AI Article Synopsis
- The study investigated how cadmium (Cd) affects the photosynthetic processes in young barley and maize plants through chlorophyll fluorescence and light absorption measurements.
- It was found that Cd accumulation impacted the efficiency of photosystem I (PSI) and photosystem II (PSII), with specific limitations appearing at different concentrations (80 μM and 250 μM).
- The results suggest that at 80 μM, Cd directly affects PSII, while at 250 μM, it has an indirect effect, and the changing dynamics could be linked to Cd/Cu substitution in plastocyanin, although the detailed mechanisms remain unclear.
Article Abstract
We searched for a direct Cd action on the photosynthetic electron transport chain using induced chlorophyll fluorescence and P light absorption. Young barley and maize plants were treated with Cd in concentrations of toxic (80 μM) and nearly lethal (250 μM). The maximal and relative photochemical activities of PSI, its major limitation at the donor side, and partially acceptor-side limitation of PSII changed in agreement with Cd accumulation in the corresponding chloroplasts. Acceptor-side limitation of PSII increased with a direct Cd action at 80 μM that was overcome with an indirect Cd action at 250 μM. These alterations can be explained by Cd/Cu substitution in plastocyanin. The photochemical and nonphotochemical quenching by PSII varied diversely which cannot be explained unambiguously by any mechanism. The limitations of PSI [Y, Y] and PSII (q) were compared for the first time. They were ranged: Y < q < Y.
Download full-text PDF |
Source |
|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11613828 | PMC |
| http://dx.doi.org/10.32615/ps.2024.018 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Want AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!