Table 1. Receptors, coreceptors, and peptides involved in plant development mentioned in this review.

Ligand Name	Ligand Type	Receptor	Subfamily	Coreceptor	Function
Brassinosteroids	Phytohormone	BRI1	LRR X	SERK1, SERK2, BAK1, BKK1	Cell elongation and plant growth
PSK	Sulfated peptide	PSKR1, PSKR2	LRR X	SERK1, SERK2, BAK1	Cell division and cell expansion
PSY1	Sulfated peptide	PSY1R	LRR X	SERK1, SERK2, BAK1	Cell division and cell expansion
RGFs/CLELs/GLVs	Sulfated peptide	RGFR/RGI1 to RGI5	LRR XI	SERK1, SERK2, BAK1, BKK1	Root meristem size
IDA	Hydroxylated peptide	HAE, HSL2	LRR XI	SERK1, SERK2, BAK1, BKK1	Cell separation
EPF1, EPF2, EPFLs	Cys-rich peptide	ER, ERL1, ERL2	LRR XIII	SERK1, SERK2, BAK1	Stomatal development
TPD1	Cys-rich peptide	EMS1/EXS	LRR X	SERK1, SERK2	Tapetum specification
CLE9/10	CLE peptide	HSL1	LRR XI	SERK1, SERK2, BAK1	Stomatal development
TDIF/CLE41/44	CLE peptide	TDR/PXY	LRR XI	SERK1, SERK2, BAK1	Cambium cell proliferation
CLV3	CLE peptide	CLV1, BAM1, BAM2	LRR XI	CIK1, CIK2, CIK3, CIK4	SAM homeostasis
		RPK2	LRR X
Unknown	Unknown	BAM1, BAM2	LRR XI	CIK1, CIK2, CIK3, CIK4	Anther development
Unknown	Unknown	RPK2	LRR X	CIK1, CIK2, CIK3, CIK4	Tapetum specification