Fig. 4

ImpulseDE2 profiles for developing cotton fibers (6 DPA through 24 DPA). Categories include genes whose expression transition up (up, Tr-Up); transition down (down; Tr-Down); impulse up (*up, Im-Up); or impulse down (*down; Im-Down). Colors reflect relative expression levels, where blue indicates lower expression and red indicates higher expression. Bars at the top of the diagram indicate the phase in fiber development covered by those DPA, i.e., PCW synthesis to support rapid elongation, transitional CW remodeling, and SCW synthesis. Vertical black lines indicate the 9–10 and 16–17 DPA gaps from the PCA that also exhibit the most adjacent DPA expression changes