Journal
PLANT PHYSIOLOGY AND BIOCHEMISTRY
Volume 141, Issue -, Pages 51-59Publisher
ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.plaphy.2019.05.011
Keywords
Arabidopsis; Antimony toxicity; Brassinosteroids; Synergistic interaction; Antioxidant system; Oxidative stress
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Funding
- National Natural Science Foundation of P. R. China [31100173, 31470230, 51320105006, 51604308]
- China Postdoctoral Science Foundation [2015M582348]
- Fundamental Research Funds for the Central Universities of Central South University [2017zzts818]
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Brassinosteroids (BRs) play a crucial role in improving plant resistance to various environmental stresses. In this study, we aimed to explore the potential role of BRs in protecting plants from antimony (Sb) toxicity. In the in vitro agar-plate culture experiments, the level changes of BR in wide-type plants and BR biosynthesis mutant dwrf4-1 significantly affected the corresponding response of Arabidopsis to Sb stress. Increasing the BR content significantly enhanced Sb-induced root growth inhibition and lowering the BR level appeared to reduce the plant sensitivity to Sb stress. Foliar application of eBL, however, significantly decreased the Sb accumulation and peroxidation of membrane lipids, increased the contents of chlorophyll and proline, and further boosted and strengthened the antioxidant enzymes activities. These experiments demonstrated that BRs played an important role in regulating heavy metal stress responses in plants and exogenous foliar spray of eBL was an important method for alleviating toxicity of Sb.
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