Abstract
The unsaturated fatty acyl group linolenic acid (18:3) of lipids suppresses flowering in Arabidopsis thaliana. Compared to 22oC, a low temperature (15oC) increases 18:3 and delays flowering in wild-type plants (Col-0). Since the delay of flowering by low temperatures was reduced by triple mutations in FAD3, FAD7 and FAD8 genes encoding 18:3- synthesizing enzymes, it is considered to be attributed to 18:3. The early-flowering phenotype of 35S-AP1 plants was suppressed by low temperatures or a cross with 35S-FAD3 plants, 18:3 suppresses the flowering determination by AP1. To confirm whether the subcellular localization of AP1 is controlled by 18:3, we expressed the GFP fusion protein transiently in Col-0, fad3 fad7 fad8 and 35S-FAD3 plants. We will report the results and discuss their contribution for flowering.
