Epibrassinolide confers zinc stress tolerance by regulating antioxidant enzyme responses, osmolytes, and hormonal balance in Solanum melongena seedlings

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• 作者：Jie He ; Yijun Wang ; Haidong Ding ; Cailin Ge
• 关键词：Antioxidant defense system ; Eggplant ; 24 ; epibrassinolide ; Hormonal balance ; Osmolytes ; Oxidative stress ; Zinc stress
• 刊名：Brazilian Journal of Botany
• 出版年：2016
• 出版时间：March 2016
• 年：2016
• 卷：39
• 期：1
• 页码：295-303
• 全文大小：616 KB
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• 作者单位：Jie He (1)
  Yijun Wang (1)
  Haidong Ding (1)
  Cailin Ge (1)
  
  1. Key Laboratory of Crop Genetics and Physiology of Jiangsu Province, College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, China
  
• 刊物主题：Plant Systematics/Taxonomy/Biogeography;
• 出版者：Springer International Publishing
• ISSN：1806-9959

文摘

Brassinosteroids have been widely applied to confer plant resistance to various stresses. The objective of this study was to evaluate the role of exogenous epibrassinolide (EBL) in some physiological processes in the leaves of eggplant (Solanum melongena L.) seedlings grown under zinc (Zn) stress conditions. Exposure to 10 mM Zn treatment for 8 days led to an inhibition of eggplant growth, a decrease in chlorophyll level, and an aggravation of oxidative damage. Exogenous spray of 0.1 µM EBL dramatically alleviated oxidative damage caused by excess Zn, as shown by decreases in the levels of malondialdehyde and superoxide anion, and increases in plant growth, chlorophyll content, and antioxidant enzyme activities of superoxide dismutase, guaiacol peroxidase, catalase, and ascorbate peroxidase in the leaves of eggplant seedlings under Zn stress. It was also observed that osmolytes such as soluble sugars and free proline were further increased in EBL plus Zn-treated eggplant seedlings. Furthermore, EBL treatment alone or in combination with Zn stress significantly enhanced indole-3-acetic acid and zeatin riboside contents, while a sharp increase in abscisic acid content was recorded for EBL application under Zn stress. Results in the present work revealed that EBL greatly alleviated harmful effects of Zn stress on eggplants by activating antioxidant enzyme responses, accumulation of osmolytes, and balancing endogenous hormones.