Abstract
Background of the study
Digitalis purpurea (L) is an important medicinal plant growing at Alpine region of Himalayas and withstands low temperatures and harsh climatic conditions existing at high altitude. It serves as an ideal plant system to decipher the tolerance to cold stress (CS) in plants from high altitudes.
Methods and results
To understand the complexity of plant response to CS, we performed a comparative physiological and biochemical study complemented with proteomics in one-month-old D. purpurea grown at 25 °C (control) and 4 °C (CS). We observed an enhanced accumulation of different osmo-protectants (glycine betaine, soluble sugar and proline) and higher transcription (mRNA levels) of various antioxidant enzymes with an increased antioxidant enzyme activity in D. purpurea when exposed to CS. Furthermore, higher concentrations of non-enzymatic antioxidants (flavonoids, phenolics) was also associated with the response to CS. Differential proteomic analysis revealed the role of various proteins primarily involved in redox reactions, protein stabilization, quinone and sterol metabolism involved in CS response in D. purpurea..
Conclusion
Our results provide a framework for better understanding the physiological and molecular mechanism of CS response in D. purpurea at high altitudes.
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Acknowledgements
The authors are grateful for their financial support from the Research Science and Engineering Board (SERB), Department of Science and Technology, India (No: YSS/2015/000364) and SB/SO/BB/066/2013. NJ acknowledges funding by DST (SR/WOS-A/LS-85/2016).
Funding
This article was funded by DST, SR/WOS-A/LS-85/2016, Nelofer Jan, SERB, YSS/2015/000364, Hilal Ahmad Qazi.
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NJ and MAW did protein isolation and proteomic analysis; UMW did the real time analysis; HAQ did the physiology work; RJ conceived the idea, supervised the work and edited and finalized the manuscript.
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Jan, N., Wani, U.M., Wani, M.A. et al. Comparative physiological, antioxidant and proteomic investigation reveal robust response to cold stress in Digitalis purpurea L. Mol Biol Rep 50, 7319–7331 (2023). https://doi.org/10.1007/s11033-023-08635-7
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DOI: https://doi.org/10.1007/s11033-023-08635-7