Plant growth is regulated by a multiplicity of factors, many of which are transduced via hormone signaling. However, how these hormone signals converge to affect growth is not entirely clear (reviewed in Depuydt and Hardtke, 2011). New work from Ikeda et al. (pages 4483–4497, November 2012) and Bai et al. (pages 4917–4929) demonstrates that the cell elongation component of growth is regulated by a mechanism involving groups of three basic helix-loop-helix (bHLH) transcription factors (some of which lack the basic domain).
Via Jennifer Mach, Andres Zurita