Fig. 1.

The conserved domain and phylogenetic analysis of NAC proteins in cotton. a Schematic representation of NAC proteins. (i) Typical NAC protein with a highly conserved NAC domain (A-E subdomains) at the N-terminal; (ii) Membrane-bound NAC transcription factors with a transmembrane motif (TM, blue square) at the C-terminal; (iii) Membrane-bound NAC transcription factors with a transmembrane motif (TM, blue square) at the N-terminal. b Phylogenetic tree of NAC proteins in four cotton species. G. hirsutum (red circle), G. barbadense (green square), G. raimondii (blue triangle), G. arboreum (magenta triangle)