caa a22 4500 475783662 CHVBK 20180406123652.0 cr unu---uuuuu 170329e20001001xx s 000 0 eng 10.1023/A:1008165900780 doi (NATIONALLICENCE)springer-10.1023/A:1008165900780 Changes in chlorophyll fluorescence quenching and pigment composition in the green alga Chlorococcum sp. grown under nitrogen deficiency and salinity stress [Elektronische Daten] [J. Masojídek, G. Torzillo, J. Kopecký, M. Koblížek, L. Nidiaci, J. Komenda, A. Lukavská, A. Sacchi] Changes in the in vivo chlorophyll fluorescencequenching, photosynthesis and pigment composition werefollowed in the green alga Chlorococcum sp.during exposure of the culture to nitrogen deficiencyand salinity stress with the aims to study theinterrelations between changes in physiological andphotochemical parameters and xanthophyll-cyclepigments content during adaptation to stress, and toevaluate the capacity of this green alga to producesecondary carotenoids in tubular photobioreactors.Exposure of Chlorococcum to nitrogendeficiency, 0.2 M NaCl and high irradiance outdoorscaused a strong depression of the photosyntheticactivity and of photochemical quantum yield ofPSII (Fv/Fm). These changes wereaccompanied by an increase of the non-photochemicalquenching coefficient (NPQ), of the amount ofxanthophyll-cycle pigments and of thecarotenoid/chlorophyll ratio. As a result of exposureto stress conditions, cell division completelystopped, although an increase in the biomass dryweight could be detected due to an increase in thecell size. These processes were followed, with acertain delay (15-20 h), by massive appearance ofsecondary carotenoids that reached the maximum (about50% total carotenoids) after 2-3 days of cultivation.The results show that despite of the lower carotenoidcontent (2 mg g-1 dry wt) as compared with Haematococcus, Chlorococcum can be apotentially interesting strain for secondarycarotenoid production because of its higher growthrate. Kluwer Academic Publishers, 2000 astaxanthin nationallicence Chlorococcum sp nationallicence Wfluorescence nationallicence nitrogen deficiency nationallicence photobioreactor nationallicence secondary carotenoid nationallicence salinity nationallicence xanthophyll cycle nationallicence Masojídek J. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut Torzillo G. Centro di Studio dei Microrganismi Autotrofi del CNR, Piazzale delle Cascine 27, 50144, Florence, Italy aut Kopecký J. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut Koblížek M. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut Nidiaci L. Centro di Studio dei Microrganismi Autotrofi del CNR, Piazzale delle Cascine 27, 50144, Florence, Italy aut Komenda J. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut Lukavská A. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut Sacchi A. Centro di Studio dei Microrganismi Autotrofi del CNR, Piazzale delle Cascine 27, 50144, Florence, Italy aut Journal of Applied Phycology Kluwer Academic Publishers 12/3-5(2000-10-01), 417-426 0921-8971 12:3-5<417 2000 12 10811 https://doi.org/10.1023/A:1008165900780 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1023/A:1008165900780 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Masojídek J. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut NATIONALLICENCE 700 1- Torzillo G. Centro di Studio dei Microrganismi Autotrofi del CNR, Piazzale delle Cascine 27, 50144, Florence, Italy aut NATIONALLICENCE 700 1- Kopecký J. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut NATIONALLICENCE 700 1- Koblížek M. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut NATIONALLICENCE 700 1- Nidiaci L. Centro di Studio dei Microrganismi Autotrofi del CNR, Piazzale delle Cascine 27, 50144, Florence, Italy aut NATIONALLICENCE 700 1- Komenda J. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut NATIONALLICENCE 700 1- Lukavská A. Department of Autotrophic Microorganisms, Institute of Microbiology, Academy of Sciences, 379 81, Třeboň, Czech Republic aut NATIONALLICENCE 700 1- Sacchi A. Centro di Studio dei Microrganismi Autotrofi del CNR, Piazzale delle Cascine 27, 50144, Florence, Italy aut NATIONALLICENCE 773 0- Journal of Applied Phycology Kluwer Academic Publishers 12/3-5(2000-10-01), 417-426 0921-8971 12:3-5<417 2000 12 10811 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer