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miRNA Regulatory Networks Underlying the Root–Leaf Synergism in Salt Tolerant Pokkali Rice

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Abstract

Pokkali is one of the rice varieties that have adapted to grow under highly saline conditions. Several studies have shown that plant’s response to salt stress is a multigenic trait involving the coordinated action of signaling molecules, ion transporters, enzymes, and transcription factors. In earlier studies, we have reported that the adaptability of Pokkali rice to excess salt involves genetic regulations by a panel of microRNAs (miRNAs). The miRNAs are crucial primary regulators of gene expression that may act at the transcriptional or post-transcriptional levels in a sequence-specific manner. In this study, we have analyzed and compared the small RNA and transcriptome datasets of roots and leaves of Pokkali plants grown in the presence of salt. The expression profiles in the absence of salt, in both roots and leaves, were used for comparative controls. The miRNA nodes involved in root–leaf synergism were identified and validated. The analysis highlighted the role of osa-miR156a, osa-miR164a, osa-miR167a, osa-miR169a,b, osa-miR396a,b, osa-miR398b, and osa-miR399d. These miRNAs operated in stringently regulated genetic networks. The analysis also revealed that osa-miR167a and osa-miR399d are important part of synergistically interacting nodes to regulate growth of Pokkali plants in the presence of salt.

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Acknowledgements

KG received fellowship support from CSIR-HRDG. DM received fellowship support from the Department of Biotechnology, Government of India. SKS was supported by SERB Distinguished Fellowship.

Funding

The research was supported by financial grants to NSM received from the Department of Biotechnology, Government of India (BT/PR10071/AGR/36/31/2007 and BT/PR628/AGR/36/674/2011).

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Contributions

KG and AT contributed to methodology, data curation, analysis, and original draft preparation; DM contributed to the validation; BG contributed to the supervision; SS and NSM contributed to conceptualization, project administration, supervision, review, and editing. All the authors have read and approved the final manuscript.

Corresponding author

Correspondence to Neeti Sanan-Mishra.

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The authors declare no competing financial interests.

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Handling Editor: Padmanabh Dwivedi.

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Goswami, K., Mittal, D., Tripathi, A. et al. miRNA Regulatory Networks Underlying the Root–Leaf Synergism in Salt Tolerant Pokkali Rice. J Plant Growth Regul 42, 6183–6201 (2023). https://doi.org/10.1007/s00344-022-10801-3

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  • DOI: https://doi.org/10.1007/s00344-022-10801-3

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