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High light responses by isolates of Dunaliella reveals their potential for hyper-accumulation of carotenoids

High light responses by isolates of Dunaliella reveals their potential for hyper-accumulation of carotenoids

Xu, Yanan ORCID: 0000-0002-1697-6070, Ibrahim, Iskander M., Wosu, Chiziezi I., Rowden, Stephen J. L. and Harvey, Patricia ORCID: 0000-0001-7193-4570 (2017) High light responses by isolates of Dunaliella reveals their potential for hyper-accumulation of carotenoids. N/A. (Unpublished)

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The halotolerant microalgae Dunaliella salina and Dunaliella bardawil have been widely studied for natural β-carotene production. This work shows biochemical characterization of three newly isolated Dunaliella strains DF15, DF17 and DF40 compared with D. salina CCAP 19/30 and D. bardawil UTEX 2538. All strains exhibited photoprotection capacity and maintained a high rate of photosynthesis under high light stress, and all strains showed an overall increase in cellular content of carotenoids in response to increased light intensity. A major difference among the strains was their ability to accumulate high contents of individual carotenoids under high light stress. DF15 and UTEX 2538 accumulated more carotenoids, β-carotene in particular, than the other strains. DF15 but not UTEX 2538 accumulated a large amount of β-carotene under low light intensity. For all strains strong positive correlations were found between pairs of all-trans β-carotene, 9-cis β-carotene, all-trans α-carotene, zeaxanthin and total carotenoids. Lutein, however, was more closely correlated with dark respiration, photosynthesis and chlorophyll. Lutein has so far only been reported in association with photosynthesis in plants. Overall our data indicate that Dunaliella strains have coordinated universal photoprotection mechanisms for the maintenance of high photosynthetic efficiency under high light stress. The significance of these data for strain selection for commercial carotenoid production is discussed.

Item Type: Article
Additional Information: • Three new Dunaliella strains were compared with D. salina and D. bardawil. • A new Dunaliella isolate DF15 demonstrates hyper-accumulation of carotenoids • Photosynthesis was maintained with increased carotenoids under high light stress • -carotene, β-carotene and zeaxanthin were strongly positively correlated • Lutein content correlated closely with both dark respiration and photosynthesis
Uncontrolled Keywords: Dunaliella, Light intensity, Carotenoids, Hyper-accumulation, Correlations, New isolates
Subjects: Q Science > Q Science (General)
Faculty / School / Research Centre / Research Group: Faculty of Education, Health & Human Sciences
Faculty of Engineering & Science
Faculty of Education, Health & Human Sciences > Department of Psychology, Social Work & Counselling
Last Modified: 09 Oct 2021 04:45
Selected for GREAT 2016: None
Selected for GREAT 2017: GREAT a
Selected for GREAT 2018: None
Selected for GREAT 2019: None
Selected for REF2021: None

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