Temporal variation in fatty acid composition of<i>Ulothrix zonata</i>(Chlorophyta) from ice and benthic communities of Lake Baikal

Osipova, S. V.; Дударева, Л. В.; Бондаренко, Н. А.; Nasarova, Alexandra; Sokolova, N. A.; Obolkina, L. A.; Glyzina, Olga; Тимошкин, О. А.

doi:10.2216/08-49.1

Cited by 13 publications

(9 citation statements)

References 18 publications

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“…In both stages, the strain and the field cysts of C. hindakii had a high level of PUFAs, which is regarded as an adaptation to cold conditions [69]. High levels of PUFAs are common also for other snow-dwelling Chloromonas species (e.g., see FAs composition in Table 5 in [20]) and algae living in other cold habitats such as lake ice [70]. Hexadecatetraenoic acid was present in flagellates of C. hindakii at relatively high levels of total FAs (~30%); its production in C. hindakii was the same as in a strain of C. remiasii CCCryo 005-99 isolated from snow in the Arctic and kept under nitrogen deficient conditions [71].…”

Section: Discussionmentioning

confidence: 99%

Ecophysiology of Chloromonas hindakii sp. nov. (Chlorophyceae), Causing Orange Snow Blooms at Different Light Conditions

et al. 2019

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Slowly melting snowfields in mountain and polar regions are habitats of snow algae. Orange blooms were sampled in three European mountain ranges. The cysts within the blooms morphologically resembled those of Chloromonas nivalis (Chlorophyceae). Molecular and morphological traits of field and cultured material showed that they represent a new species, Chloromonas hindakii sp. nov. The performance of photosystem II was evaluated by fluorometry. For the first time for a snow alga, cyst stages collected in a wide altitudinal gradient and the laboratory strain were compared. The results showed that cysts were well adapted to medium and high irradiance. Cysts from high light conditions became photoinhibited at three times higher irradiances (600 µmol photons m−2 s−1) than those from low light conditions, or likewise compared to cultured flagellates. Therefore, the physiologic light preferences reflected the conditions in the original habitat. A high content of polyunsaturated fatty acids (about 60% of total lipids) and the accumulation of the carotenoid astaxanthin was observed. They are regarded as adaptations to cope with extreme environmental conditions of snow that include low temperatures, freeze-thaw cycles, and variable light intensity. The intraspecific ability of adaptation of the photosynthetic apparatus to different irradiance regimes seems to be advantageous for thriving in different snow habitats.

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Section: Discussionmentioning

confidence: 99%

Ecophysiology of Chloromonas hindakii sp. nov. (Chlorophyceae), Causing Orange Snow Blooms at Different Light Conditions

et al. 2019

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“…Generally, the increase in the proportion of unsaturated or short-chain fatty acids, as well as the unsaturation of FAs, helps to maintain membrane fluidity at low temperatures (Thompson et al 1992;An et al 2013). The enhancement on synthesis of C18:3 and several MUFAs under low temperatures implied that these UFAs might have a role in adjustment of membrane fluidity (Morgan-Kiss et al 2006;Osipova et al 2009). However, in Chlorella-Arc, the content of the short-chain fatty acid, C14:0, decreased under low temperature, indicating that regulation of membrane fluidity in Chlorella-Arc might not be related to short-chain fatty acids such as C14:0.…”

Section: Discussionmentioning

confidence: 99%

The eurythermal adaptivity and temperature tolerance of a newly isolated psychrotolerant Arctic Chlorella sp.

Cao

Yang

et al. 2015

J Appl Phycol

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A new strain of Chlorella sp. (Chlorella-Arc), isolated from Arctic glacier melt water, was found to have high specific growth rates (μ) between 3 and 27°C, with a maximum specific growth rate of 0.85 day −1 at 15°C, indicating that this strain was a eurythermal strain with a broad temperature tolerance range. To understand its acclimation strategies to low and high temperatures, the physiological and biochemical responses of the Chlorella-Arc to temperature were studied and compared with those of a temperate Chlorella pyrenoidosa strain (Chlorella-Temp). As indicated by declining F v /F m , photoinhibition occurred in Chlorella-Arc at low temperature. However, Chlorella-Arc reduced the size of the light-harvesting complex (LHC) to alleviate photoinhibition, as indicated by an increasing Chl a/b ratio with decreasing temperatures. Interestingly, Chlorella-Arc tended to secrete soluble sugar into the culture medium with increasing temperature, while its intracellular soluble sugar content did not vary with temperature changes, indicating that the algal cells might suffer from osmotic stress at high temperature, which could be adjusted by excretion of soluble sugar. Chlorella-Arc accumulated protein and lipids under lower temperatures (<15°C), and its metabolism switched to synthesis of soluble sugar as temperatures rose. This reflects a flexible ability of Chlorella-Arc to regulate carbon and energy distribution when exposed to wide temperature shifts. More saturated fatty acids (SFA) in Chlorella-Arc than Chlorella-Temp also might serve as the energy source for growth in the cold and contribute to its cold tolerance.

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“…Fourth, a review of drivers of colonization and succession in polar habitats found that biotic factors, such as grazing, can strongly affect colonization patterns and also alter competitive Investigation of ice algae and phytoplankton food quality as food source for two common Arctic macrobenthic species showed that both consumer species had higher fatty acid content and proportion of polyunsaturated components when they were fed on ice algae compared to phytoplankton, implying that ice algae has a higher food quality (Sun et al, 2009). This was supported by a study from Lake Baikal that showed that monoenoic fatty acids have a much higher concentration in Ulothrix zonata growing in the ice and at low temperature than in U. zonata growing on the stony bottom (Osipova et al, 2009).…”

Section: Polar Algae and Ice Algae Five Reviews Dealtmentioning

confidence: 72%

Substratum‐Associated Microbiota

Liess¹,

Francoeur²

2010

Water Environment Research

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Temporal variation in fatty acid composition ofUlothrix zonata(Chlorophyta) from ice and benthic communities of Lake Baikal

Cited by 13 publications

References 18 publications

Ecophysiology of Chloromonas hindakii sp. nov. (Chlorophyceae), Causing Orange Snow Blooms at Different Light Conditions

Ecophysiology of Chloromonas hindakii sp. nov. (Chlorophyceae), Causing Orange Snow Blooms at Different Light Conditions

The eurythermal adaptivity and temperature tolerance of a newly isolated psychrotolerant Arctic Chlorella sp.

Substratum‐Associated Microbiota

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