Table 3.

The phytohormones related to trichome development in plants

Hormone		Functional description	References
GA	Positive	GA enhances the expression levels of MYB23, GL1, GL3, and EGL3, but inhibits the expression levels of TRY, ETC1, and ETC2, and positively regulates the number and branching of trichomes.	[72]
CK	Positive	CKs increase trichome formation, regulate C2H2 transcription factors ZFP8 and GIS2 acting downstream of SPY and upstream of GL1.	[48]
SA	Negative	SA decreases both trichome density and number.	[98]
JA	Positive	JA degrades JAZ to release WD-repeat/bHLH/MYB complex and initiate trichome.	[99]
Ethylene	Positive	Ethylene affects trichome branching, Arabidopsis ethylene receptor mutant, etr2–3, has completely unbranched trichomes.	[99]
BR	Positive	-	[100]