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The comparative transcriptome analysis of two green super rice genotypes with varying tolerance to salt stress

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Abstract

Background

Salinity is one of the main abiotic factors that restrict plant growth, physiology, and crop productivity is salt stress. About 33% of the total irrigated land suffers from severe salinity because of intensive underground water extraction and irrigation with brackish water. Thus, it is important to understand the genetic mechanism and identify the novel genes involved in salt tolerance for the development of climate-resilient rice cultivars.

Methods and results

In this study, two rice genotypes with varying tolerance to salt stress were used to investigate the differential expressed genes and molecular pathways to adapt under saline soil by comparative RNA sequencing at 42 days of the seedling stage. Salt-susceptible (S3) and -tolerant (S13) genotypes revealed 3982 and 3463 differentially expressed genes in S3 and S13 genotypes. The up-regulated genes in both genotypes were substantially enriched in different metabolic processes and binding activities. Biosynthesis of secondary metabolites, phenylpropanoid biosynthesis, and plant signal transduction mechanisms were highly enriched. Salt-susceptible and -tolerant genotypes shared the same salt adaptability mechanism with no significant quantitative differences at the transcriptome level. Moreover, bHLH, ERF, NAC, WRKY, and MYB transcription factors were substantially up-regulated under salt stress. 391 out of 1806 identified novel genes involved in signal transduction mechanisms. Expression profiling of six novel genes further validated the findings from RNA-seq data.

Conclusion

These findings suggest that the differentially expressed genes and molecular mechanisms involved in salt stress adaptation are conserved in both salt-susceptible and salt-tolerant rice genotypes. Further molecular characterization of novel genes will help to understand the genetic mechanism underlying salt tolerance in rice.

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Data availability

The RNA-seq dataset generated and analyzed in the present study is submitted in NCBI GEO under the accession GSE210952.

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Acknowledgements

The authors extend their appreciation to the Researchers Supporting Project number (RSP-2024R369), King Saud University, Riyadh, Saudi Arabia. We are also thankful to the Bioinformatics and Functional Genomics Labs at the National Institute for Genomics and Advanced Biotechnology (NIGAB), Pakistan, for providing the research facilities.

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No specific funds have been received for this study.

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Authors

Contributions

Conceptualization, NZ, and MRK; methodology, software, and validation, IUZ, UF, MKN, SI, NR, and MU; formal analysis and investigation, NZ, and MU; writing—original draft preparation, review, and editing, NZ, MU, GMA, SF, RMA, JX, ZL, and MRK; visualization, MU; supervision and funding acquisition, MRK. All authors have read and agreed to the published version of the manuscript.

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Correspondence to Sajid Fiaz or Muhammad Ramzan Khan.

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Zahra, N., Uzair, M., Zaid, I.U. et al. The comparative transcriptome analysis of two green super rice genotypes with varying tolerance to salt stress. Mol Biol Rep 51, 22 (2024). https://doi.org/10.1007/s11033-023-08998-x

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