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Combined effects of heatwaves and atmospheric CO₂ levels on Brassica juncea phytoremediation.

Authors :
Gong H
Dai L
Hu X
Luo J
Feng S
Source :
Chemosphere [Chemosphere] 2024 Sep; Vol. 363, pp. 142901. Date of Electronic Publication: 2024 Jul 18.
Publication Year :
2024

Abstract

Heatwaves, expected to become more frequent, pose a significant threat to plant biomass production. This experiment was designed to estimate heatwave influence on Brassica juncea phytoremediation when superimposed on different CO <subscript>2</subscript> levels. A 7-day heatwave was generated during the species flowering stage. Heatwaves decreased all B. juncea dry weights. The lowest species dry weight was recorded when the heatwave was accompanied by 250 ppm CO <subscript>2</subscript> , in which the biomass significantly decreased by 40.0% relative to that of no heatwave under the same atmospheric CO <subscript>2</subscript> conditions. Heatwave superposition with 250 ppm CO <subscript>2</subscript> reduced the Cd content in B. juncea aerial parts by 28.1% relative to that of identical environmental conditions without heatwave, whereas the opposite result was observed under 550 ppm CO <subscript>2</subscript> conditions. The heatwave caused oxidative damage to B. juncea under all CO <subscript>2</subscript> conditions, as manifested by increased malondialdehyde levels in the plant shoots. With heatwave superposition, antioxidant enzyme activity was enhanced by exposure to 400 and 550 ppm CO <subscript>2</subscript> . Considering biomass yield generation and Cd uptake capacity, heatwave superposition decreased the B. juncea phytoremediation effects, and high atmospheric CO <subscript>2</subscript> conditions could alleviate detrimental effects to a certain extent. This study uniquely examines the combined effects of heatwaves and varying CO <subscript>2</subscript> levels on phytoremediation, providing microscopic insights into oxidative damage and enzyme activity, highlighting the potential for CO <subscript>2</subscript> enrichment to mitigate heatwave impacts, and offering comprehensive analysis for future agricultural practices and environmental management.<br />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.<br /> (Copyright © 2024 Elsevier Ltd. All rights reserved.)

Details

Language :
English
ISSN :
1879-1298
Volume :
363
Database :
MEDLINE
Journal :
Chemosphere
Publication Type :
Academic Journal
Accession number :
39029714
Full Text :
https://doi.org/10.1016/j.chemosphere.2024.142901