Carotenoids prevent different degenerative diseases and improve human health. Microalgae are commercially exploited for carotenoids, including astaxanthin and β-carotene. Two commercially important microalgae, Dunaliella salina and Tetraselmis suecica, were treated with plant hormones salicylic acid (SA) and methyl jasmonate (MJ), or by UV-C radiation (T. suecica only) and a combination thereof. Significant increases in total carotenoids were found for D. salina and T. suecica after treatment with MJ (10 μmol/L) and SA (70–250 μmol/L), respectively. T. suecica also had significant increases in total carotenoids following UV-C radiation compared to control cultures. Among the carotenoids, lutein was the highest induced carotenoid. A combination of these two treatments also showed a significant increase in total carotenoids and lutein for T. suecica, when compared to controls. Plant hormones and UV-C radiation may be useful tools for increasing carotenoid accumulation in green microalgae although the responses are species- and dose-specific and should be trialed in medium to large scale to explore commercial production.
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The authors wish to thank the Australian Research Council and Meat & Livestock Australia for financial support and Dr. Kalpesh Sharma for useful advice on UV-C treatments.
This study was funded by Meat and Livestock Australia (B.NBP.0695), the Australian Research Council (LP0990558), and an Australian Postgraduate Award (to FA).
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The authors declare that they have no conflict of interest.
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Ahmed, F., Fanning, K., Netzel, M. et al. Induced carotenoid accumulation in Dunaliella salina and Tetraselmis suecica by plant hormones and UV-C radiation. Appl Microbiol Biotechnol 99, 9407–9416 (2015). https://doi.org/10.1007/s00253-015-6792-x
- Methyl jasmonate
- Salicylic acid
- UV-C radiation