Effect of cadmium on lipid composition of pepper.
Seedlings (2 weeks old) of pepper (Capsicum annum) were grown in nutrient solution with added CdCl(2) (10 or 50 microM) for 7 days. In Cd-treated plants, changes in acyl lipids and fatty acid composition were investigated. Cd particularly lowered the amount of monogalactosyldiacylglycerol (MGDG) and enhanced accumulation of phospholipids [phosphatidylcholine (PC), phosphatidylethanolamine and phosphatidylglycerol] in leaves. In contrast, content of PC and galactolipids (MGDG and digalactosyldiacylglycerol) decreased in roots. Fatty acid composition of leaves was also changed by Cd addition to external medium, but no important changes occurred in roots. Levels of leaf polyunsaturated fatty acids, especially 18:3 and 16:3, were reduced. Lipid and fatty acid composition changes in roots are discussed in relation to Cd tolerance in pepper.
Jemal
F
F
Laboratoire de Physiologie Végétale, Département des Sciences Biologiques, Faculté des Sciences, 1060 Tunis, Tunisia. jemal@planet.tn
Zarrouk
M
M
Ghorbal
M H
MH
D019256:Cadmium Chloride / Q000494:pharmacology*; D002212:Capsicum / Q000187:drug effects / Q000502:physiology*; D002374:Catalase / Q000378:metabolism; D004075:Diglycerides / Q000378:metabolism; D005227:Fatty Acids / Q000032:analysis / Q000378:metabolism; D038983:Galactolipids; D005978:Glutathione / Q000378:metabolism; D019803:Glutathione Disulfide / Q000378:metabolism; D006017:Glycolipids / Q000378:metabolism; D018527:Hydroponics; D050356:Lipid Metabolism; D015227:Lipid Peroxidation / Q000187:drug effects; D009195:Peroxidase / Q000378:metabolism; D010713:Phosphatidylcholines / Q000378:metabolism; D010714:Phosphatidylethanolamines / Q000378:metabolism; D010715:Phosphatidylglycerols / Q000378:metabolism; D010743:Phospholipids / Q000378:metabolism*; D018515:Plant Leaves / Q000378:metabolism; D018517:Plant Roots / Q000378:metabolism; D010946:Plants, Medicinal; D013997:Time Factors
D004075:Diglycerides; D005227:Fatty Acids; D038983:Galactolipids; D006017:Glycolipids; D010713:Phosphatidylcholines; D010714:Phosphatidylethanolamines; D010715:Phosphatidylglycerols; D010743:Phospholipids; C009909:monogalactosyldiacylglycerol; C121048:guaiacol peroxidase; D002374:Catalase; D009195:Peroxidase; D005978:Glutathione; D019256:Cadmium Chloride; D019803:Glutathione Disulfide