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The mitogen-activated protein kinase (MAPK) cascades, which play crucial roles in plant development processes, are universal modules of signal transduction in eukaryotes and consist of a core module of three sequentially phosphorylated kinases: MAPK, MAPK kinase (MAPKK), and MAPKK kinase (MAPKKK). This is the first report on the identification and analysis of MAPK cascades in  Eucommia ulmoides . We conducted a genome-wide screening and identified 13 EuMAPKs, five EuMAPKKs, and 57 EuMAPKKKs. The construction of phylogenetic trees revealed that EuMAPKs and EuMAPKKs were divided into four groups (A, B, C, and D), and EuMAPKKKs were divided into three subfamilies (MEKK, RAF, and ZIK). These subfamilies were further confirmed by conserved domain/motif analysis and gene structure analysis. Based on the expression profiles of all identified EuMAPK cascades in various organs at different developmental stages, three genes ( EuRAF22-2 ,  EuRAF34-1 , and  EuRAF33-2 ) with stable expression patterns at all stages of fruit or leaf development, three genes ( EuRAF2-3 ,  EuMPK11 , and  EuMEKK21 ) with differential expression patterns, and two highly expressed genes ( EuZIK1  and  EuMKK2 ) were screened and validated by qRT-PCR. Overall, our results could be used for further research on the precise role of MAPK cascades during organ development in  E. ulmoides .

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Genome-Wide Identification of Mitogen-activated Protein Kinase Cascade Genes and Transcriptional Profiling Analysis during Organ Development in Eucommia ulmoides