Effects of salinity stress on the growth and chlorophyll fluorescence of <i>Phaeodactylum tricornutum</i> and <i>Chaetoceros gracilis</i> (Bacillariophyceae)

Liang, Ying; Sun, Minghui; Chen, Tian; Chunhui, Cao; Li, Zebang

doi:10.1515/bot-2014-0037

Cited by 32 publications

(17 citation statements)

References 22 publications

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“…The optimum temperature when considering fucoxanthin productivity was found at around 21-22°C. Previous studies showed that the optimum temperature for biomass production of P. tricornutum was 21.5°C, at a salinity range between 20 and 30 psu (Yongmanitchai and Ward 1991;Liang et al 2014), which is in agreement with our results. Furthermore, the optimal urea addition was found at around 80-85 mg L −1 .…”

Section: Discussionsupporting

confidence: 93%

Environmental and nutrient conditions influence fucoxanthin productivity of the marine diatom Phaeodactylum tricornutum grown on palm oil mill effluent

et al. 2018

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Palm oil mill effluent (POME) is a type of wastewater posing large problems when discharged in the environment. Yet, due to its high nutrient content, POME may offer opportunities for algal growth and subsequent harvesting of high-value products. The marine diatom Phaeodactylum tricornutum is a potential feedstock diatom for bioactive compounds such as the carotenoid fucoxanthin, which has been shown to have pharmaceutical applications. The aim of this paper was to evaluate the growth and fucoxanthin productivity of P. tricornutum grown on POME, as a function of light intensity, temperature, salinity, and nutrient enrichment. High-saturating irradiance (300 μmol photons m −2 s −1) levels at 25°C showed highest growth rates but decreased the fucoxanthin productivity of P. tricornutum. Box-Behnken response surface methodology revealed that the optimum fucoxanthin productivity was influenced by temperature, salinity, and the addition of urea. Nutrient enrichment by phosphorus did not enhance cell density and fucoxanthin productivity, while urea addition was found to stimulate both. We conclude that POME wastewater, supplemented with urea, can be considered as the potential medium for P. tricornutum to replace commercial nutrients while producing high amounts of fucoxanthin.

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Section: Discussionsupporting

confidence: 93%

Environmental and nutrient conditions influence fucoxanthin productivity of the marine diatom Phaeodactylum tricornutum grown on palm oil mill effluent

et al. 2018

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“…Franklin et al [11] recorded the toxic sequence as Cu>Cd>Zn for Chlorella sp. while Liang et al [12] reported the sequence as Cd>Cu>Zn for Phaeodactylum tricornutum. Obviously, the toxic rank for different metals is not static and depends on the species of algae.…”

Section: Effects Of Five Metals On the Growthmentioning

confidence: 99%

Effects of five heavy metals at sub-lethal concentrations on the growth and photosynthesis of Chlorella vulgaris

Ouyang

Kong

et al. 2012

Chin. Sci. Bull.

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The impact of sub-lethal concentrations (0.05, 0.5, 5 μmol L −1 ) of the heavy metals copper (Cu), chromium (Cr), zinc (Zn), cadmium (Cd) and lead (Pb) on the growth and photosynthesis of Chlorella vulgaris was studied during 96 h exposure experiments. The results showed that the effects of these five metals on the growth of Chlorella vulgaris were dependent on both concentration and exposure time. It was found that 5 μmol L −1 treatments of Cu, Cr, Zn, Cd and Pb significantly inhibited the growth of Chlorella vulgaris, and the effect became weaker with an increase in exposure duration. Different effects on chlorophyll fluorescence were found for different metals, with Cu and Cr having an inhibiting effect and Zn and Cd having a promoting effect. The effects of heavy metals upon the growth and photosynthesis of Chlorella vulgaris were independent of each other and not causally related.heavy metal, sub-lethal, Chlorella vulgaris, growth, photosynthesis Citation:Ouyang H L, Kong X Z, He W, et al. Effects of five heavy metals at sub-lethal concentrations on the growth and photosynthesis of Chlorella vulgaris.

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“…Among thousands of diatom species, the marine centric diatom C. gracilis is considered an ideal species for shrimp larviculture owing to its nutritional content and size as well as its ability to be cultivated on an industrial scale [70]. There is also existing knowledge of its physiological characteristics regarding photosynthesis and oil production [34, 38, 72, 73]. Furthermore, we recently established a stable and efficient genetic transformation technique for C. gracilis [74].…”

Section: Introductionmentioning

confidence: 99%

Advantageous characteristics of the diatom Chaetoceros gracilis as a sustainable biofuel producer

Tokushima

Inoue-Kashino

Nakazato

et al. 2016

Biotechnol Biofuels

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BackgroundDiatoms have attracted interest as biofuel producers. Here, the contents of lipids and photosynthetic pigments were analyzed in a marine centric diatom, Chaetoceros gracilis. This diatom can be genetically engineered using our previously reported transformation technique and has a potential to produce valuable materials photosynthetically. Sustainable culture conditions for cost-effective production of biological materials under autotrophic conditions with atmospheric carbon dioxide were investigated in the laboratory. A large-scale, open-air culture was also performed.ResultsCell population doubling time was ~10 h under continuous illumination without CO2 enrichment, and large amounts of triacylglycerols (TAG) and fucoxanthin accumulated under a wide range of salinity and nutrient conditions, reaching ~200 and 18.5 mg/L, respectively. It was also shown that C. gracilis produced high amounts of TAG without the need for nitrogen or silica deprivation, which is frequently imposed to induce lipid production in many other microalgae. Furthermore, C. gracilis was confirmed to be highly tolerant to changes in environmental conditions, such as salinity. The diatom grew well and produced abundant lipids when using sewage water or liquid fertilizer derived from cattle feces without augmented carbon dioxide. High growth rates (doubling time <20 h) were obtained in a large-scale, open-air culture, in which light irradiance and temperature fluctuated and were largely different from laboratory conditions.ConclusionsThe ability of this microalga to accumulate TAG without nutrient deprivation, which incurs added labor, high costs, and complicates scalability, is important for low-cost industrial applications. Furthermore, its high tolerance to changes in environmental conditions and high growth rates observed in large-scale, open-air culture implied scalability of this diatom for industrial applications. Therefore, C. gracilis would have great potential as a biofactory.

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Effects of salinity stress on the growth and chlorophyll fluorescence of Phaeodactylum tricornutum and Chaetoceros gracilis (Bacillariophyceae)

Abstract: In this study, we investigated changes of fluorescence parameters, specific growth rate, and relative chlorophyll content (the ratio of the chlorophyll content after salinity exposure to that of the same samples at inoculation) in the two diatoms

Cited by 32 publications

References 22 publications

Environmental and nutrient conditions influence fucoxanthin productivity of the marine diatom Phaeodactylum tricornutum grown on palm oil mill effluent

Environmental and nutrient conditions influence fucoxanthin productivity of the marine diatom Phaeodactylum tricornutum grown on palm oil mill effluent

Effects of five heavy metals at sub-lethal concentrations on the growth and photosynthesis of Chlorella vulgaris

Advantageous characteristics of the diatom Chaetoceros gracilis as a sustainable biofuel producer

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