Abstract
Salt stress is a critical factor that affects the growth and development of plants. Salicylic acid (SA) is an important signal molecule that mitigates the negative effects of salt stress on plants. To elucidate salt tolerance in large pink Dianthus superbus L. (Caryophyllaceae) and the regulatory mechanism of exogenous SA on D. superbus under different salt stresses, we conducted a pot experiment to evaluate leaf biomass, leaf anatomy, soluble protein and sugar content, and the relative expression of salt-induced genes in D. superbus under 0.3, 0.6, and 0.9% NaCl conditions with and without 0.5 mM SA. The result showed that exposure of D. superbus to salt stress lead to a decrease in leaf growth, soluble protein and sugar content, and mesophyll thickness, together with an increase in the expression of MYB and P5CS genes. Foliar application of SA effectively increased leaf biomass, soluble protein and sugar content, and upregulated the expression of MYB and P5CS in the D. superbus, which facilitated in the acclimation of D. superbus to moderate salt stress. However, when the plants were grown under severe salt stress (0.9% NaCl), no significant difference in plant physiological responses and relevant gene expression between plants with and without SA was observed. The findings of this study suggest that exogenous SA can effectively counteract the adverse effects of moderate salt stress on D. superbus growth and development.
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Acknowledgements
The Zhejiang Province Wenzhou Science and Technology Plan Projects (N20140021) and The Zhejiang ProvinceWenzhou Demonstration Generalization Projects of Four New Science and Technology of Forestry (WZHX2016-11-236) supported this study. The authors also thank Accdon for its linguistic assistance during the preparation of this manuscript.
Funding
Funding was provided by The Zhejiang Province Wenzhou Science and Technology Plan Projects (N20140021) and The Zhejiang Province Wenzhou demonstration generalization projects of four new science and technology of forestry (WZHX2016-11-236).
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Zheng, J., Ma, X., Zhang, X. et al. Salicylic acid promotes plant growth and salt-related gene expression in Dianthus superbus L. (Caryophyllaceae) grown under different salt stress conditions. Physiol Mol Biol Plants 24, 231–238 (2018). https://doi.org/10.1007/s12298-017-0496-x
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DOI: https://doi.org/10.1007/s12298-017-0496-x