Abstract
Key message
Our study elucidated that Q. dentata responds to Na2CO3 stress by excreting salt on the blade, accumulating osmotic protectants, and changing the cell ultrastructure and physiological-biochemical parameters of leaves.
Abstract
Quercus dentata Thunb is an important constructive species in the forest communities of the mountainous areas of northern China with high ecological and landscape value. However, soil salinization prevents the use of Q. dentata in the North China Plain. Therefore, it is necessary to explore how Q. dentata responds to saline-alkaline stress. Here, Q. dentata seedlings were exposed to different concentrations of an alkaline salt (Na2CO3) to determine the effects on leaf mesophyll cell ultrastructure and physiological-biochemical parameters. We first discovered crystallized deposits on the pressure side of Q. dentata leaf blades after the 100 mM Na2CO3 treatment. Scanning electron microscopy and energy-dispersive X-ray analysis revealed that the main component of the crystal deposits was sodium ions. However, no salt glands or bladders were detected in Q. dentata leaves. Moreover, the ultrastructure of the mesophyll cells changed as stress duration increased, and the number and size of the chloroplasts were limited by partial disintegration. The results also show that Na2CO3-stressed Q. dentata plants displayed increased soluble sugar and proline contents. Additionally, the low-concentration Na2CO3 stress slightly enhanced the activity of antioxidant enzymes, such as catalase (CAT), peroxidase (POD), and superoxide dismutase (SOD). In summary, the results show that the cell structure of Q. dentata leaves was damaged by Na2CO3 stress. However, accumulating osmoprotectants and the excretion of salt onto the leaf blades enhanced saline-alkaline stress tolerance.
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Data in this study are available from the corresponding authors upon reasonable request.
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Acknowledgements
This study was supported by the Innovative Transdisciplinary Program of Ecological Restoration Engineering under Beijing Municipal Education Commission (IDHT20190509), Scientific Research Project of Beijing Educational Committee (SQKM20181002015), and the grant for Beijing Forestry University Outstanding Postgraduate Mentoring Team Building (YJSY-DSTD2022005). We thank Editorbar Language Editing for editing the English text of a draft of this manuscript.
Funding
Beijing Forestry University Outstanding Postgraduate Mentoring Team Building, YJSY-DSTD2022005, Cunfu Lu, Innovative Transdisciplinary Program of Ecological Restoration Engineering under Beijing Municipal Education Commission,IDHT20190509, Scientific Research Project of Beijing Educational Committee, SQKM20181002015.
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PSL, CFL, and ZHH conceived and designed the study; WBW, LC, and WNC prepared the materials, conducted the experiments, WBW analyzed the data and prepared the results; WBW wrote the manuscript; PSL, ZHH, and CFL edited and improved the manuscript; all authors read and approved the final manuscript.
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Communicated by Jinxing Lin.
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Wang, WB., Cao, L., Chen, W. et al. Quercus dentata responds to Na2CO3 stress with salt crystal deposits: ultrastructure, and physiological–biochemical parameters of leaves. Trees 37, 1001–1011 (2023). https://doi.org/10.1007/s00468-023-02400-w
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DOI: https://doi.org/10.1007/s00468-023-02400-w