Figure 1.

A schematic tree showing the relationships among members of the TCP family mentioned in this article. Class I TCPs are shown in pink, while members of class II are divided into three groups: CIN (cyan), TB1 (orange), and CYC (purple). Note the presence of two different groups of CIN TCPs: those that are targets and those that are not targets of miR319 (AtTCP5, AtTCP13, and AtTCP17 belong to this last group). In addition, note that CYC and TB1 groups actually belong to the same clade, named CYC/TB1 or ECE, which is separated here as a result of the specific members that were selected. In fact, the group named CYC contains essentially members of the CYC2 clade that evolved in dicots and is related to floral symmetry (see Section 3 for details), while the group named TB1 contains members of the CYC/TB1 groups 18, 19, and 20 that evolved in grasses and are related to inflorescence architecture, in addition to shoot branching, together with A. thaliana BRC1 (see Section 6 for details). Species abbreviations are Am, Antirrhinum majus; At, Arabidopsis thaliana; Gh, Gerbera hybrida; Ha, Helianthus annuus; Hv, Hordeum vulgare; Ia, Iberis amara; Os, Oryza sativa; Sb, Sorghum bicolor; Sl, Solanum lycopersicum; Ss, Sinningia speciosa; Ta, Triticum aestivum; Tf, Torenia fournieri; Zm, Zea mays. Full-length protein sequences were aligned with Clustal Omega (https://www.ebi.ac.uk/Tools/msa/clustalo/, accessed on 18 November 2022) and used to construct the tree using the Neighbor-Joining method. Bootstrap analysis was not performed. The tree was displayed using iTOL (https://itol.embl.de/itol.cgi, accessed on 19 April 2023). The node of class I TCPs was used as the root for better visualization. For further details about the phylogeny of TCP proteins, the reader is referred to recently published papers [5,8].