caa a22 4500 445318457 CHVBK 20180317142655.0 cr unu---uuuuu 170323e20110601xx s 000 0 eng 10.1007/s10126-010-9306-y doi (NATIONALLICENCE)springer-10.1007/s10126-010-9306-y UV-A Mediated Modulation of Photosynthetic Efficiency, Xanthophyll Cycle and Fatty Acid Production of Nannochloropsis [Elektronische Daten] [Eduardo Forján, Inés Garbayo, Marta Henriques, Jorge Rocha, José Vega, Carlos Vílchez] Nannochloropsis, a green microalga, is a source for commercially valuable compounds as extensively described and, in particular, is recognised as a good potential source of eicosapentaenoic acid (20:5ϖ3), an important polyunsaturated fatty acid for human consumption for prevention of several diseases. Climate change might include variation in the ultraviolet (UV) levels as one of the consequences derived from the anthropogenic activity. This paper shows the response of Nannochloropsis cultures exposed for 7days to UV-A (320-400nm) added to photosynthetically active radiation (PAR; 400-700nm). Growth rates and photosynthetic activity were assessed to determine the impact of UV-A increased levels on the cell growth and basic metabolism activity. Xanthophyll pigments (zeaxanthin and violaxanthin), carotenoids (canthaxanthin and β-carotene) and polyunsaturated fatty acids (myristic, palmitic, palmitoleic, arachidonic and eicosapentaenoic acids) were measured for assessing the antioxidant response of the microalgae to added UV-A radiation to PAR. The results show that the modulated use of UV-A radiations can lead to increased growth rates, which are sustained in time by an increased light transduction activity. The expected antioxidant response to the incident UV-A radiation consisted of increases in zeaxanthin and β-carotene contents—synthesis of antioxidant carotenoids—and increases in the saturated fatty acids to polyunsaturated fatty acids ratio. The results suggest that modulated UV-A radiation can be used as a tool to stimulate value molecules accumulation in microalgae through an enhanced both light transduction process and antioxidant response, while sustaining cell growth. Springer Science+Business Media, LLC, 2010 Microalgae nationallicence Nannochloropsis nationallicence UV-A nationallicence Xanthophyll cycle nationallicence Fatty acids nationallicence Forján Eduardo Facultad de Ciencias Experimentales, Algal Biotechnology Group, Universidad de Huelva, Avda Tres de Marzo s/n, 21071, Huelva, Spain aut Garbayo Inés Facultad de Ciencias Experimentales, Algal Biotechnology Group, Universidad de Huelva, Avda Tres de Marzo s/n, 21071, Huelva, Spain aut Henriques Marta Chemical Engineering Department, University of Coimbra, 3030-290, Coimbra, Portugal aut Rocha Jorge Chemical Engineering Department, University of Coimbra, 3030-290, Coimbra, Portugal aut Vega José Facultad de Química, Departamento de Bioquímica Vegetal y Biología Molecular, Universidad de Sevilla, 41012, Sevilla, Spain aut Vílchez Carlos Facultad de Ciencias Experimentales, Algal Biotechnology Group, Universidad de Huelva, Avda Tres de Marzo s/n, 21071, Huelva, Spain aut Marine Biotechnology Springer-Verlag 13/3(2011-06-01), 366-375 1436-2228 13:3<366 2011 13 10126 https://doi.org/10.1007/s10126-010-9306-y text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10126-010-9306-y text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Forján Eduardo Facultad de Ciencias Experimentales, Algal Biotechnology Group, Universidad de Huelva, Avda Tres de Marzo s/n, 21071, Huelva, Spain aut NATIONALLICENCE 700 1- Garbayo Inés Facultad de Ciencias Experimentales, Algal Biotechnology Group, Universidad de Huelva, Avda Tres de Marzo s/n, 21071, Huelva, Spain aut NATIONALLICENCE 700 1- Henriques Marta Chemical Engineering Department, University of Coimbra, 3030-290, Coimbra, Portugal aut NATIONALLICENCE 700 1- Rocha Jorge Chemical Engineering Department, University of Coimbra, 3030-290, Coimbra, Portugal aut NATIONALLICENCE 700 1- Vega José Facultad de Química, Departamento de Bioquímica Vegetal y Biología Molecular, Universidad de Sevilla, 41012, Sevilla, Spain aut NATIONALLICENCE 700 1- Vílchez Carlos Facultad de Ciencias Experimentales, Algal Biotechnology Group, Universidad de Huelva, Avda Tres de Marzo s/n, 21071, Huelva, Spain aut NATIONALLICENCE 773 0- Marine Biotechnology Springer-Verlag 13/3(2011-06-01), 366-375 1436-2228 13:3<366 2011 13 10126 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer