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Discovering the regulators of heat stress tolerance in Ziziphus nummularia (Burm.f) wight and walk.-arn

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Abstract

Ziziphus nummularia an elite heat-stress tolerant shrub, grows in arid regions of desert. However, its molecular mechanism responsible for heat stress tolerance is unexplored. Therefore, we analysed whole transcriptome of Jaisalmer (heat tolerant) and Godhra (heat sensitive) genotypes of Z. nummularia to understand its molecular mechanism responsible for heat stress tolerance. De novo assembly of 16,22,25,052 clean reads yielded 276,029 transcripts. A total of 208,506 unigenes were identified which contains 4290 and 1043 differentially expressed genes (DEG) in TGO (treated Godhra at 42 °C) vs. CGO (control Godhra) and TJR (treated Jaisalmer at 42 °C) vs. CJR (control Jaisalmer), respectively. A total of 987 (67 highly enriched) and 754 (34 highly enriched) pathways were obsorved in CGO vs. TGO and CJR vs. TJR, respectively. Antioxidant pathways and TFs like Homeobox, HBP, ARR, PHD, GRAS, CPP, and E2FA were uniquely observed in Godhra genotype and SET domains were uniquely observed in Jaisalmer genotype. Further transposable elements were highly up-regulated in Godhra genotype but no activation in Jaisalmer genotype. A total of 43,093 and 39,278 simple sequence repeats were identified in the Godhra and Jaisalmer genotypes, respectively. A total of 10 DEGs linked to heat stress were validated in both genotypes for their expression under different heat stresses using quantitative real-time PCR. Comparing expression patterns of the selected DEGs identified ClpB1 as a potential candidate gene for heat tolerance in Z. nummularia. Here we present first characterized transcriptome of Z. nummularia in response to heat stress for the identification and characterization of heat stress-responsive genes.

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Acknowledgements

We sincerely acknowledge Director, ICAR–National Institute for Plant Biotechnology, New Delhi 110012, Delhi, India for providing support and facilities to carry out this research work. We also gratefully acknowledge the Director, ICAR-Indian Agricultural Research Institute (IARI) for providing National Phytotron Facility (NPF), Delhi 110012, India, for providing the plant growth chamber to conduct the research under controlled conditions. Fellowship received from Department of Biotechnology (DBT), Government of India by the first author is duly acknowledged.

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No external fund grant was received to carry out this work.

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JCP conceptualized and designed the study. KPP conducted the experiments, analysed and interpreted the results and wrote the manuscript under the supervision of JCP. KUT, DVP analyzed the data and edited the manuscript. KUT submitted the datasets to Sequence Read Archive (SRA) repository. RSJ involved manuscript editing. KG, MD, RR, MPS, OPA joined discussions regarding the experiments and data interpretations. All the authors read and approved the manuscript.

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Correspondence to Jasdeep Chatrath Padaria.

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The authors of this manuscript have no competing interests. The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.

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Panzade, K.P., Tribhuvan, K.U., Pawar, D.V. et al. Discovering the regulators of heat stress tolerance in Ziziphus nummularia (Burm.f) wight and walk.-arn. Physiol Mol Biol Plants 30, 497–511 (2024). https://doi.org/10.1007/s12298-024-01431-y

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  • DOI: https://doi.org/10.1007/s12298-024-01431-y

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