Abstract
During the development of pea seedlings in complete darkness or under a short-day photoperiod, the capacity of linolenic acid biosynthesis reaches a maximum about 7 days after germination. At all stages of development the light markedly and specifically increases the incorporation of 1-14C-acetate into the linolenic acid, causing a 20-fold increase in the labelling at the maximum as compared with dark incubation. The evolution of the capacity of linolenic acid biosynthesis in leaves follows strictly the ability to produce chlorophyll under light. First analysis shows that the linolenic acid biosynthesis observed occurs specifically into the galactolipids.
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