The metabolic survival strategy of marine macroalga Ulva prolifera under temperature stress

He, Yanli; Hu, Chaoyang; Wang, Yanhui; Cui, Dandan; Sun, Xue; Li, Yahe; Xu, Nianjun

doi:10.1007/s10811-018-1493-3

Cited by 29 publications

(10 citation statements)

References 42 publications

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“…That elevated temperature has a positive effect on the carbohydrate content in Ulva spp. is supported by previous studies (Mohsen et al 1973b;Wang et al 2007;He et al 2018). As for irradiance, Mohsen et al (1973a) found that the correlation to carbohydrates is not strictly positive or negative but different for the different carbohydrate components, as was also the case for the monosaccharides in this study.…”

Section: Discussionsupporting

confidence: 91%

“…The impact of some abiotic cultivation factors (temperature, illumination, nutrients, and pCO 2 ) on the carbohydrate composition of Ulva spp. has been investigated previously (Mohsen et al 1973a,;1973b;Gómez Pinchetti et al 1998;Wang et al 2007;Kumari et al 2014;Gao et al 2017Gao et al , 2018He et al 2018;Chen et al 2019). However, the total carbohydrate content is sometimes calculated by taking the difference between total weight and other biochemical components, e.g., (Gao et al 2017(Gao et al , 2018, and when carbohydrates are measured directly the resolution is often poor, e.g., (Mohsen et al 1973a(Mohsen et al , 1973bGómez Pinchetti et al 1998;Kumari et al 2014;Chen et al 2019).…”

Section: Introductionmentioning

confidence: 99%

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Cultivation conditions affect the monosaccharide composition in Ulva fenestrata

et al. 2020

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In recent years, the interest in using seaweed for the sustainable production of commodities has been increasing as seaweeds contain many potentially worthwhile compounds. Thus, the extraction and refining processes of interesting compounds from seaweeds is a hot research topic but has been found to have problems with profitability for novel applications. To increase the economic potential of refining seaweed biomass, the content of the compounds of interest should be maximized, which can potentially be achieved through optimization of cultivation conditions. In this study, we studied how the monosaccharide composition of the green seaweed species Ulva fenestrata is influenced by the abiotic factors; irradiance, temperature, nitrate, phosphate, and pCO2. It was evident that lower nitrate concentration and cultivation at elevated temperature increased monosaccharide contents. A 70% increase in iduronic acid and a 26% increase in rhamnose content were seen under elevated irradiance and temperature conditions, though the absolute differences in monosaccharide concentration were small. Irradiance and nitrate impacted the ratio between iduronic and rhamnose, which is an indicator of the ulvan structure. These results could potentially be utilized to coax the ulvan towards specific bioactivities, and thus have a considerable impact on a potential biorefinery centered around Ulva.

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Section: Discussionsupporting

confidence: 91%

Section: Introductionmentioning

confidence: 99%

Cultivation conditions affect the monosaccharide composition in Ulva fenestrata

et al. 2020

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“…Notably, our data showed a tendency of increased carbohydrates when lower temperatures and low densities were applied during the hatchery phase. Even though the measured effect size was relatively low, our data contradict what has been reported previously; there was a positive effect of elevated temperature on the total carbohydrate composition [37,69], whereas raised nutrient levels resulted in deceased total carbohydrate contents [37,70].…”

Section: Carbohydratescontrasting

confidence: 90%

Sustainable Large-Scale Aquaculture of the Northern Hemisphere Sea Lettuce, Ulva fenestrata, in an Off-Shore Seafarm

Steinhagen

Enge

Larsson

et al. 2021

JMSE

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The growing world population demands an increase in sustainable resources for biorefining. The opening of new farm grounds and the cultivation of extractive species, such as marine seaweeds, increases worldwide, aiming to provide renewable biomass for food and non-food applications. The potential for European large-scale open ocean farming of the commercial green seaweed crop Ulva is not yet fully realized. Here we conducted manipulative cultivation experiments in order to investigate the effects of hatchery temperature (10 and 15 °C), nutrient addition (PES and 3xPES) and swarmer density (500 and 10,000 swarmers ml−1) on the biomass yield and biochemical composition (fatty acid, protein, carbohydrate, pigment and phenolic content) of off-shore cultivated Ulva fenestrata in a Swedish seafarm. High seedling densities were optimal for the growth of this northern hemisphere crop strain and significantly increased the mean biomass yield by ~84% compared to low seedling densities. Variations of nutrients or changes in temperature levels during the hatchery phase were not necessary to increase the subsequent growth in an open-water seafarm, however effects of the factors on the thallus habitus (thallus length/width) were observed. We found no significant effect of the environmental factors applied in the hatchery on the total fatty acid or crude protein content in the off-shore cultivated Ulva. However, low seedling density and low temperature increased the total carbohydrate content and furthermore, high temperature in combination with high nutrient levels decreased the pigment content (chlorophyll a, b, carotenoids). Low temperature in combination with high nutrient levels increased the phenolic content. Our study confirms the successful and sustainable potential for large-scale off-shore cultivation of the Scandinavian crop U. fenestrata. We conclude that high seedling density in the hatchery is most important for increasing the total biomass yield of sea-farmed U. fenestrata, and that changing temperature or addition of nutrients overall does not have a large effect on the biochemical composition. To summarize, our study contributes novel insights into the large-scale off-shore cultivation potential of northern hemisphere U. fenestrata and underpins suitable pre-treatments during the hatchery phase of seedlings to facilitate a successful and cost-efficient large-scale rope cultivation.

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“…In their respective sampling sites, U. intestinalis were mostly found free-floating or attached to seagrass leaf blades or mangrove roots and directly exposed to sunlight and heat at low tide, while P. boryana remained attached to the substrate, forming assemblage structure, which may buffer drastic changes in environmental factors influenced by tidal cycle. Underlying mechanisms of heat tolerance in Ulva species have been extensively studied and vast arrays of molecular regulations and metabolic adjustment pathways have been identified (Fan et al, 2017;He et al, 2018). Previous studies also provide evidence that calcified macroalgae are more negatively affected by warming than fleshy macroalgae (Kram et al, 2016;Dove et al, 2020), partly due to the sensitivity of the calcification process to heat (Sinutok et al, 2011(Sinutok et al, , 2012.…”

Section: Differences In Sensitivity To Warming Among Important Groups Of Tropical Marine Organisms and Species And Its Ecological Relevanmentioning

confidence: 99%

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

et al. 2021

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Tropical shallow-water habitats represent the marine environments with the greatest biodiversity; however, these habitats are the most vulnerable to climate warming. Corals, seagrasses, and macroalgae play a crucial role in the structure, functions, and processes of the coastal ecosystems. Understanding their growth and physiological responses to elevated temperature and interspecific sensitivity is a necessary step to predict the fate of future coastal community. Six species representatives, including Pocillopora acuta, Porites lutea, Halophila ovalis, Thalassia hemprichii, Padina boryana, and Ulva intestinalis, collected from Phuket, Thailand, were subjected to stress manipulation for 5 days. Corals were tested at 27, 29.5, 32, and 34.5°C, while seagrasses and macroalgae were tested at 27, 32, 37, and 42°C. After the stress period, the species were allowed to recover for 5 days at 27°C for corals and 32°C for seagrasses and macroalgae. Non-destructive evaluation of photosynthetic parameters (Fv/Fm, Fv/F0, ϕPSII and rapid light curves) was carried out on days 0, 3, 5, 6, 8, and 10. Chlorophyll contents and growth rates were quantified at the end of stress, and recovery periods. An integrated biomarker response (IBR) approach was adopted to integrate the candidate responses (Fv/Fm, chlorophyll content, and growth rate) and quantify the overall temperature effects. Elevated temperatures were found to affect photosynthesis, chlorophyll content, and growth rates of all species. Lethal effects were detected at 34.5°C in corals, whereas adverse but recoverable effects were detected at 32°C. Seagrasses and macroalgae displayed a rapid decline in photosynthesis and lethal effects at 42°C. In some species, sublethal stress manifested as slower growth and lower chlorophyll content at 37°C, while photosynthesis remained unaffected. Among all, T. hemprichii displayed the highest thermotolerance. IBR provided evidence that elevated temperature affected the overall performance of all tested species, depending on temperature level. Our findings show a sensitivity that differs among important groups of tropical marine organisms inhabiting the same shallow-water environments and highlights the importance of integrating biomarkers across biological levels to assess their vulnerability to climate warming.

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The metabolic survival strategy of marine macroalga Ulva prolifera under temperature stress

Cited by 29 publications

References 42 publications

Cultivation conditions affect the monosaccharide composition in Ulva fenestrata

Cultivation conditions affect the monosaccharide composition in Ulva fenestrata

Sustainable Large-Scale Aquaculture of the Northern Hemisphere Sea Lettuce, Ulva fenestrata, in an Off-Shore Seafarm

Experimental Assessment of Vulnerability to Warming in Tropical Shallow-Water Marine Organisms

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