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. 2019 Apr 16;20(8):1882. doi: 10.3390/ijms20081882

Table 1.

Many pattern-recognition receptors (PRRs) have been discovered in different plant species. PRRs can be categorized as receptor kinases or receptor-like proteins. Ligand recognition by PRRs leads to Pathogen Associated Molecular Pattern (PAMP)-Triggered Immunity (PTI). This table highlights PRR types along with their ligands/agonists.

Sr. No. Family Plant Source PRR Ligand/Agonist Reference
AT BN LJ NB OL OS SH SL SM SP SI TA VV ZM
Receptor Kinase
1 LRRXII XA21 RaxX [38]
2 FLS2 Flagellin (flg22 epitope) [46]
3 FLS3 Flagellin (flgII-28 epitope) [47]
4 EFR EF-Tu (elf18 epitope) [6]
5 XPS1 Xanthine/uracil permease (xup25 epitope) [48]
6 CORE csp22 [49]
7 LRRXI PEPR1 Pep1-6 [50]
8 PEPR2 Pep1-2 [51]
9 RLK7 PIP1 [52]
10 WAK WAK Oligogalacturonides [52]
11 Snn1/TaWAK SnTox1 [53]
12 LysM AtCERK1 Chitin [54]
13 AtLYK5 Chitin [55]
14 EPR3 Extracellular polysaccharides [56]
Receptor-Like Proteins
15 LRR Cf-2 Rcr3 protease (guarded to detect Avr2 and Gr-VAP1) [57]
16 Cf-4 Avr4 [58]
17 Hcr9-4Eb Avr4E [59]
18 Cf-5 Avr5 [60]
19 Cf-9 HABS (guarded to detect Avr9) [61]
20 Ve1 Ave1 [62]
21 LeEix2 EIX [63]
22 LepR3/RLM2 AvrLm1and AvrLm2 [64]
23 RLP1/ReMAX eMaxc [65]
24 RLP23 nlp20 [66]
25 RLP30 SCFE1c [67]
26 RLP42/RBPG1 EndoPG [68]
27 RLP85/ELR Elicitins [69]
28 CSPR csp22 [70]
29 CuRe1 Cuscuta factorc [71]
30 I Avr1/Six4 [55]
31 LysM OsCEBiP Chitin [72]
32 OsLYP4 and OsLYP6 Peptidoglycans/chitin [73]
33 AtLYM2 Chitin [74]
34 AtLYM1 and AtLYM3 Peptidoglycans [75]
NOTE:
AT Arabidopsis thaliana BN Brassica napus LJ Lotus japonicas NB Nicotiana benthamiana OL Oryza longistaminata OS Oryza sativa SH Solanum hirsutum
SL Solanum lycopersicum SM Solanum microdontum SP Solanum pennellii SI Solanum pimpinellifolium TA Triticum aestivum VV Vitis vinifera ZM Zea mays