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Abscisic acid alleviates mercury toxicity in wheat (Triticum aestivum L.) by promoting cell wall formation.
- Source :
-
Journal of Hazardous Materials . May2023, Vol. 449, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- Mercury (Hg) is a heavy metal (HM) that affects crop growth and productivity. In a previous study, we found that application of exogenous abscisic acid (ABA) alleviated growth inhibition in Hg-stressed wheat seedlings. However, the physiological and molecular mechanisms underlying ABA-mediated Hg detoxification remained unclear. In this study, Hg exposure reduced the plant fresh and dry weights and root numbers. Exogenous ABA treatment significantly resumed the plant growth, increased the plant height and weight, and enriched the roots numbers and biomass. The application of ABA enhanced Hg absorption and raised the Hg levels in the roots. In addition, exogenous ABA decreased Hg-induced oxidative damage and significantly brought down the activities of antioxidant enzymes, such as SOD, POD and CAT. Global gene expression patterns in the roots and leaves exposed to HgCl 2 and ABA treatments were examined via RNA-Seq. The data showed that genes related to ABA-mediated Hg detoxification were enriched in functions related to cell wall formation. Weighted gene co-expression network analysis (WGCNA) further indicated that the genes implicated in Hg detoxification were related to cell wall synthesis. Under Hg stress, ABA significantly induced expression of the genes encoding cell wall synthesis enzymes, regulated the activity of hydrolase, and increased the concentrations of cellulose and hemicellulose, hence promoting cell wall synthesis. Taken together, these results suggest that exogenous ABA could alleviate Hg toxicity in wheat by promoting cell wall formation and suppressing translocation of Hg from roots to shoots. [Display omitted] • Exogenous ABA increases Hg tolerance, and cause Hg accumulation in the wheat seedlings. • Exogenous ABA alleviates the Hg toxicity by increasing cellulose and hemicellulose concentration in roots. • Exogenous ABA alleviates Hg toxicity by mitigating the Hg induced oxidative damage. • Hg detoxification genes were significantly enriched in the cell wall synthesis. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 03043894
- Volume :
- 449
- Database :
- Academic Search Index
- Journal :
- Journal of Hazardous Materials
- Publication Type :
- Academic Journal
- Accession number :
- 162208405
- Full Text :
- https://doi.org/10.1016/j.jhazmat.2023.130947