title: Alterations in lipid and fatty acid composition of the cyanobacterium Scytonema geitleri bharadwaja under water stress.
abstract: The composition of the glycerolipids [monogalactosyl diacylglycerol (MGDG), digalactosyl diacylglycerol (DGDG), sulfoquinovosyl diacylglycerol (SQDG) and phosphatidylglycerol (PG)] and alterations in their saturation and unsaturation levels in response to osmotic and matric water potential have been investigated in the cyanobacterium Scytonema geitleri Bharadwaja. The level of MGDG in S. geitleri was high followed by PG, DGDG and SQDG. Whereas, the amount of fatty acids namely palmitic, stearic, oleic, linoleic and linolenic acid were high, arachidic and behenic acid were, however, present in traces in the four glycerolipids. A significant reduction in the level of total lipid as well as individual class lipid was observed in S. geitleri in response to matric water potential to that of its total lipid and individual class lipid in response to osmotic water potential. The levels of polyunsaturated and unsaturated fatty acids also increased in response to matric water potential to that of osmotic water potential.
authors.affiliation: Banaras Hindu University Centre of Advanced Study in Botany Varanasi India.
authors.forename: M K
authors.initials: MK
authors.lastname: Singh
authors.affiliation: Banaras Hindu University Centre of Advanced Study in Botany Varanasi India.
authors.forename: P K
authors.initials: PK
authors.lastname: Rai
authors.affiliation: Banaras Hindu University Centre of Advanced Study in Botany Varanasi India.
authors.forename: A
authors.initials: A
authors.lastname: Rai
authors.affiliation: Banaras Hindu University Centre of Advanced Study in Botany Varanasi India surendrasingh.bhu&commat;gmail.com.
authors.forename: S
authors.initials: S
authors.lastname: Singh
mesh_terms: D000458:Cyanobacteria / Q000737:chemistry / Q000378:metabolism*; D004075:Diglycerides / Q000032:analysis / Q000378:metabolism*; D005227:Fatty Acids / Q000032:analysis / Q000378:metabolism*; D038983:Galactolipids / Q000032:analysis / Q000378:metabolism*; D009994:Osmolar Concentration; D009997:Osmotic Pressure; D010715:Phosphatidylglycerols / Q000032:analysis / Q000378:metabolism*; D014867:Water / Q000378:metabolism*
chemical_list: D004075:Diglycerides; D005227:Fatty Acids; D038983:Galactolipids; D010715:Phosphatidylglycerols; C007388:digalactosyldiacylglycerol; C009909:monogalactosyldiacylglycerol; C003367:sulphoquinovosyl-diacylglycerol; D014867:Water