Comparison of phospholipids and their fatty acids in recalcitrant and orthodox seeds
Membrane phospholipids play an important role in acclimation of seeds to desiccation stresses. The aim of this study was to investigate the composition of phospholipids and the fatty acids in embryonic axes of several recalcitrant seeds and orthodox seeds. The range of ratio of phosphatidylethanolamine to phosphatidylcholine in embryonic axes of recalcitrant seeds and orthodox seeds was overlapping. Percentage of saturation of fatty acids of phospholipid (stearic acid, C18:0 and palmitic acid, C16:0) was significantly different between orthodox seeds (in the range of 16% to 27%) and recalcitrant seeds (32% to 36%) and this difference also reflected in the apparent lower phase transition temperature of orthodox seeds. The proportion of unsaturated fatty acids (C18:2 and C18:3) of phospholipid was overlapping in both seed types. In conclusion, recalcitrant seed while sharing recalcitrance, exhibited greater fatty acid saturation and higher weight percentage of linolenic acid (C18:3) in phospholipid and higher phase transition temperature when compared with orthodox seed.
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Document Type: Research Article
Publication date: July 1, 2006
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