MYC2 regulates , a component of cytokinin signaling pathways, in Arabidopsis seedling development.

MYC2 is a basic helix-loop-helix transcription factor that acts as a repressor of blue light-mediated photomorphogenic growth; however, it promotes lateral root formation. MYC2 also regulates different phytohormone-signaling pathways in crucial manner. Arabidopsis response regulator 16 () is a negative regulator of cytokinin signaling pathways.

Enhancement of ABA Sensitivity Through Conditional Expression of the Gene in Reveals Fertile Plants with Tolerance Against .

Concomitant increase of auxin-responsive factors , along with enhanced expression of in resistant compared with that in susceptible upon challenge with , revealed that abscisic acid (ABA)-auxin crosstalk is a critical factor for resistance response. Here, we induced the ABA response through conditional expression of in using the -inducible promoter. Induced ABA sensitivity caused by conditional expression of ARF10 in transgenic resulted in tolerance against and led to enhanced expression of several ABA-responsive genes without affecting the auxin biosynthetic gene expression.

Functional interrelation of MYC2 and HY5 plays an important role in Arabidopsis seedling development.

Arabidopsis MYC2 bHLH transcription factor plays a negative regulatory role in blue light (BL)-mediated seedling development. HY5 bZIP protein works as a positive regulator of multiple wavelengths of light and promotes photomorphogenesis. Both MYC2 and HY5, belonging to two different classes of transcription factors, are the integrators of multiple signaling pathways.