LIPID-CONTENT AND FATTY-ACID COMPOSITION IN N2-FIXING CYANOBACTERIUM ANABAENA-DOLIOLUM AS AFFECTED BY MOLYBDENUM DEFICIENCY

Anabaena doliolum grown under molybdenum deficiency produced less biom ass (on a dry wt basis) and the cells had lower protein content but hi gher carbohydrate content than Mo-grown material. Molybdenum deficienc y led to a slight decrease in chlorophyll a, a 1.5-fold increase in ca rotenoids and a 1.4-fold increase in total lipid but there was no diff erence in the lipid profiles of Mo-enriched and Mo-deficient cells. Mo lybdenum deficiency caused increases in the cell contents of digalacto syl diacylglycerol and phosphatidylglycerol and decreases in monogalac tosyl diacylglycerol and sulphoquinovosyl diacylglycerol lipids. The c oncentration of unsaturated C18 fatty acids was lower in the Mo-defici ent cells.