Abstract
The unsaturated fatty acyl group linolenic acid of lipids (LA) suppresses flowering in Arabidopsis thaliana. Compared to 22°C, a low temperature (15°C) increases LA and delays flowering in wild-type plants (Col). Since the delay of flowering by low temperatures was reduced by triple mutations in FAD3, FAD7 and FAD8 genes encoding LA- synthesizing enzymes, it is considered to be attributed to LA. The early-flowering phenotype of 35S-AP1 plants was suppressed by low temperatures or a cross with 35S-FAD3 plants, LA suppresses the flowering determination by AP1. The delay of flowering by low temperature was reduced by certain mutations in AP1 gene. To elucidate the LA-controlled domain of AP1, we introduced several truncated AP1 constructs into wild-type plants and characterized flowering phenotypes.
