A) The sequence alignment of different potato SSs together with AgtGS, OsGBSSI and HvSSI. The ClustalW program (Larkin et al., 2007) was used to align the protein sequences. B) A partial alignment of different potato SSs together with AgtGS, OsGBSSI and HvSSI. The logo of conserved motifs was generated by WebLogo (http://weblogo.berkeley.edu/logo.cgi). All the sequences were obtained from EMBL/DDBJ database. stSSI(P93568.1), StSSII(CAA61241.2), StSSIII(Q43846.1), StGBSSI(Q00775.1), OsGBSSI (AK070431) and HvSSI (AAF37876.1).