Light * MeSH
- Electron Transport drug effects MeSH
- Publication type
- Journal Article MeSH
- Names of Substances
- Chlorophyll MeSH
- Photosystem II Protein Complex MeSH
- Cadmium * MeSH
- Reactive Oxygen Species MeSH
