Figure 1
A predicted model of flowering time pathway in sorghum based on GIGANTEA-CONSTANS-FLOWERING LOCUS T (GI-CO-FT) regulatory module, found in Arabidopsis and rice. Light regulated and gated by circadian clock proteins, LATE ELONGATED HYPOCOTYL (LHY), CIRCADIAN CLOCK ASSOCIATED (CCA1) and TIMING OF CAB1 (TOC1). SbPhyB may stabilize and interact with SbPhyC to inhibit flowering in long days (> 12 h) by activating expression of SbPRR37 and SbGhd7, which results in repression of floral activators Early Heading Date 1 (SbEHD1), and FT-like genes CENTRORADIALIS 8 and 12 (SbCN8 and SbCN12) required for floral initiation. SbPhyB facilitates repression of SbCN15. Under long days Ma2 may have an epistatic interaction with Ma4 to delay flowering by inducing expression of SbPRR37 and SbCO to co-repress the expression of SbCN12. Figure adapted and modified from Yang et al.17 and Casto et al.18. Created using BioRender.com.
