Basic characteristic analysis of 429 LecRKs. (a) Typical domain architectures of C-, L- and G- type LecRKs. Protein number of each architecture was presented behind the sequence. Six main domains, including calcium-dependent lectin (C-lectin), legume-lectin (L-lectin), bulb-lectin (G-lectin), kinase, plasminogen/apple/nematode (PAN) and S-locus, were marked concurrently in different colors; (b) The number of amino acids predicted for three types of LecRKs. (c) Phylogenetic tree analysis of 314 LecRKs with complete kinase domains indicates three types of LecRK proteins segregated distinctly with independent evolutionary branches.