Fig. 7: Model HvYDA1 and HvBRX-Solo functions in barley epidermal features.
From: Conserved signalling components coordinate epidermal patterning and cuticle deposition in barley
During epidermal development, protodermal cells undergo an asymmetric cell division to generate a specialised cell specific to the cell file identity (stomata, silica, prickle hair) and an epidermal pavement cell. HvYDA1 and HvBRX-Solo proteins reinforce asymmetric cell fate dictated by the lineage cues to prevent specialised fate in the epidermal pavement cell. HvYDA1 and HvBRX-Solo also control the cuticle properties in epidermal tissues. Both cell fate and cuticle development may interact with each other such that an incomplete or un-reinforced epidermal identity directly impacts the cuticular properties and vice versa. In this way HvYDA1 and HxBRX-Solo may mechanistically coordinate diverse epidermal features to ensure that emerging cuticle properties develop in step with cell specification, elongation and maturation. These activities may be important to explain the HvBRX-Solo and HvYDA1 control of DKS-derived aliphatic wax blooms in barley later in development.
