Synthesis of Antioxidant Carotenoids in Microalgae in Response to Physiological Stress

Faraloni, Cecilia; Torzillo, Giuseppe

doi:10.5772/67843

Cited by 34 publications

(28 citation statements)

References 45 publications

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“…Three main groups of pigments participate in light harvesting for photosynthesis: chlorophylls, carotenoids and phycobilins. Some carotenoids have a protective role against photodamage in high light intensities, by selectively quenching chl a triplet state and thus preventing the formation of singlet oxygen, which is a harmful reactive oxygen species (Faraloni and Torzillo 2017;Koyama et al 1996).…”

Section: Absorption By Pigmentsmentioning

confidence: 99%

Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes

Lehmuskero

Chauton

Boström

2018

Progress in Oceanography

105

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Section: Absorption By Pigmentsmentioning

confidence: 99%

Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes

Lehmuskero

Chauton

Boström

2018

Progress in Oceanography

105

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“…Reduction of photosynthetic electrons transport may be associated with the formation of free radicals and singlet oxygen. In order to prevent damage from photooxidation, microalgae are able to synthesize a large amount of carotenoids, which can deactivate these dangerous oxidant molecules 29 .…”

Section: Resultsmentioning

confidence: 99%

Optimised spectral effects of programmable LED arrays (PLA)s on bioelectricity generation from algal-biophotovoltaic devices

Phang

Lan

et al. 2020

Sci Rep

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The biophotovoltaic cell (BPV) is deemed to be a potent green energy device as it demonstrates the generation of renewable energy from microalgae; however, inadequate electron generation from microalgae is a significant impediment for functional employment of these cells. The photosynthetic process is not only affected by the temperature, CO2 concentration and light intensity but also the spectrum of light. Thus, a detailed understanding of the influences of light spectrum is essential. Accordingly, we developed spectrally optimized light using programmable LED arrays (PLA)s to study the effect on algae growth and bioelectricity generation. Chlorella is a green microalga and contains chlorophyll-a (chl-a), which is the major light harvesting pigment that absorbs light in the blue and red spectrum. In this study, Chlorella is grown under a PLA which can optimally simulate the absorption spectrum of the pigments in Chlorella. This experiment investigated the growth, photosynthetic performance and bioelectricity generation of Chlorella when exposed to an optimally-tuned light spectrum. The algal BPV performed better under PLA with a peak power output of 0.581 mW m−2 for immobilized BPV device on day 8, which is an increase of 188% compared to operation under a conventional white LED light source. The photosynthetic performance, as measured using pulse amplitude modulation (PAM) fluorometry, showed that the optimized spectrum from the PLA gave an increase of 72% in the rETRmax value (190.5 μmol electrons m−2 s−1), compared with the conventional white light source. Highest algal biomass (1100 mg L−1) was achieved in the immobilized system on day eight, which translates to a carbon fixation of 550 mg carbon L−1. When artificial light is used for the BPV system, it should be optimized with the light spectrum and intensity best suited to the absorption capability of the pigments in the cells. Optimum artificial light source with algal BPV device can be integrated into a power management system for low power application (eg. environment sensor for indoor agriculture system).

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“…Here, D . salina was first able to grow exponentially in its motile stage, later entering a stationary phase in which cells started to produce orange/red carotenoids (reported as a stress marker; Teodoresco 1905 , Faraloni and Torzillo 2017 ). These cells then formed clumps that could be indicative of the palmella stage, also an indication of stress in Dunaliella species.…”

Section: Resultsmentioning

confidence: 99%

The beauty and the yeast: can the microalgae Dunaliella form a borderline lichen with Hortaea werneckii?

et al. 2020

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Lichenized fungi usually develop complex, stratified morphologies through an intricately balanced living together with their algal partners, but several species are known to form only more or less loose associations with algae. These borderline lichens are still little explored although they could inform us about early stages of lichen evolution. We studied the association of the extremely halotolerant fungus Hortaea werneckii with the alga Dunaliella atacamensis, discovered in a cave in the Atacama Desert (Chile), and with D. salina, common inhabitant of saltern brines. D. atacamensis forms small colonies, in which cells of H. werneckii can be frequently observed, while such interaction has not been observed with D. salina. As symbiotic interactions between Dunaliella and Hortaea have not been reported, we performed a series of co-cultivation experiments to inspect whether these species could interact and develop more distinct lichen-like symbiotic structures. We set up co-cultures between axenic strains of Hortaea werneckii (isolated both from Mediterranean salterns and from the Atacama cave) and isolates of D. atacamensis (from the Atacama cave) and D. salina (isolated from Mediterranean salterns). Although we used different growth media and cultivation approaches, bright field and SEM microscopy analyses did not indicate any mutual effects in these experiments. We discuss the implications for fungal algal interactions along the transition from algal exploiters to lichen symbioses.

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Synthesis of Antioxidant Carotenoids in Microalgae in Response to Physiological Stress

Cited by 34 publications

References 45 publications

Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes

Light and photosynthetic microalgae: A review of cellular- and molecular-scale optical processes

Optimised spectral effects of programmable LED arrays (PLA)s on bioelectricity generation from algal-biophotovoltaic devices

The beauty and the yeast: can the microalgae Dunaliella form a borderline lichen with Hortaea werneckii?

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