Toxic effects of lanthanum(III) on photosynthetic performance of rice seedlings: Combined chlorophyll fluorescence, chloroplast structure and thylakoid membrane protein assessment.

Autor: Jiang D; Jiangsu Key Laboratory for Biofunctional Molecules, College of Life Sciences and Chemical Engineering, Jiangsu Second Normal University, Nanjing 211222, China; Jiangsu Key Laboratory of Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China., Gao W; Jiangsu Key Laboratory of Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China., Chen G; Jiangsu Key Laboratory of Biodiversity and Biotechnology, College of Life Sciences, Nanjing Normal University, Nanjing 210023, China. Electronic address: guoxiangchennjnu@163.com.
Jazyk: angličtina
Zdroj: Ecotoxicology and environmental safety [Ecotoxicol Environ Saf] 2023 Nov 15; Vol. 267, pp. 115627. Date of Electronic Publication: 2023 Oct 25.
DOI: 10.1016/j.ecoenv.2023.115627
Abstrakt: Rare earth elements (REEs) are emerging as an anticipated pollution in the environment due to their active use in many areas. However, the effects of REEs on the photosynthesis of rice have not been thoroughly explored. Therefore, this study emphasizes how high levels of La(III) affect the thylakoid membrane of rice seedlings, thereby inhibiting photosynthesis and growth. Here, we reported that rice plants treated with La(III) exhibited an increase in La accumulation in the leaves, accompanied by a decrease in chlorophyll content and photosynthetic capacity. La(III) exposure decreased Mg content in leaves, but possibly increased other nutrients including Cu, Mn, and Zn through systemic endocytosis. K-band and L-band appeared in the fluorescence OJIP transients, indicating La(III) stress destroyed the donor and receptor sides of photosystem II (PSII). Numerous reaction centers (RC/CS m ) were inactivated by La(III) treatment, which resulted in a reduction in electron transport capacity (decreased ET o /RC and ET o /CS m ) and an increase in the dissipation of the excess excitation energy by heat (increased DI o /RC and DI o /CS m ). The BN-PAGE analysis of thylakoid membrane protein complexes showed that La(III) induced the degradation of supercomplexes, PSII core, LHCII, PSI core, LHCI, and F1-ATPase binding Cyt b 6 f complex. Collectively, this study revealed that La(III) causes significant degradation of thylakoid membrane proteins, thereby promoting the decomposition of photosynthetic complexes, ultimately destroying the chloroplast structure and reducing the photosynthetic performance of rice seedlings.
Competing Interests: Declaration of Competing Interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
(Copyright © 2023 The Authors. Published by Elsevier Inc. All rights reserved.)
Databáze: MEDLINE
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