Journal
ENVIRONMENTAL POLLUTION
Volume 235, Issue -, Pages 692-699Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.envpol.2017.12.079
Keywords
Phytotoxicity; Decabromodiphenyl ether; Antioxidant-related metabolites; Rice cultivars
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Funding
- National Natural Science Foundation of China [21520102009, 21621005]
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Decabromodiphenyl ether (BDE-209), as a major component of brominated flame retardants, has been detected in the agricultural soil in considerable amount. Given that BDE-209 is toxic, ubiquitous and persistent, BDE-209 might induce toxic effects on rice cultivars planted in contaminated soil. A comparative study was conducted on phytotoxicities and GC-MS based antioxidant-related metabolite levels to investigate the differences of phytotoxicities of BDE-209 to rice cultivars in Yangtze River Delta of China. Rice seedlings were treated with BDE-209 at 0, 10, 50, 100 and 500 mu g/L in a hydroponic setup. Results showed that BDE-209-induced phytotoxicites were cultivar-dependent and that the antioxidant defense systems in the cultivars were disturbed differently. Among the three selected cultivars (Jiayou 5, Lianjing 7 and Yongyou 9), Jiayou 5 and Lianjing 7 displayed lower toxic effects than Yongyou 9 in terms of the growth inhibition, lipid peroxidation and DNA damage. The increases of antioxidant enzymes were significantly higher in Jiayou 5 and Lianjing 7 than those in Yongyou 9. Multivariate analysis of antioxidant-related metabolites in the three cultivars indicated that L-tryptophan and L-valine were the most important ones among 10 metabolites responsible for the separation of cultivars. The up-regulation of L-tryptophan and L-valine were likely plant strategies to increase their tolerance. The current results provided an insight into the development of rice cultivars with higher BDE-209 tolerance. (C) 2018 Elsevier Ltd. All rights reserved.
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