Table 1.

Genes involved in trichome and root hair initiation

Locus	Gene product	Wild-type expression profile	Function
GL1	Myb transcription factor	Young leaf primordia and developing trichomes	Promotes trichome initiation
WER	Myb transcription factor	Non-root-hair (N) cells	Prevents root-hair (H)-cell initiation
GL3	Myc transcription factor	Not well characterized	Promotes trichome initiation
TTG	WD-40 repeat	Not well characterized	Promotes trichome initiation and prevents H-cell initiation
CPC	Myb transcription factor	Young leaf primordia and developing trichomes and N cells	Limits trichome initiation and promotes H-cell initiation
TRY	Myb transcription factor	Young leaf primordia and developing trichomes and weakly expressed in roots	Prevents trichome clustering