Fig. 2

Expression of GI homologs and putative flowering time genes in soybeans. a The expression of GIa, GIb, and GIc during the seedling development of wild and domesticated soybeans under short-day conditions (SD). b The expression profiles of CO, FT, and AP1 homologs during the seedling development of wild and domesticated soybeans under SD. DAG: days after germination. Flowering time is indicated by a red arrow. Both Gs (ZYD03294) and Gm (ZDD22648) flowered around DAG33. c The expression of GIa, GIb, and GIc in wild (32 accessions) and domesticated (32 accessions) populations (Additional file 1: Dataset S1) were investigated using qRT-PCR. Only GIa haplotypes were indicated as red, green, and blue for H1, H2, and H3, respectively. Others in wild soybeans are in gray. The flowering time (vertical columns) was recorded as the days from germination to the appearance of the first flower bud. The correlation coefficient between the flowering time and the GI expression in wild and domesticated populations is shown. Gm, G. max; Gs, G. soja