Fig. 5

Schematic regulatory models of trichome formation models for peach and nectarine accessions. Regulatory control of trichrome formation at transcriptomic level for peach, the 'Tainung No.7-HongLin' (TN7) and 'Tainung No.11-XingTao' (TN11), and nectarine, the 'Sunraycer' (Sr) and 'Maravilha Nectarine Mutant' (MN) were illustrated. The TN7 with GG genotype expressed functional PpMYB25 manifested normal trichome formation. Ever though insertion of transposon (black rectangle) in one chromosome of the TN11 resulted in loss of function of the PpMYB25, expression of the remaining functional PpMYB25 led to normal trichome formation. For Sunraycer with gg genotype, both PpMYB25 possessed transposon insertion and contributed to no expression of PpMYB25. Putative epigenetic regulation was proposed to block the expression of the functional PpMYB25 for the MN with Gg genotype, therefore no trichome formation was observed