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. 2015 Apr 2;7:39. doi: 10.12703/P7-39

Figure 3. Timeline of appearance of ethylene receptor gene family members in plants.

Figure 3.

The ethylene receptor genes in the lower and higher plant species indicated are shown along a timeline of plant evolution from bottom to top. Transmembrane domains (green), GAF domain (pink), His kinase domain (purple), and receiver domain (blue) are indicated. The number of genes represents the size of the receptor gene family for each species. Yellow asterisks indicate the conserved motifs of the His kinase and receiver domains. ETR1-like receptors contain the conserved motifs of the His kinase domain and a receiver domain. ERS1-like receptors contain the conserved motifs of the His kinase domain but lack a receiver domain. EIN4-like and ETR2-like receptors lack most or all of the conserved motifs of the His kinase domain but contain a receiver domain. EIN, ethylene insensitive; ERS, ethylene response sensor; ETR, ethylene response; GAF, cGMP-specific phosphodiesterases, adenylyl cyclases and FhlA; His, histidine.