CHANGES IN FATTY-ACIDS COMPOSITION OF SUBCELLULAR-FRACTIONS FROM HYPOCOTYLS OF WINTER RAPE GROWING AT 2-DEGREES-C OR 20-DEGREES-C

The fatty acids composition of polar lipids in subcellular fractions f rom hypocotyls of winter rape growing at 2 degrees C and 20 degrees C depended both on the temperature and on the growth stage of the hypoco tyl. Both the 16 000 x g and the 500 x g fraction at 2 degrees C showe d the greatest increase in the unsaturation of lipids in comparison wi th the control (20 degrees C). At 2 degrees C, unlike at 20 degrees C, a rapid increase in the value of the ratio of the content of linoleni c acid to that of linoleic acid in the lipids was observed in all frac tions. These changes took place during the period required for complet e vernalization of the variety of rape examined.