Supplementary Figure 12: Proposed model of the photoperiod-regulated flowering pathway under short-day conditions.
From: Natural variation at the soybean J locus improves adaptation to the tropics and enhances yield
J is suppressed by two PHYAs, E3 and E4, and the J protein physically binds to the promoter of E1 near the LUX-binding motif to suppress E1 transcription. This relieves the E1-dependent transcriptional repression of FT2a and FT5a, which promote flowering. When the function of the J gene is impaired, E1 itself is released from repression and is able to repress FT2a and FT5a, resulting in later flowering.
