biologia plantarum

International journal on Plant Life established by Bohumil Němec in 1959

Biologia plantarum 64:302-313, 2020 | DOI: 10.32615/bp.2019.136

Silicon alleviates salt and drought stress of Glycyrrhiza uralensis plants by improving photosynthesis and water status

W.J. ZHANG1,2, X.J. ZHANG1, D.Y. LANG3, M. LI4, H. LIU4, X.H. ZHANG1,2,*
1 College of Pharmacy, Ningxia Medical University, Yinchuan 750004, P.R. China
2 Laboratory of Hui Ethnic Medicine Modernization, Ningxia Medical University, Yinchuan 750004, P.R. China
3 Laboratory Animal Center, Ningxia Medical University, Yinchuan 750004, P.R. China
4 Desertification Control Institute, Ningxia Academy of Agriculture and Forestry Sciences,Yinchuan 750002, P.R. China

Silicon has been widely reported to have a beneficial effect on improving plant tolerance to biotic and abiotic stresses. However, the mechanisms of Si in mediating responses to simultaneous salt and drought stresses are still poorly understood. Glycyrrhiza uralensis Fisch. is classified as a non-Si accumulator and suffered from salt and drought stresses. In this study, we investigated the long-term application of Si on Si content in G. uralensis roots, stems and leaves, leaf anatomy, ultrastructure, chlorophyll (Chl) content, gas exchange characteristics, relative water content, and growth of two-year-old plants under different salt and drought stresses. Silicon application resulted in a higher Si uptake in G. uralensis roots and more Si accumulation in leaves (especially deposition of Si on cell walls), and Si counteracted the adverse effects induced by salt and drought stresses on the leaf anatomy and ultrastructure. In plants treated with Si, a higher chlorophyll content, net photosynthetic rate and relative water content led to a higher growth rate and dry mass under salt and drought stresses compared with corresponding non-Si treated plants.

Keywords: chlorophyll, leaf ultrastructure, net photosynthetic rate, relative water content, stomatal conductance, transpiration rate, water use efficiency.

Received: January 29, 2019; Revised: October 10, 2019; Accepted: November 1, 2019; Published online: April 8, 2020  Show citation

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ZHANG, W.J., ZHANG, X.J., LANG, D.Y., LI, M., LIU, H., & ZHANG, X.H. (2020). Silicon alleviates salt and drought stress of Glycyrrhiza uralensis plants by improving photosynthesis and water status. Biologia plantarum, 64, Article 302-313. https://doi.org/10.32615/bp.2019.136
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