Abstract
Salt stress affects the physiological processes and morphological structure of plants, thereby inhibiting plant growth and development and reducing the fruit yield and quality. Most cherry rootstocks are sensitive to excessive salt and alkaline conditions. Salicylic acid (SA) plays a role in the response to various abiotic stresses. To determine the effects of SA on the resistance of cherry rootstocks to salt stress, a salt environment was simulated by watering with a 100-mM NaCl solution and then spraying leaves with 1.0-mM SA. Salt treatment significantly decreased the photosynthetic rate (Pn) and ratio of variable fluorescence to maximum fluorescence (Fv/Fm) of cherry rootstocks, whereas SA application increased the Pn and Fv/Fm in the salt stress with SA-treat group. Meanwhile, SA reduces the accumulation of Na+ and H2O2 in leaves. Additionally, the activities of antioxidant enzyme (peroxidase, catalase, and superoxide dismutase) were increased under salt stress, and this increase was more obvious under salt stress with SA application treatment, indicating SA contribution in improving the salt tolerance. RNA-seq analysis of cherry rootstocks treated with 1.0-mM SA, 100-mM NaCl, and both 1.0-mM SA with 100-mM NaCl, revealed 537, 298, and 521 significantly differentially expressed genes (DEGs), respectively. The main DEGs were phytohormone-related genes, stress-related transcription factors, Ca2+ signaling-related genes, and other functional protein-related genes. Overall, our study contributes to the understanding of the molecular mechanisms of SA-induced salt tolerance in cherry rootstocks.
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Acknowledgements
We thank assistant professor Muhammad Salman Haider from Ghazi University for proofreading the manuscript. We also thank Professor Jiang Lu and associate professor Lu Liu from Shanghai Jiaotong University for the equipment assistance.
Funding
This study was funded by China Agriculture Research System (Grant No. CARS-30-2-08), Shanghai Agriculture Applied Technology Development Program, China (Grant No. 2022-02-08–00-12-F01111), Natural Science Foundation of Shanghai (23ZR1430600), Shanghai Sailing Program (Grant No. 21YF1422100), Startup Fund for Young Faculty at SJTU (Grant No. 21X010500643), and Science and Technology Plan Project in Haining City, Zhejiang Province (2021001).
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JX conducted the experiments, prepared figures, and wrote the manuscript. YX, YW, and ZL participated in the experiments and data analysis. WS and XL contributed to the experimental methods. MAM, RL, and SW contributed with consultation. CZ and SJ managed the research and revised the manuscript. All authors read and approved the final manuscript.
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344_2023_11195_MOESM1_ESM.tif
Supplementary file1 (TIF 9954 KB) Pearson’s correlation analysis revealed a strong association among the three biological replicates of each group (CK, T1, T2, and T3). The correlation coefficient between 0.8 and 1.0 is extremely strong, indicating that the expression patterns between samples are similar
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Supplementary file2 (TIF 1621 KB) Principal component analysis on each group (CK, T1, T2, and T3) according to the expression level clusters similar samples together and the distance indicates the similarity between samples
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Supplementary file3 (TIF 8022 KB) Circular visualization of the DEGs in cherry rootstocks (Cerasus spp.) under control and salt stress with or without SA application. The red and green histograms represent the log2Fold-change values of upregulated and downregulated genes, respectively, and the gray scatter plot shows the log2Fold-change values for the non-differentially expressed genes
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Supplementary file4 (TIF 1577 KB) Difference and significance analysis for the DEGs in CK vs. T1, CK vs. T2, CK vs. T3, T1 vs. T3 and T2 vs. T3 comparisons using volcano plots. CK, control; T1, 1.0-mM SA treatment; T2, salt stress; T3, salt stress with 1.0-mM SA treatment
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Supplementary file5 (TIF 10991 KB) Gene ontology classification and enrichment analysis of the differentially expressed genes in CK vs. T1, CK vs. T2, CK vs. T3, T1 vs. T3 and T2 vs. T3 comparisons
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Supplementary file6 (TIF 10488 KB) KEGG pathway classification and enrichment analysis of the differentially expressed genes in CK vs. T1, CK vs. T2, CK vs. T3, T1 vs. T3, and T2 vs. T3 comparisons
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Supplementary file7 (TIF 1336 KB) Expression profiles of the DEGs related to CTK biosynthesis and signaling pathway are shown by a heatmap. The scale of color intensity is shown in the lower left quarter of the heatmap, representing the log2fold-change values. Fold-change refers to the ratio of gene expression levels in cherry rootstock leaves between the CK and treatments (T1/T2/T3)
344_2023_11195_MOESM8_ESM.tif
Supplementary file8 (TIF 1133 KB) Expression profiles of the DEGs related to GA biosynthesis and signaling pathway are shown by a heatmap. The scale of color intensity is shown in the lower left quarter of the heatmap, representing the log2fold-change values. Fold-change refers to the ratio of gene expression levels in cherry rootstock leaves between the CK and treatments (T1/T2/T3)
344_2023_11195_MOESM9_ESM.tif
Supplementary file9 (TIF 1865 KB) Expression profiles of the DEGs related to ETH biosynthesis and signaling pathway are shown by a heatmap. The scale of color intensity is shown in the lower left quarter of the heatmap, representing the log2fold-change values. Fold-change refers to the ratio of gene expression levels in cherry rootstock leaves between the CK and treatments (T1/T2/T3)
344_2023_11195_MOESM10_ESM.tif
Supplementary file10 (TIF 2622 KB) A heatmap shows the expression profiles of the DEGs related to stress-associated proteins. The scale of color intensity is shown in the lower left quarter of the heatmap, representing the log2fold-change values. Fold-change refers to the ratio of gene expression levels in cherry rootstock leaves between the CK and treatments (T1/T2/T3)
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Xu, J., Xu, Y., Wang, Y. et al. Exogenous Salicylic Acid Improves Photosynthetic and Antioxidant Capacities and Alleviates Adverse Effects of Cherry Rootstocks Under Salt Stress. J Plant Growth Regul 43, 1428–1446 (2024). https://doi.org/10.1007/s00344-023-11195-6
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DOI: https://doi.org/10.1007/s00344-023-11195-6