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. 2022 Feb 28;189(2):628–643. doi: 10.1093/plphys/kiac088

Figure 8.

Figure 8

Summary of the antagonistic bHLH/HLH system that regulates fiber elongation in cotton. GhPRE1/5, GhFP1, and GhIBH2/3 form triantagonistic system to regulate BR biosynthesis. GhBZR1 is activated by BR signaling and suppresses the transcription of GhFP2 directly, preventing GhFP2 from forming heterodimers with GhACE1. Therefore, free GhACE1 proteins form homodimers to directly activate the transcription of target genes, including GhPIP2;7 and GhEXP8, for promoting fiber elongation of cotton.