Journal
BIOCHIMICA ET BIOPHYSICA ACTA-BIOMEMBRANES
Volume 1561, Issue 2, Pages 251-265Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0005-2736(02)00352-8
Keywords
chloroplast membrane; chlorophyll fluorescence; heat stress; lipid unsaturation; photochemical apparatus; Chlamydomonas subcaudata
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Sensitivity of the photosynthetic thylakoid membranes to thermal stress was investigated in the psychrophilic Antarctic alga Chlamydomonas subcaudata. C subcaudata thylakoids exhibited an elevated heat sensitivity as indicated by a temperature-induced rise in F,, fluorescence in comparison with the mesophilic species, Chlamydomonas reinhardtii. This was accompanied by a loss of structural stability of the photosystem (PS) 11 core complex and functional changes at the level of PSI in C reinhardtii, but not in C subcaudata. Lastly, C subcaudata exhibited an increase in unsaturated fatty acid content of membrane lipids in combination with unique fatty acid species. The relationship between lipid unsaturation and the functioning of the photosynthetic apparatus under elevated temperatures is discussed. (C) 2002 Elsevier Science B.V. All rights reserved.
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