Fig. 4

Affected genes in core components of ABA signaling and flowering in poco1 in a schematic representation. In Arabidopsis, multiple factors affect flowering time to adapt the unfavorable conditions. In poco1 mutants, the core ABA signaling genes (PYRs/PYLs/RCARs, PP2Cs, SnRK2s and AREBs/ABFs) are down-regulated, which may lead to an impaired ABA and stress response. Down-regulation of ABF3 and ABF4, FRL and up-regulation of GRP7 may have an inhibitory effect on FLC expression. Besides, down-regulation of TEM1 and up-regulation of GI may induce FT expression. Down-regulation of TEM1 also induces the gibberellic acid biosynthesis gene, GA3ox1. Down-regulation of ELF4-L1, ELF4-L2, NAC089 and PHYE and up-regulation of FLP1, PRE1 and FBH2 are consistent with the early-flowering phenotype. Red and blue genes indicate up- and down-regulated genes respectively. Arrows and dashed arrows are indicative of inducing and inhibiting effects respectively