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Searching for biomarkers of early detection of 2,4-D effects in a native tree species from the Brazilian Cerrado biome.

Authors :
Silva FB
Costa AC
Müller C
Almeida GM
Nascimento KJT
Batista PF
Vital RG
Silva DG
Megguer CA
Jakelaitis A
Domingos M
Source :
Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes [J Environ Sci Health B] 2022; Vol. 57 (1), pp. 71-80. Date of Electronic Publication: 2022 Feb 04.
Publication Year :
2022

Abstract

Biodiversity in the Brazilian Cerrado biome has been declining sharply with the continued expansion of agriculture and the excessive use of herbicides. Thus, the aim of this study was to evaluate the morphophysiological and biochemical responses in Dipteryx alata plants to various doses of the herbicide 2,4-D. Specific biomarkers that characterize the phytoindicator potential of this species were determined. Gas exchange, chlorophyll a fluorescence, photosynthetic pigments, and the activities of antioxidant enzymes and cellulase were performed after 24, 96 and/or 396 hours after 2,4-D application (HAA). The herbicide caused higher antioxidant enzymatic activity 24 HAA and damage to the photosynthetic machinery after 96 HAA. Reduction in gas exchange, chlorophyll content, and photochemical traits were observed. Increased respiratory rates, non-photochemical quenching, and carotenoid concentrations in 2,4-D-treated plants were important mechanisms in the defense against the excess energy absorbed. Furthermore, the absence of leaf symptoms suggested tolerance of D. alata to 2,4-D. Nevertheless, changes in the photosynthetic and biochemical metabolism of D. alata are useful as early indicators of herbicide contamination, especially in the absence of visual symptoms. These results are important for early monitoring of plants in conserved areas and for preventing damage to sensitive species.

Details

Language :
English
ISSN :
1532-4109
Volume :
57
Issue :
1
Database :
MEDLINE
Journal :
Journal of environmental science and health. Part. B, Pesticides, food contaminants, and agricultural wastes
Publication Type :
Academic Journal
Accession number :
35114885
Full Text :
https://doi.org/10.1080/03601234.2022.2028528