Table 1    Established SERK-interacting proteins in ArabidopsisGene locus Protein name Validation       Physiological       function       Reference       At4g39400 BRI1 Co-IP BR signaling and plant growth (Li et al., 2002; Nam and Li, 2002) At1g55610 BRL1 Co-IP BR signaling and root growth (Fabregas et al., 2013) At3g13380 BRL3 Co-IP BR signaling and root growth (Fabregas et al., 2013) At3g21640                TWD1                    Co-IP                BR                signaling                (Chaiwanon et al., 2016; Zhao et al., 2016) At2g02220 PSKR1 Co-IP PSK signaling and root growth (Wang et al., 2015a) At2g26330 ERECTA Co-IP EPF signaling and stomatal patterning (Meng et al., 2015) At5g62230 ERL1 Co-IP EPF signaling and stomatal patterning (Meng et al., 2015) At4g33950 OST1 BiFC ABA signaling and stomatal closure (Shang et al., 2015) At4g26080 ABI1 BiFC ABA signaling and stomatal closure (Shang et al., 2015) At1g80080 TMM Co-IP EPF signaling and stomatal patterning (Meng et al., 2015) At5g46330 FLS2 Co-IP Flg22 signaling and plant defense response (Chinchilla et al., 2007; Heese et al., 2007) At5g20480 EFR Co-IP ELF18 signaling and plant defense response (Roux et al., 2011) At1g73080 PEPR1 Co-IP PEPP signaling and plant defense response (Tang et al., 2015) At5g48380 BIR1 Co-IP Cell death (Wang et al., 2011) At3g28450 BIR2 Co-IP Plant defense response (Halter et al., 2014) At2g39660 BIK1 Co-IP Plant defense response (Lu et al., 2010) At3g46510 PUB13 Co-IP Plant defense response (Zhou et al., 2015) At5g40370                AtGRXC2                Y2H                Glutathionylation (Bender et al., 2015) At1g25490 PP2A-A1 Co-IP Plant defense response (Segonzac et al., 2014) At2g26300 GPA1 BiFC Plant defense response (Aranda-Sicilia et al., 2015) At4g34460 AGB1 BiFC Plant defense response (Aranda-Sicilia et al., 2015) At3g63420 AGG1 BiFC Plant defense response (Aranda-Sicilia et al., 2015) At3g22942 AGG2 BiFC Plant defense response (Aranda-Sicilia et al., 2015) At3g23750                BARK1                  BiFC                Root                development (Kim et al., 2013) At5g61900 BON1 Co-IP cell death   (Wang et al., 2011) At5g52240 MSBP1 Co-IP BR signaling and BAK1 endocytosis (Song et al., 2009) AvrPto Co-IP Suppression of plant immunity   (Shan et al., 2008) AvrPtoB Co-IP Suppression of plant immunity   (Shan et al., 2008) HopF2 Co-IP Suppression of plant immunity (Zhou et al., 2014) 
