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PHOTOSYNTHETIC CHARACTERIZATION OF A MUTANT OF NANNOCHLOROPSIS DEFICIENT IN THE SYNTHESIS OF EICOSAPENTAENOIC ACID

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Photosynthetic performance of an eicosapentaenoic acid (EPA; 20:5ω3) deficient mutant of the eustigmatophyte Nannochloropsis sp. was compared to the wild type (Wt) strain in order to evaluate the effect of fatty acid composition on the function of the photosynthetic apparatus. Cellular photosynthetic capacity and the cellular pool of pigments and of reaction centers were reduced in the mutant concomitant with a reduction in the amount of thylakoid membranes and their volume-specific density. Despite the changes observed in photosynthetic activity, the fluorescence properties of the mutant were virtually the same as those of the wild type, although the phase transition of thylakoid membrane was recorded at higher temperature in the mutant than in the Wt. The results suggest that the change in one double bond in a very long chain fatty acid of the thylakoid lipids plays a minor role in regulating photosynthetic electron transport, but that the mutation modified the ability of the mutant to acclimate to low-irradiance conditions.

Affiliations: 1: Israel Oceanographic and Limnological Research, National Institute of Oceanography assaf@ocean.org.il ; 2: Applied Biological Sciences Branch, National Renewable Energy Laboratory ; 3: Israel Oceanographic and Limnological Research, National Institute of Oceanography ; 4: Department of Life Sciences, Bar-Ilan University ; 5: Environmental Biophysics and Molecular Biology Program, Oceanographic and Atmospheric Sciences Division, Brookhaven National Laboratory

10.1080/07929978.1998.10676716
/content/journals/10.1080/07929978.1998.10676716
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/content/journals/10.1080/07929978.1998.10676716
1998-05-13
2018-07-17

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