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Transcriptomics for Drought Stress Mediated by Biological Processes in-relation to Key Regulated Pathways in Gossypium darwinii

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Abstract

Background

Wild cotton Gossypium darwinii, an allotetraploid harbours important traits useful for tolerating abiotic stress, i.e., drought, salt and good genetic stability, hence these characteristics can be transferred to cultivated cotton for genetic improvement.

Materials and methods

In this study, we analyzed the RNA-seq transcriptomes from leaves of G. darwinii seedlings with and without drought stress. A total of 86.7 million valid reads with an average length of 95.79 bp were generated from the two samples and 58,960 transcripts with a length of more than 500 bp were assembled. We searched the known proteins on the strength of sequence similarity; these transcripts were annotated with COG, KEGG and GO functional categories. According to gene expression abundance RPKM value, we carried out RT-qPCR analysis to determine the expression pattern of the obtained transcription factors.

Results

A total of 58,960 genes was differentially expressed (DEG), with 32,693 and 25,919 genes found to be upregulated and downregulated, respectively. Through gene ontology and KEGG pathways, the upregulated genes were found to associate with all the GO terms, molecular functions (MF), biological process (BP) and cellular components (CC), which are highly linked to enhancing drought stress tolerance.

Conclusion

The study provides an in-depth knowledge of regulation of pathways and genes involved in photosynthesis during drought stress in G. darwinii. These pathways and genes were found to be significantly downregulated and this information could be further utilized by cotton breeders in developing a more drought tolerant cotton germplasm.

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Acknowledgements

We wish to thank Sangon Biotech (Shanghai) Co., Ltd. for help in sequencing, analysis support and assembly. Authors are thankful to Shahbaz Khan (Pakistan) for inputs regarding manuscript formatting according the journal pattern.

Funding

This program was financially sponsored by National Key R&D Program of China (2021YFE0101200), “Tianshan” Innovation team program of the Xinjiang Uygur Autonomous Region (2021D14007), Hunan Natural Science Foundation Youth Fund (2020JJ5291), “Huxiang Young Talents Plan” Support Project of Hunan Province (2019RS2048), State Key Laboratory of Cotton Biology Open Fund (CB2021A14).

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Authors

Contributions

HC, CX, MKI, ROM & FL designed the experiments. CX, HC, MKRK & HL conceived the experiments and analyzed the results. CX, HC, HL & MKRK carried out all computational analyses. KW, MKI, CX, ZZ, ZK, YL, FL, participated in part of experiments directly or indirectly contributed reagents/materials/analysis tools. HC, AG, DI, AJ, ROM, HL, MKRK, MKI, YL & FL drafted the manuscript and KW, AG, CX, ROM & FL proofread and ROM, MKI, DI & AG revised the manuscript. All authors read and approved the final manuscript.

Corresponding authors

Correspondence to Cuilian Xu, Abdul Ghafoor or Haodong Chen.

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The authors declare no conflict of interest.

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Authors declare that this study was conducted on wild cotton (Gossypium darwinii) crop, and no experimentations were conducted on human or animal subjects using research material during the current studies.

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Xu, C., Ilyas, M.K., Magwanga, R.O. et al. Transcriptomics for Drought Stress Mediated by Biological Processes in-relation to Key Regulated Pathways in Gossypium darwinii. Mol Biol Rep 49, 11341–11350 (2022). https://doi.org/10.1007/s11033-022-07774-7

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