The Medicago truncatula DMI2, DMI3, IPD3, CASTER/POLLUX and VAPYRIN sequences were used as queries, as in a previous study39 (link), to search against the genomes and transcriptomes from species listed in Supplementary Table 11 using tBLASTn73 (link). For liverworts and ferns from the 1KP data set32 (link), non-annotated transcriptomes were used as targets, with the longest open reading frame of each contig extracted and translated. For A.filiculoides and S.cucullata, both the annotated gene models and the unannotated scaffolds were used. All hits that matched already annotated gene models were discarded prior to subsequent analyses. No homologues were identified in the two fern genomes for IPD3 and VAPYRIN. Protein sequences for DMI2/SYMRK, DMI3/CCaMK and CASTOR/POLLUX were aligned using MAFFT89 (link). The best substitution model for each alignment (JTT for all alignments) was determined using MEGA6 (ref.124 (link)). Phylogenetic trees were generated using RAxML100 (link) on the CIPRES platform125 , and node support was assessed with 100 rapid bootstrap pseudoreplicates.
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