Abstract
Main conclusion
Auxin acts upstream of NO through NOA and XXT5 pathways to regulate the binding capacity of the root cell wall to Al.
Abstract
In our previous study, we identified an unknown mechanism by which 1-naphthaleneacetic acid (NAA) decreased the fixation of aluminum (Al) in the cell wall. Here, we observed that external application of the nitric oxide (NO) donor S-nitrosoglutathion (GSNO) increased the inhibition of Al on root elongation. Further analysis indicated that GSNO could induce Al accumulation in the roots and root cell walls, which is consistent with lower xyloglucan content. In comparison to the Columbia-0 (Col-0) wild type (WT), endogenous NO-reduced mutants noa1 (NOA pathway) and nia1nia2 (NR pathway) were more resistant to Al, with lower root Al content, higher xyloglucan content, and more Al accumulation in the root cell walls. By contrast, the xxt5 mutant with reduced xyloglucan content exhibited an Al-sensitive phenotype. Interestingly, Al treatment increased the endogenous auxin and NO levels, and the auxin levels induced under Al stress further stimulated NO production. Auxin application reduced Al retention in hemicellulose and decreased the xyloglucan content, similar to the effects observed with GSNO. In yucca and aux1-7 mutants, exogenous application of NO resulted in responses similar to those of the WT, whereas exogenous auxin had little effect on the noa1 mutant under Al stress. In addition, as auxin had similar effects on the nia1nia2 mutant and the WT, exogenous auxin and NO had little effect on the xxt5 mutant under Al stress, further confirming that auxin acts upstream of NO through NOA and XXT5 pathways to regulate the binding capacity of the root cell wall to Al.
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Abbreviations
- ALS1:
-
Aluminum sensitive 1
- GSNO:
-
S-nitrosoglutathion
- L-NAME:
-
Nw-nitro-l-Arg-methylester
- NAA:
-
1-Naphthaleneacetic acid
- NO:
-
Nitric oxide
- NOA:
-
Nitric oxide-associated
- NR:
-
Nitrate reductase
- XXT:
-
Xyloglucan xylosyltransferase
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Acknowledgements
This study was supported by the Foundation for Distinguished Young Scholars of Jiangsu Province, China [grant no. BK20190050] and the Youth Innovation Promotion Association of the Chinese Academy of Sciences [Grant No. 2015250]. We would like to thank Editage (www.editage.cn) for English language editing. Thanks are also given to the editor and the anonymous reviewer for their valuable comments to improve the quality of our work.
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XFZ and RFS designed the experiments; SL, JYS and HYW performed the experiments and analyzed the data; SL wrote the manuscript; HKJ and XFZ revised the manuscript. All authors have read and approved the manuscript.
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Li, S., Sun, J.Y., Wang, H.Y. et al. Auxin acts upstream of nitric oxide to regulate cell wall xyloglucan and its aluminium-binding capacity in Arabidopsis thaliana. Planta 259, 52 (2024). https://doi.org/10.1007/s00425-024-04331-3
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DOI: https://doi.org/10.1007/s00425-024-04331-3