Fig. 6: Schematic representation of the mechanism through which GR regulates GvTcR through light.

The transcription of GR is increased in the presence of light, thereby suppressing GvTcR expression. The target genes of GvTcR, ABC transporter ATP binding protein, and self-regulation are suppressed and a sufficient number of GRs are present to maintain energy production function. Under dark conditions, the transcription of GR does not increase; however, the existing GRs regulate the gene expression of GvTcR.