Table 2.

Membrane-bound lectin-type PRRs involved in plant defense signaling and symbiosis.

PRR	Plant species	Ligand	Reference
LysM-RLK type
AtCERK1	Arabidopsis thaliana	Chitin	Miya et al. (2007), Brotman et al. (2012)
AtLYK3	A. thaliana	Chitin	Paparella et al. (2014)
AtLYK4	A. thaliana	Chitin	Wan et al. (2012)
OsCERK1	Oryza sativa	Chitin (when in combination with OsCEBiP)	Kaku et al. (2006)
NFR1	Lotus japonicus	Lipochitooligosaccharide Nod factors	Radutoiu et al. (2003)
LYK3	Medicago truncatula	Lipochitooligosaccharide Nod factors	Knogge and Scheel (2006)
NFR5	L. japonicus	Lipochitooligosaccharide Nod factors	Radutoiu et al. (2003), Madsen et al. (2003)
SYM10	Pisum sativum	Lipochitooligosaccharide Nod factors?	Madsen et al. (2003)
LYK4	M. truncatula	Lipochitooligosaccharide Nod factors	Limpens et al. (2003)
NFP	M. truncatula	Lipochitooligosaccharide Nod factors	Mulder et al. (2006)
LysM-RLP type
LYM1/AtLYP2, LYM3/AtLYP3	A. thaliana	Peptidoglycan	Willmann et al. (2011), Tanaka et al. (2013)
OsCEBiP	O. sativa	Chitin	Shimizu et al. (2010)
OsLYP4, OsLYP6	O. sativa	Chitin + Peptidoglycan	Liu et al. (2012a)