Table 1.

Initial hypothesized function of Populus lysin motif receptor-like kinases (LysM-RLKs) based on phylogenetic relatedness with functionally characterized LysM-RLKs from other plant species.

Poplar LysM-RLK		Phylogenetic Analysis
Gene ID	Protein name	Closest homolog(s)	Hypothesized function
Potri.002G226600	PtCERK1-like1	MtLYK9	CO perception, dual role in immune and symbiotic signaling[25]
Potri.014G156400	PtCERK1-like2	MtLYK9	CO perception, dual role in immune and symbiotic signaling[25]
Potri.011G010000	PtCERK1-like3	MtLYK9	CO perception, dual role in immune and symbiotic signaling[25]
Potri.001G332800	PtLYK2-like1	AtLYK2	CO perception, elicitor‐induced resistance to pathogens[108]
Potri.T115100	PtLYK-like2	AtLYK2	CO perception, elicitor‐induced resistance to pathogens[108]
Potri.001G190200	PtLYK3-like	AtLYK3	LCO-induced suppression of the innate immune response[71]
Potri.007G032100	PtLYK4-like1	AtLYK4, MtLYR3	AtLYK4: CO perception[22]; MtLYR3: LCO perception[59]
Potri.005G128200	PtLYK4-like2	AtLYK4, MtLYR3	AtLYK4: CO perception[22]; MtLYR3: LCO perception[59]
Potri.005G259600	PtLYK5-like1	AtLYK5	CO perception, interacts with CERK1 during immune signaling[21]
Potri.002G001600	PtLYK5-like2	AtLYK5	CO perception, interacts with CERK1 during immune signaling[21]
Potri.005G128400	PtNFP-like1	MtNFP	LCO perception, direct role in symbiotic signaling[33], [53]
Potri.007G032300	PtNFP-like2	MtNFP	LCO perception, direct role in symbiotic signaling[33], [53]