The physiological response of Artemisia annua L. to salt stress and salicylic acid treatment |
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Authors: | Lin Li Haihui Zhang Li Zhang Yonghong Zhou Ruiwu Yang Chunbang Ding Xiaoli Wang |
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Institution: | 1. College of Life and Basic Sciences, Sichuan Agricultural University, No.46 Xinkang Road, Yucheng District, 625014, Ya’an City, China 2. Triticeae Research Institute, Sichuan Agricultural University, No.211 Huimin Road, Wenjiang District, 611130, Chengdu City, China
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Abstract: | Salinity has a great influence on plant growth and distribution. A few existing reports on Artemisia annua L. response to salinity are concentrated on plant growth and artemisinin content; the physiological response and salt damage mitigation are yet to be understood. In this study, the physiological response of varying salt stresses (50, 100, 200, 300, or 400 mM NaCl) on A. annua L. and the effect of exogenous salicylic acid (0.05 or 0.1 mM) at 300-mM salt stress were investigated. Plant growth, antioxidant enzyme activity, proline, and mineral element level were determined. In general, increasing salt concentration significantly reduced plant growth. Superoxide dismutase (SOD), peroxidase (POD), and catalase (CAT) were stimulated by salt treatment to a higher enzyme activity in treated plants than those in untreated plants. Content of proline had a visible range of increment in the salt-treated plants. Distribution of mineral elements was in inconformity: Na+ and Ca2+ were mainly accumulated in the roots; K+ and Mg2+ were concentrated in leaves and stems, respectively. Alleviation of growth arrest was observed with exogenous applications of salicylic acid (SA) under salt stress conditions. The activity of SOD and POD was notably enhanced by SA, but the CAT action was suppressed. While exogenous SA had no discernible effect on proline content, it effectively inhibited excessive Na+ absorption and promoted Mg2+ absorption. Ca2+ and K+ contents showed a slight reduction when supplemented with SA. Overall, the positive effect of SA towards resistance to the salinity of A. annua will provide some practical basis for A. annua cultivation. |
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Keywords: | Antioxidase Mineral elements Proline SA Salt stress |
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