Further genome-based analysis of isoprenoid and carotenoid metabolism revealed duplications of genes for 1-deoxy-D-xylulose-5-phosphate synthase (DXS) and phytoene synthase (PSY), with the second gene copy of each enzyme being clustered together. Dunaliella salina has an exceptional ability to thrive even in saturated brine solutions. We postulate that a second broader glycerol cycle exists that also connects to photorespiration, thus extending the previously described glycerol cycle. Furthermore, Dunaliella is more tolerant to fuel oil contamination compared with other planktonic algae ( Brown and Borowitzka 1979 ). Dunaliella salina is a bacterium that is able to live in aqueous solutions with such high salt concentrations that the salt cannot fully dissolve. Cell size distribution differs significantly in the cultures grown in the salinity range from 1.5 to 15 % NaCl. Dunaliella Salina is a micro algae species. Avron, M. (1986) The osmotic components of halotolerant algae. genesis and adaptations to life in high-salinity environments. Its di‐domain glycerol‐3‐phosphate dehydrogenase (GPDH) isoform is likely to underlie the rapid production of the osmoprotectant glycerol. (1997) Activation of a 74 kDa plasma membrane protein kinase by hyperosmotic shocks in the halotolerant alga, Curtain, C.C., Looney, F.D., Regan, D.L. The chloroplast of Dunaliella also has an eyespot that sits at an anterior peripheral position and is made of one to two rows of lipids. T he halotolerant green alga Dunaliella salina Teodoresco is the type species of the Dunaliella genus (class Chlorophyceae)(1, 2). Possible involvement of fatty acid elongation in the salt tolerance of D. salina A salt-inducible gene from D. salina encoded a protein … The unicellular alga Dunaliella is unique in its ability to adapt to extreme environmental conditions. Download : Download high-res image (121KB)Download : Download full-size image. We also investigated genome-based capabilities regarding glycerol metabolism and present an extensive map for core carbon metabolism. Dunaliella salina is a type of halophile green micro-algae especially found in sea salt fields. Chem. Identification of expansion of the gene family coding for Sonic Hedgehog receptor-related proteins. Firstly, the lack of cell wall allows the cell to easily expand and contract to maintain liveable … (1990) Indications for a K. Gounaris, N., Pick, U. and Barber, J. In brief, our genomic data provide the basis for further gene discoveries regarding sensing abiotic stress, the metabolism of this halophilic alga, and its potential in biotechnological applications. The alga D. salina strain CCAP 19/18 was obtained from the … Dunaliella salina, is the most halotolerant eukaryotic photosynthetic organism known to date [14,15] since it shows a remarkable degree of adaptation to a variety of salt concentrations and it accumulates large amounts of carotenes under extremely stressful conditions such as high salinity, low nitrogen levels, and high solar radiation . and Haug, A. Halophilic representatives of the genus Dunaliella, notably D. salina and D. viridis, are found worldwide in salt lakes and saltern evaporation and crystallizer ponds at salt concentrations up to NaCl saturation. 30. This process is experimental and the keywords may be updated as the learning algorithm improves. Dunaliella is a unique unicellular species of algae harvested from the Dead Sea containing rich concentrations of carotenoids (mainly Beta-Carotene), antioxidants and essential vitamins . We discovered multiple unique genes coding for several of the homologous superfamily of the Ser-Thr-rich glycosyl-phosphatidyl-inositol-anchored membrane family and of the glycolipid 2-alpha-mannosyltransferase family, suggesting that such components on the cell surface are essential to life in high salt. A large transcriptome database of D.salina during the adjustment, exponential and stationary growth phases was generated using a high throughput sequencing platform. Science, Ehrenfeld, J. and Cousin, J.L. It provides a range of trace minerals and nutrients. Part of Springer Nature. nutraceutical applications, Dunaliella is gaining attention as a potential candidate in algal biotechnology 13. and Martin, W.A. Life in high salinity environments poses challenges to cells in a variety of ways: maintenance of ion homeostasis and nutrient acquisition, often while concomitantly enduring saturating irradiances. Long-term adaptive response to high-frequency light signals in the unicellular photosynthetic eukaryote Dunaliella salina Biotechnol Bioeng . Insights into protein adaptation to a saturated salt environment from the crystal structure of a halophilic 2Fe-2S ferredoxin. By continuing you agree to the use of cookies. The unicellular halotolerant green alga Dunaliella is unique in its ability to adapt to most hypersaline ecosystems. Few organisms can survive like D. salina does in such highly saline conditions as salt evaporation ponds. It is a recognized model organism for studying plant adaptation to high salinity (Oren, 2005; Gong et al., 2014; Liu et al., 2015; Arroussi et (1995) Structural features that stabilize halophilic malate dehydrogenase from an archeobacterium. (1994). ScienceDirect ® is a registered trademark of Elsevier B.V. ScienceDirect ® is a registered trademark of Elsevier B.V. © 2020 Elsevier B.V. All rights reserved. 9–14. and Thompson Jr., G.A. Discovery of a novel gene cluster coding for a 1-deoxy-D-xylulose 5-phosphate synthase (DXS) and a phytoene synthase (PSY). Brown, F.F., Sussman, I., Avron, M. and Degani, H. (1982) NMR studies of glycerol permeability in lipid vesicles, erythrocytes and the plasma membrane of the halotolerant green alga, Chitlaru, E. and Pick, U. (1982) Characterization of an invertebrate transferrin from the crab, Katz, A., Kaback, R. and Avron, M. (1986). Copyright © 2020 Elsevier B.V. or its licensors or contributors. This service is more advanced with JavaScript available, Salinity: Environment - Plants - Molecules D. salina was able to adapt to 6 μm sulfate; under these conditions, the cells showed reduced growth and photosynthetic rates. A salt-induced 60-kilodalton plasma membrane protein plays a potential role in the extreme halotolerance of the alga, Fisher, M., Gokhman, I., Pick, U. and Zamir, A. To survive, these organisms have high concentrations of β-carotene to … Some strains are noncarotenogenic while other strains may respond differently to applied growth conditions and produce enhanced carotenoid levels. Borowitzka, L.J. Plenum Press, New York, pp. A salt-resistant plasma membrane carbonic anhydrase is induced by salt in, Fisher, M., Gokhman, I., Pick, U. and Zamir, A. (1992) ATPases and ion transport in, Pick, U., Karni, L. and Avron, M. (1986) Determination of ion content and ion fluxes in the halotolerant alga, Pick, U. and Weiss, M. (1991) Polyphosphate hydrolysis within acidic vacuoles in response to amine-induced alkaline stress in the halotolerant alga, Pick, U., Zeelon, O. and Weiss, M. (1991) Amine accumulation in acidic vacuoles protects the halotolerant alga, Popova, L., balnokin, Y., Dietz, K.J. Over 10 million scientific documents at your fingertips. Maeda, M. and Thompson Jr., G.A. Dunaliella salina (Chlorophyta) and similar hypersaline strains have biflagellated, pear-shaped cells. Sadka, A., Lers, A., Zamir, A. and Avron, M. (1989). and Gimmler, H. (1998). This ability has made it a model organism for studying responses to abiotic stress factors. and Saito, H. (1994) A two-component system that regulates an osmosensing MAP kinase cascade in yeast. Often, new isolates of … Brown, A.D. (1990) Microbial Water Stress Physiology, Principles and Perspectives, John Wiley and sons, Chichester, England.

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