Figure 3.
Example of potential transcriptional epistasis in maize hybrids. A potential example of transcriptional epistasis in maize is illustrated using genes from the well-characterized anthocyanin biosynthesis pathway. Inbred 1 (genotype B, pl, A1, A2, Bz1) and Inbred 2 (genotype b, Pl, A1, A2, Bz1) each contains a nonfunctional allele for one of the regulatory genes B or Pl, and both show negligible levels of expression for the structural genes A1, A2, and Bz1. The hybrid shows additive expression for B and Pl but nonadditive, over-high-parent expression for A1, A2, and Bz1.
