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Plant Physiology 83:838-843 (1987)
© 1987 American Society of Plant Biologists

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Environmental and Stress Physiology

The Effects of Nitrogen Deficiency on Pigments and Lipids of Cyanobacteria

Isabel Canto de Loura, Jean Paul Dubacq and Jean Claude Thomas

Laboratoire des Biomembranes et Surfaces Cellulaires Végétales, Ecole Normale Supérieure, 46 rue d'Ulm, 75 230 Paris Cedex 05, France

In contrast to what happens in higher plants and eukaryotic algae, a nitrogen deficiency during growth causes a change in pigment composition but no significant changes in whole cell lipid and fatty acid composition of the two Cyanobacteria, Pseudanabaena sp. (strain M2) and Oscillatoria splendida (strain L3). Nitrogen deficiency does not affect the cellular content in chlorophyll a, but it causes a selective loss in phycobiliproteins; carotenoid content increases with phycocyanin depletion. The major cellular lipids in both Cyanobacteria studied are monogalactosyl diacylglycerol, digalactosyl diacylglycerol, sulfoquinovosyl diacylglycerol, and phosphatidylglycerol. The fatty acid composition is particularly interesting as both these filamentous Oscillatoriaceae show important contents in {alpha}- and {gamma}-linolenic (18:3) and parinaric (18:4) acids. This seems to be very unusual in Cyanobacteria.




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Copyright © 1987 by the American Society of Plant Biologists