LIPID COMPOSITION IN FAST AND SLOW GERMINATING SUNFLOWER (HELIANTHUS ANNUUS L.) SEEDS

Summary. The physiochemical characteristics and lipid composition in fast and slow germinating sunflower ( Helianthus annuus L.) seeds were studied. The quantity of phospholipids, glycolipids and sterols in cotyledons and embryonic axes in fast germinating seeds (FG - embryo emerged within 24 h after sowing) increased progressively between the 1 st - 6 th days after sowing (DAS) compared with the slow growing seeds (SG embryo emerged after the 4 th DAS). The fatty acid composition in cotyledons of FG seeds showed increased levels of palmitic and oleic acids 6 and 8 DAS, while a decline in palmitic and stearic acids as well as accumulation of oleic and linoleic acids were observed in SG seeds. However, higher content of linolenic acid was found in the embryonic axes of FG seeds compared with SG seeds 6 and 8 DAS. The FG seeds located in the peripheral whorls of the inflorescence, with high quantity of storage lipids, contributed to the enhanced rate of germination compared with SG seeds located in the central whorls.

[1]  S. K. Munshi,et al.  Compositional changes in seeds influenced by their positions in different whorls of mature sunflower head , 2003 .

[2]  A. Karande,et al.  Isolation and Localization of a Cytosolic 10 S Triacylglycerol Biosynthetic Multienzyme Complex from Oleaginous Yeast* , 2001, The Journal of Biological Chemistry.

[3]  R. Garcés,et al.  Lipid characterization in vegetative tissues of high saturated fatty acid sunflower mutants. , 1998, Journal of agricultural and food chemistry.

[4]  A. Hoppe,et al.  Degradation of oil bodies isolated from cotyledons during germination of rapeseed seedlings , 1997 .

[5]  E. A. Brown,et al.  Fatty Acid Compositions in Newly Differentiated Tissues of Soybean Seedlings , 1996 .

[6]  J. M. Sung,et al.  Lipid peroxidation and peroxide‐scavenging in soybean seeds during aging , 1996 .

[7]  H. Ohta,et al.  A close relationship between increases in galactosyltransferase activity and the accumulation of galactolipids during plastid development in cucumber seedlings , 1995 .

[8]  N. Priolo,et al.  Properties of the lipolytic system responsible for the mobilization of storage lipids in Helianthus annuus L. seeds , 1994 .

[9]  K. S. Dhillon,et al.  Lipid biosynthesis in seeds of mustard (Brassica juncea) influenced by zinc and sulphur deficiency , 1990 .

[10]  P. Hocking,et al.  Dry matter, minerals and carbohydrates in the capitulum of sunflower (Helianthus annuus): Effects of competition between seeds, and defoliation , 1988 .

[11]  I. Bhatia,et al.  Changes in the Activity of Acetyl CoA Carboxylase in Germinating and Ripening Sunflower Seeds , 1978 .

[12]  J. Folch,et al.  A simple method for the isolation and purification of total lipides from animal tissues. , 1957, The Journal of biological chemistry.