Salt-induced lipid changes in Catharanthus roseus cultured cell suspensions.
Salt treatment strongly affected cell growth by decreasing dry weight. Exposure of Catharanthus roseus cell suspensions to increasing salinity significantly enhanced total lipid (TL) content. The observed increase is mainly due to high level of phospholipids (PL). Hundred mM NaCl treatment increased phospholipid species phosphatidylcholine (PC) and phosphatidylethanolamine (PE), whereas it reduced glycolipid ones monogalactosyldiacylglycerol (MGDG) and digalactosyldiacylglycerol (DGDG) but not sulfoquinovosyldiacylglycerol (SQDG). Moreover, fatty acid composition was clearly modified when cells were cultured in the presence of 100 mM NaCl, whereas only few changes occurred at 50 mM. Salt treatment decreased palmitic acid (16:0) level and increased that of linolenic acid (18:2). Such effect was observed in phospholipid species PC and PE and in glycolipid DGDG. Double bond index (DBI) was enhanced more than 2-fold in fatty acids of either glycolipids or phospholipids from cells submitted to 100 mM NaCl. Free sterol content was also significantly enhanced, especially at 100 mM NaCl, whereas free sterols/phospholipids (St/PL) ratio was slightly decreased. All these salt-induced changes in membrane lipids suggest an increase in membrane fluidity of C. roseus cells.
Elkahoui
Salem
S
Laboratoire Interactions Légumineuses-Microorganismes, Institut National de Recherche Scientifique et Technique, BP 95-2050 Hammam-Lif, Tunisia.
Smaoui
Abderrazek
A
Zarrouk
Mokhtar
M
Ghrir
Rachid
R
Limam
Férid
F
D030008:Catharanthus / Q000187:drug effects / Q000254:growth & development*; D002478:Cells, Cultured; D003470:Culture Media; D005227:Fatty Acids / Q000032:analysis; D006017:Glycolipids / Q000737:chemistry / Q000378:metabolism; D008560:Membrane Fluidity; D010743:Phospholipids / Q000737:chemistry / Q000378:metabolism; D012965:Sodium Chloride / Q000494:pharmacology*; D013045:Species Specificity
D003470:Culture Media; D005227:Fatty Acids; D006017:Glycolipids; D010743:Phospholipids; D012965:Sodium Chloride