Figure 4.

Two scenarios can explain eQTLs with opposite effect in GG1 and GG2. The level of expression of a given gene in Ler (red) and Cvi (blue) is indicated by the arrow, indicating low (thin arrow) or high (thick arrow) promoter activity resulting in a low or high level of transcript (indicated by the waving lines). (A) gene expression in Ler is unchanged, but in Cvi it is plastically regulated. (B) gene expression is plastically regulated in both Ler and Cvi, but activation of expression is stronger in GG1 of the Cvi allele and in GG2 of the Ler allele.