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Dunaliella Ds-26-16 acts as a global regulator to enhance salt tolerance by coordinating multiple responses in Arabidopsis seedlings

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Abstract

Main conclusion

Based on phenotypic, physiological and proteomic analysis, the possible mechanism by which Ds-26-16 regulates salt tolerance in Arabidopsis seedlings was revealed.

Abstract

Functional and mechanistic characterization of salt tolerance genes isolated from natural resources is crucial for their application. In this study, we report the possible mechanism by which Ds-26-16, a gene from Dunaliella, and its point mutation gene EP-5, enhance salt tolerance in Arabidopsis seedlings. Both Ds-26-16 and EP-5 transgenic lines displayed higher seed germination rates, cotyledon-greening rates, soluble sugar contents, decreased relative conductivity and ROS accumulation when germinating under 150 mM NaCl conditions. Comparative proteomic analysis revealed that there were 470 or 391 differentially expressed proteins (DEPs) in Ds-26-16 or EP-5, respectively, compared with the control (3301) under salt stress. The GO and KEGG enrichment analyses showed the DEPs in Ds-26-16 vs. 3301 and EP-5 vs. 3301 were similar and mainly enriched in photosynthesis, regulation of gene expression, carbohydrate metabolism, redox homeostasis, hormonal signal and defense, and regulation of seed germination. Thirty-seven proteins were found to be stably expressed under salt stress due to the expression of Ds-26-16, and eleven of them contain the CCACGT motif which could be bound by the transcription factor in ABA signaling to repress gene transcription. Taken together, we propose that Ds-26-16, as a global regulator, improves salt-tolerance by coordinating stress-induced signal transduction and modulating multiple responses in Arabidopsis seedlings. These results provide valuable information for utilizing natural resources in crop improvement for breeding salt-tolerant crops.

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Data availability

The mass spectrometry proteomics data have been deposited to the ProteomeXchange Consortium (http://proteomecentral.proteomexchange.org) via the iProX partner repository (Ma et al. 2019) with the dataset identifier PXD031133. Other datasets and plant materials generated during the study are available from the corresponding author upon request.

Abbreviations

ACO2:

1-aminocyclopropane-1-carboxylate oxidase

BP:

Biological process

CAS:

Calcium sensing receptor

DEP:

Differentially expressed protein

MLP:

Major latex protein

MS:

Murashige and Skoog

RC:

Relative conductivity

TF:

Transcription factor

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Acknowledgements

This work was supported by Grants from the National Natural Science Foundation of China (No. 32070349), the Fundamental Research Funds for the Central Universities, Nankai University (No. 60), and the Natural Science Foundation of Tianjin (No. 21JCYBJC00010).

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Correspondence to Xi-Wen Chen or De-Fu Chen.

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The authors declare that they have no conflicts of interest. All authors agree with the authorship and submission of the manuscript for peer review.

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Communicated by Dorothea Bartels.

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Liu, SY., Xie, JG., Chen, XW. et al. Dunaliella Ds-26-16 acts as a global regulator to enhance salt tolerance by coordinating multiple responses in Arabidopsis seedlings. Planta 257, 110 (2023). https://doi.org/10.1007/s00425-023-04149-5

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  • DOI: https://doi.org/10.1007/s00425-023-04149-5

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