Fig. 10: Model explaining how GCR1/2 spatiotemporally regulates the gland formation in plants.
From: Spatiotemporal formation of glands in plants is modulated by MYB-like transcription factors
a Trichome is an age-dependent feature in tomato. Trichomes appeared to be all glandular types including DGT and PGT at the juvenile stage (The second SEM image). In contrast, trichomes formed in adult plants include both NGT and PGT (The third image). However, forced expression of GCR1 in trichome apical cells inhibited the gland formation (The first image). In contrast, when both GCR1 and 2 were knocked out, supernumerary glands formed throughout the all developmental stages (The forth image). Bar: 50 μm. b The formation of glandular and non-glandular trichomes relies on the spatiotemporal expression of GCR1/2. Both genes were highly expressed in apical cells of NGT, but low expression in the apical cells of GT. This spatiotemporal expression of GCR1/2 results from a combination of self-inhibition and SlTOE1B induced inhibition. Once the GCR1/2 expression was significantly reduced, LFS was activated, which leads to the formation of gland heads. Both phase-related signals miR156 and SlTOE1B promotes glandular trichome formation.
