Abstract
Linolenic acid (LA) suppresses flowering in Arabidopsis thaliana. Compared to 22 °C, a low temperature (15 °C) increases LA content and retards flowering in wild-type plants (Col). Since triple mutations in FAD3, FAD7 and FAD8 encoding enzyme synthesizing LA reduced the floral retardation by low temperatures, is considered to be attributed to LA. Considering flowering in 35S-AP1 plants overexpressing the flowering determination AP1 is early, and delayed by low temperatures or a cross with 35S-FAD3 plants overexpressing FAD3, LA directly influences the flowering determination by AP1. Here we investigated the relationship between the flowering determination and LA content in ap1 mutants. A decrease in content of LA followed AP1 expression when Col was grown at 22 °C. Among ap1 mutants was a mutant having less flowering-delay response to low temperatures than Col. These suggests that has a domain directly interacting LA, and this interaction controls AP1 function.
