Abstract
Two salt-sensitive (Yongliang-15, GS-6058) and two salt-tolerant (JS-7, Xinchun-31) wheat cultivars were used to investigate the extension, extensibility (viscoelastic parameters), and chemical composition of the cell walls in their root elongation regions (apical 10 mm-long root segments), under salinity stress. The elasticity of the root cell wall, indicated by E0, significantly decreased in the salt-sensitive cultivars, whereas the E0 in the salt-tolerant cultivars was maintained at the same level as that in the non-saline condition. Root extension and the differences among cultivars were largely dependent on elastic extension, which accounts for one-half to two-thirds of the total extension. Viscosity, indicated by η0, and the plastic extension of the root cell walls did not change across the treatments and cultivars. The significant decrease in cell wall elasticity in the root elongation region was one of the factors that depressed root growth in salt-sensitive cultivars under the saline condition. The well-maintained elasticity of salt-tolerant cultivars alleviated the depression of root growth by NaCl. Cell wall elasticity was positively correlated with the relative pectin and hemicellulose I contents and negatively correlated with the relative cellulose content. Under saline conditions, the relative hemicellulose II content did not change in the salt-sensitive cultivars; however, it decreased in the salt-tolerant ones. Thus, changes in chemical composition of the cell wall were correspond with the cell wall extensibility and root growth in wheat cultivars with different degrees of salt tolerance.
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This study is partially funded by the Grant-in-Aid for Scientific Research (C) of Japan Society for the Promotion of Science, No. 26450020.
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This study is partially funded by the Grant-in-Aid for Scientific Research (C) of Japan Society for the Promotion of Science, No. 26450020.
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Yang Shao designed and carried out the experiments, analyzed the results. Yang Shao and Ping An wrote the manuscript. Xiaohui Feng, Irshad Muhammad, Victoria Otie, Weiqiang Li and Yuanrun Zheng provided scientific advice, and revised the manuscript. Ping An conceived the research area and supervised the project.
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Shao, Y., An, P., Feng, X. et al. Differential responses of roots for varying tolerance to salinity stress in wheat with special reference to elasticity. Plant Growth Regul 94, 183–193 (2021). https://doi.org/10.1007/s10725-021-00707-7
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DOI: https://doi.org/10.1007/s10725-021-00707-7