Fig. 3.

Interactions between VRN-D4 and other vernalization genes. To facilitate the visualization of the interactions we only included in this figure the plants homozygous for the two vernalization genes segregating in each population. a Interactions between VRN-D4 and VRN-A1. b Interactions between VRN-D4 and VRN-B1. c Interactions between VRN-D4 and VRN-D1. d Interactions between VRN-D4 and VRN-B3. All the interactions were highly significant (P < 0.0001, based on 2 × 3 factorial ANOVAs including homozygous and heterozygous classes for each gene, Table 3)