Lipid dynamics and nutritional value of the estuarine strain Isochrysis galbana VLP grown from hypo to hyper salinity

Cañavate, José Pedro; Hachero‐Cruzado, Ismael; Pérez-Gavilán, Carmen; Fernández‐Díaz, Catalina

doi:10.1007/s10811-020-02258-2

Cited by 11 publications

(22 citation statements)

References 90 publications

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“…119 TG also decreased with salinity in cultures of the estuarine haptophyte Isochrysis galbana VLP. 21 In Eustigmatophyceae species, TG was higher in N. oceanica grown in seawater at 27 g l −1 NaCl compared with a NaCl-free medium. 66 Neutral lipids also increased with higher salinities in N. salina 15 and Microchloropsis gaditana, 67 although in both cases the main effect was attributed to severe growth restriction.…”

Section: Con S Ider Ati On Sonthe Rel Ati On S Hipb E T Weensalinit Yand Tri G Lyceridecontentmentioning

confidence: 95%

“…A similar lipid decrease with salinity was found in the chlorophyte Picochlorum, 12,84 the eustigmatophyte Nannochloropsis oculata 34 and a Synechococcus strain isolated from a hypersaline environment that exhibited maximum lipid content when grown in freshwater, with a gradual lipid decrease as salinity increased to 100 psu. 85 Total lipid also decreased with salinity in the haptophytes Isochrysis spp 21,86 and D. vlkianum VLP (Cañavate and Fernández-Díaz unpublished data). Contrasting results were described in other haptophyte strains, as total lipid increased within a salinity range below that of seawater in Isochrysis galbana T-ISO 34 and P. lutheri.…”

Section: Theinter Ac Tingeffec Tof Salinit Yandculturecond Iti On Son Lipidcontentinmi Croalg Aementioning

confidence: 96%

“…47 Among few studies available, chlorophyll a has been found to decrease with salt stress in freshwater microalgae 2,48 and in marine species. 9,21,44 However, this does not appear to be a widespread trait among all microalgae, as chlorophyll a increased with salinity in the cyanobacterium Synechocystis 49 and the halophile Dunaliellla salina. 50 Recent results show that chlorophyll a is maximum and change little within the optimum growth salinity range of microalgae.…”

Section: Theinter Ac Tingeffec Tof Salinit Yandculturecond Iti On Son Lipidcontentinmi Croalg Aementioning

confidence: 99%

“…19 In addition, salinity can select for species with different nutritional values within the phytoplankton community 20 and can also modify nutritional value intra-specifically. 21 To adequately develop the potential of salinity in microalgal production, a deeper knowledge on salt physiology and biochemistry is needed. Differentiating salinity response between marine and freshwater phylogenetic counterparts within the microalgal domain is particularly interesting to both optimize production systems and better understand the transition events that occurred between marine and freshwater environments through evolution of microalgae.…”

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confidence: 99%

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An appraisal of the variable response of microalgal lipids to culture salinity

Cañavate

Fernández‐Díaz

2021

Reviews in Aquaculture

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Salinity is an important factor in microalgal mass production that has been less studied than other external factors such as temperature and irradiance. The greater attention paid to the effects of these two factors reflects the important influence that both exert on growth and production of microalgae. 1 However, the ability to control the effects of temperature and irradiance on microalgal production is inversely proportional to the size of the culture system. This especially affects outdoor mass production systems, under which conditions the options for regulating the effects of temperature and irradiance are very limited. Therefore, lower-cost outdoor open production systems are highly dependent on how environmental factors change. In this type of system, salinity takes on a key role as an easier factor to handle to optimize production. Production of freshwater microalgae at higher salinity is possible thanks to the availability of several salttolerant species. [2][3][4][5] Microalgal production in environments of variable salinity may be even more feasible if not only estuarine species

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Section: Con S Ider Ati On Sonthe Rel Ati On S Hipb E T Weensalinit Yand Tri G Lyceridecontentmentioning

confidence: 95%

Section: Theinter Ac Tingeffec Tof Salinit Yandculturecond Iti On Son Lipidcontentinmi Croalg Aementioning

confidence: 96%

Section: Theinter Ac Tingeffec Tof Salinit Yandculturecond Iti On Son Lipidcontentinmi Croalg Aementioning

confidence: 99%

mentioning

confidence: 99%

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An appraisal of the variable response of microalgal lipids to culture salinity

Cañavate

Fernández‐Díaz

2021

Reviews in Aquaculture

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“…The number of double bonds vary from 2-4 and the level of unsaturation is known to be linked to the water temperature, with higher temperatures favouring the synthesis of more saturated species. In Isochrysis galbana, under conditions aimed to stimulate lipid accumulation, the alga accumulated 29% of the dry weight as these products [120]. The high melting points (~70 • C) make alkenones unsuitable for biodiesel production.…”

Section: Alkenonesmentioning

confidence: 99%

Key Targets for Improving Algal Biofuel Production

et al. 2021

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A number of technological challenges need to be overcome if algae are to be utilized for commercial fuel production. Current economic assessment is largely based on laboratory scale up or commercial systems geared to the production of high value products, since no industrial scale plant exits that are dedicated to algal biofuel. For macroalgae (‘seaweeds’), the most promising processes are anaerobic digestion for biomethane production and fermentation for bioethanol, the latter with levels exceeding those from sugar cane. Currently, both processes could be enhanced by increasing the rate of degradation of the complex polysaccharide cell walls to generate fermentable sugars using specifically tailored hydrolytic enzymes. For microalgal biofuel production, open raceway ponds are more cost-effective than photobioreactors, with CO2 and harvesting/dewatering costs estimated to be ~50% and up to 15% of total costs, respectively. These costs need to be reduced by an order of magnitude if algal biodiesel is to compete with petroleum. Improved economics could be achieved by using a low-cost water supply supplemented with high glucose and nutrients from food grade industrial wastewater and using more efficient flocculation methods and CO2 from power plants. Solar radiation of not <3000 h·yr−1 favours production sites 30° north or south of the equator and should use marginal land with flat topography near oceans. Possible geographical sites are discussed. In terms of biomass conversion, advances in wet technologies such as hydrothermal liquefaction, anaerobic digestion, and transesterification for algal biodiesel are presented and how these can be integrated into a biorefinery are discussed.

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Hyposalinity induces significant polar lipid remodeling in the marine microalga Dunaliella tertiolecta (Chlorophyceae)

et al. 2022

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Marine microalgae often live in a fluctuating environment including a decrease in salinity caused by global warming induced sea ice melting and freshwater inflows. Under conditions of fluctuating salinity, microalgae have evolved a variety of survival mechanisms such as lipid accumulation and remodeling. The purpose of this study was to investigated the membrane lipid remodeling of the marine green microalga Dunaliella tertiolecta as a short-term acclimation mechanism in response to hyposalinity (20 and 3 PSU) with respect to growth at optimal salinity (38 PSU). We identified 34 lipid species belonging to seven polar lipid classes. Dunaliella tertiolecta accumulates cell lipids and remodels polar lipid classes and their fatty acids composition as response to hypoosmotic stress at 3 PSU. We found that the unsaturation of most polar lipids decreases overall, indicating decreased membrane fluidity and altered permeability, whereas shortening the length of fatty acids of polar lipids is not one of the strategies of D. tertiolecta to cope with the decrease in salinity. Increase in relative content (%) and unsaturation of monogalactosyldiacylglycerols (MGDG) and decrease in relative content (%) and unsaturation of phosphatidylglycerols (PG), suggesting changes in photosynthetic membranes of thylakoids at 20 and 3 PSU. At a very low salinity of 3 PSU, the relative content (%) of phosphatidylinositols (PI) increases, suggesting increased lipid trafficking and signaling in the cells. These changes are statistically significant and we hypothesize that D. tertiolecta is genetically adapted to withstand large salinity fluctuations through polar lipid composition.

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Lipid dynamics and nutritional value of the estuarine strain Isochrysis galbana VLP grown from hypo to hyper salinity

Cited by 11 publications

References 90 publications

An appraisal of the variable response of microalgal lipids to culture salinity

An appraisal of the variable response of microalgal lipids to culture salinity

Key Targets for Improving Algal Biofuel Production

Hyposalinity induces significant polar lipid remodeling in the marine microalga Dunaliella tertiolecta (Chlorophyceae)

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