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Table 1 Group and subgroup designations of LRR-RLK proteins from Populus trichocarpa

From: Genome-wide identification, characterization and expression analysis of populusleucine-rich repeat receptor-like protein kinase genes

Groups Subgroups Gene number PI MW(kDa) aa length With signal peptide Homologous Arabidopsisgenes based on LRR
I a 16 5.29-7.94 43.32-104.52 391-934 56.3% FRK1, IOS1, MEE39
b 17 5.24-8.86 49.58-101.98 455-923 58.8% FEI1-2, TMKL1
II   29 5.19-9.45 68.92-79.48 564-715   NIK1, NIK2, SARK,NIK3, SERK1-5, MRH1
III   29 5.85-9.19 59.07-74.62 547-684 65.5% RLK902, RKL1, RUL1, PRK2A
IV   20 5.43-8.66 59.51-132.35 546-1211   IMK2, IMK3
V   11 5.82-8.03 67.75-86.62 625-794 54.6% SRF1-8, SCM
VI   16 5.68-9.21 74.95-114.81 673-1072   
VII a 6 5.22-8.72 74.08-133.71 673-1221 83.3%  
b 30 6.11-8.67 66.14-128.21 599-1162 30.0% Populus -specific
VIII   17 5.29-8.16 48.97-106.77 449-978 58.8%  
IX   12 5.31-6.68 98.97-103.46 908-949 100%  
X   29 5.22-8.77 49.72-130.50 446-1205 82.8% BIR1, PSKR2, PSKR1,BRL2, BRI1, BRL1,BRL3
XI a 28 5.15-8.03 77.44-113.17 701-1026 85.7% HAESA, XIP1, HAIKU2, RLK7, PXY, BAM1-3, CLV1, MOL1
b 20 5.33-6.06 96.55-136.72 870-1254 55.0% GSO1-2, EDA23, ERL1-2, ERECTA
c 7 5.94-8.68 96.63-127.25 887-1145 100.0% PEPR1-2
XII a 23 5.22-8.56 85.98-126.86 783-1158 60.9% FLS2, EFR
b 19 5.61-8.44 53.24-115.95 489-1067 52.6% Populus -specific
XIII   34 5.00-9.14 62.81-135.28 565-1605 47.1% MEE62, TOAD1-2
XIV   10 5.42-8.95 63.75-134.48 574-1237 30.0% EMS1
  1. Sequence characteristics of each PtLRR-RLK gene subfamily and its phylogenetic relationship with Arabidopsis LRR-RLKs with known functions are shown. Six PtLRR-RLK proteins did not fit well into clusters. Subgroups that do not include any Arabidopsis LRR-RLK proteins are described as Populus-specific. Information on the AGI code, gene full-name and abbreviation for each AtLRR-RLK gene with defined functions is presented in the Additional file 18.