Regulation and function of SOC1, a flowering pathway integrator

SOC1, encoding a MADS box transcription factor, integrates multiple flowering signals derived from photoperiod, temperature, hormone, and age-related signals. SOC1 is regulated by two antagonistic flowering regulators, CONSTANS (CO) and FLOWERING LOCUS C (FLC), which act as floral activator and repressor, respectively. CO activates SOC1 mainly through FT but FLC represses SOC1 by direct binding to the promoter. SOC1 is also activated by an age-dependent mechanism in which SPL9 and microRNA156 are involved. When SOC1 is induced at the shoot apex, SOC1 together with AGL24 directly activates LEAFY (LFY), a floral meristem identity gene. APETALA1 (AP1), activated mainly by FT, is also necessary to establish and…

• RD
  Rural Development Administration