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Comparison of tolerant and susceptible cultivars revealed the roles of circular RNAs in rice responding to salt stress

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Abstract

As a newly characterized class of noncoding RNAs, circular RNAs (circRNAs) have been identified in many plant species, and play important roles in plant stress responses. However, little is known about how salt stress mediates the expression of circRNAs in rice. In this study, we identified circRNAs from root tissues of salt-susceptible recipient cultivar 93–11 and salt-tolerant introgression line 9L136. A total of 190 circRNAs were identified. Among them, 93 circRNAs were differentially expressed under salt stress in 93–11 (36 up- and 57 down-regulated) and 95 in 9L136 (46 up- and 49 down-regulated). Salt stress significantly decreased the average expression level of circRNAs in 93–11, but circRNA expression levels were slightly increased in 9L136, suggesting that circRNAs had different response patterns in these two cultivars. Function annotation and enrichment analysis indicated that, through cis-regulation and circRNA-miRNA-mRNA network regulation, those induced circRNAs were commonly involved in transcription, signal transduction, ion transportation, and secondary metabolism. Compared to 93–11, salt-induced circRNAs in line 9L136 targeted more stress response genes participating in transcription regulation, ion transportation, and signal transduction, which may contribute to the salt tolerance of 9L136. Summarily, this study revealed the common response of rice circRNAs to salt stress, and the possible circRNA-related salt tolerance mechanisms of 9L136.

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Data Availability

All data generated or analyzed during this study are included in this published article and its supplementary information files. The datasets generated and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

We thank LetPub (www.letpub.com) for its linguistic assistance during the preparation of this manuscript.

Funding

This work was partially supported by the Open Project Program of Hubei Key Laboratory of Food Crop Germplasm and Genetic Improvement (2019lzjj03), the Open Project Program of Key Laboratory of Integrated Pest Management of Crops in Central China, Ministry of Agriculture/Hubei Key Laboratory of Crop Diseases, Insect Pests and Weeds Control (2019ZTSJJ8).

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J.L. Y., Y.K. L., L. L., and J. Z. conceived the study, designed the experiments, and analyzed data. J.L. Y. wrote the first draft, S.Y. C. and B.T. W. finalized the manuscript. All the authors read the manuscript.

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Correspondence to Junliang Yin, Shaoyu Chen or Baotong Wang.

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The authors declare that they have no conflict of interest.

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Communicated by Fei Dai.

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Supplementary Information

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10725_2021_772_MOESM1_ESM.xlsx

Supplementary file1 Supplementary Table 1. Genome-wide identification of circRNAs in recipient 93-11 and introgression line 9L136. Supplementary Table 2. Detailed information of identified circRNAs in rice. Supplementary Table 3. Salt induced differentially expressed circRNAs and annotations in 93-11. Supplementary Table 4. Salt induced differentially expressed circRNAs and annotations in 9L136. Supplementary Table 5. Detailed information of miRNA sponged by circRNAs and their mRNA targets in 93-11. Supplementary Table 6. Function annotations of mRNAs targeted by miRNAs in 93-11. Supplementary Table 7. Detailed information of miRNA sponged by circRNAs and their mRNA targets in 9L136. Supplementary Table 8. Function annotations of mRNAs targeted by miRNAs in 9L136. Supplementary Table 9. Primers used for circRNAs sequences validation. (XLSX 153 KB)

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Yin, J., Liu, Y., Lu, L. et al. Comparison of tolerant and susceptible cultivars revealed the roles of circular RNAs in rice responding to salt stress. Plant Growth Regul 96, 243–254 (2022). https://doi.org/10.1007/s10725-021-00772-y

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  • DOI: https://doi.org/10.1007/s10725-021-00772-y

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