Effect of salicylic acid pretreatment on drought stress responses of zoysiagrass (Zoysia japonica)
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- 作者：Z. L. Chen (1)
X. M. Li (2)
L. H. Zhang (1) - 关键词：Zoysia japonica ; drought ; salicylic acid ; antioxidant enzymes ; lipid peroxidation
- 刊名：Russian Journal of Plant Physiology
- 出版年：2014
- 出版时间：September 2014
- 年：2014
- 卷：61
- 期：5
- 页码：619-625
- 全文大小：792 KB
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X. M. Li (2)
L. H. Zhang (1)
1. School of Environmental Science, Liaoning University, Shenyang, 110036, China
2. College of Chemistry and Life Science, Shenyang Normal University, Shenyang, 110034, China - ISSN：1608-3407
文摘
The present study was carried out to examine the effects of exogenous salicylic acid (SA) on growth, activities of antioxidant enzymes, and some physiological and biochemical characteristics of zoysiagrass (Zoysia japonica Steud.) plants subjected to drought. Aqueous 0.1, 0.5, or 1.0 mM SA solution was sprayed on the leaves of zoysiagrass for 3 days. Drought was induced by withholding watering for 16 days after SA application. Biomass, chlorophyll content, net photosynthetic rate (P n), activities of antioxidant enzymes (e.g., superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT)), MDA and proline contents were determined. Pretreatments with 0.1 and 0.5 mM SA significantly increased fresh and dry weights and chlorophyll content, while 1 mM SA pretreatment did not show significant change compared to controls. SA pretreatments showed a marked increase in P n compared with controls from the 7th to 16th day after drought start. Activities of SOD, POD, and CAT were increased by SA pretreatments. MDA and proline contents after 0.1 and 0.5 mM pretreatments were lower than those of controls from the 6th to 12th day of drought, while 1 mM SA pretreatment did not show significant change from the 0th to 9th day of drought. This work suggests that suitable exogenous SA (0.5 mM) helps zoysiagrass to perform better under drought stress by enhancing the net photosynthetic rate and antioxidant enzyme activities while decreasing lipid peroxidation as compared to the controls. SA could be used as a potential growth regulator for improving plant growth under drought stress.