Abstract
The transition from vegetative to reproductive phase is a crucial moment in the life of higher plants in order to ensure a better reproductive success. Flowering time is controled by both external and internal factors and is precisely regulated by a complex genes network. In 1991, Koorneef divided the flowering-related genes into four pathways : photoperiodic, autonomous, GA-dependant and vernalization-dependant pathways.
My work aimed to identify new genes involved in the regulation of Arabidopsis thaliana flowering. Three late-flowering mutants have been identified and named fla1 to fla3. First results have shown that fla1 (At5g06850) belongs to the photoperiodic and fla2 (At1g61940) to the autonomous pathway. RT-PCR analysis have shown that photoperiodic genes downstream of CO and some of the autonomous pathway genes are down-regulated in fla1 and fla2. FLC expression in fla2 and FLM expression in fla1 and fla2 are up-regulated.
