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- Title
ENRICHMENT EFFECT OF PHYTOHORMONES ON ARSENIC UPTAKE AND TOLERANCE MECHANISM OF LANDOLTIA PUNCTATA.
- Authors
HU, L.; LIAO, Y. H.; ZHONG, Z. Y.; QIU, J.; WANG, J. P.; FAN, H. B.; WU, D. S.; SHENG, F. F.; FANG, H. Y.
- Abstract
Arsenic (As) contamination of water can pose a significant threat to human health. Landoltia punctata is a superior water ecological restoration plant that can absorb As and thus manage the problem of As overload in the aquatic environment. Phytohormones play an important role in regulating plant growth and improving heavy metal resistance. In this study, the enrichment effect of phytohormones on As uptake and tolerance mechanism of L. punctata at different concentrations were investigated. The results showed that the application of Indolent-3-acetic (IAA), Abscisic acid (ABA) and Kinetin (KT) were all effective in increasing chlorophyll a (Ca) and carotenoid (Cc) contents. Low concentrations of phytohormones from 0.001 to 1 μmol·L-1 had a facilitative effect on fluorescence parameters in the order of IAA > ABA > KT. The application of high concentrations of phytohormones inhibited the fluorescence parameters. The application of 0.1 μmol·L-1 IAA, ABA and KT treatments were the most effective in promoting As uptake in L. punctata. The effect sequence of different plant hormone on As enrichment was: ABA > IAA ≥ KT. Low concentrations of IAA, ABA and KT treatments all significantly increased superoxide dismutase (SOD) and glutathione reductase (GR) activities, significantly decreased malondialdehyde (MDA) and H2O2 contents and promoted proline synthesis in As-stressed L. punctata. This indicates that the application of phytohormones can improve the antioxidant activity of As-stressed L. punctata, promote the growth of L. punctata and improve its As absorption capacity. This study may provide a scientific basis for phytohormones to promote the remediation of As-contaminated waters by L. punctata, and can provide scientific basis for phytohormones to promote the remediation of Ascontaminated waters by L. punctata.
- Subjects
ABSCISIC acid; GLUTATHIONE reductase; ARSENIC; WATER pollution; SUPEROXIDE dismutase; PLANT hormones
- Publication
Applied Ecology & Environmental Research, 2024, Vol 22, Issue 1, p489
- ISSN
1589-1623
- Publication type
Article
- DOI
10.15666/aeer/2201_489506