Abstract
The induction of secondary metabolites under osmotic stress is well documented. However, cell death is probably due to osmotic stress. This work tries to study the synergetic effect of hydropriming and polyethylene glycol (PEG) on enhancing the secondary metabolites production in fenugreek callus cultures without facing cell death. PEG initiates the stress and the hydropriming increase the plant cell response against the stress. Fenugreek calli were initiated from hypocotyl of two groups of seeds, the first was hydroprimed overnight before germination, the second remained dry. Three months old calli of the two groups were subcultured on media containing two different concentration of PEG (5, 10%). The calli growth, biochemical analysis, secondary metabolism keys, and secondary metabolites were determined after 4 weeks. PE induced oxidative stress, which increased the membrane lipid peroxidation and decreased cell viability and growth. Hydropriming enhanced the activity of antioxidant enzymes, regulating the reactive oxygen species level, accumulating the osmolytes and secondary products. Therefore the primed callus can tolerate the osmotic stress initiated with PEG. Consequently, cell biomass increased and not affected by PEG treatment. On the other hand, the calli from non-primed seeds have a significant decrease in fresh weight, and dry weight under the higher PEG treatment. The hydropriming protected the growth of the cells under PEG treatment with a high content of secondary metabolites and high antioxidant machinery. The synergetic effect of hydropriming and PEG can be used as a simple and low-cost way to produce valuable compounds in commercial industrial bioreactors.
Key message
The synergetic effect of hydropriming and PEG enhances the secondary metabolites production in fenugreek callus. PEG initiates the stress and the hydropriming improves the plant cell response against the stress.
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Acknowledgements
Dr. Deyala M. Naguib would like to show her great gratitude to her supervisor Professor Hegazy Sadik Hegazy, professor of physiology, for his effort, time and patience giving to her in her life and work.
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Alzandi, A.A., Naguib, D.M. Effect of hydropriming on Trigonella foenum callus growth, biochemical traits and phytochemical components under PEG treatment. Plant Cell Tiss Organ Cult 141, 179–190 (2020). https://doi.org/10.1007/s11240-020-01778-6
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DOI: https://doi.org/10.1007/s11240-020-01778-6