Figure 4.

Auxin-DELLA interaction during low blue light-induced hypocotyl elongation. A to F, Inhibition of auxin transport (NPA) prevents low blue light-induced DELLA degradation, and this is overcome by the addition of GA, as evidenced by the pRGA∷GFP:RGA reporter. G, NPA effects under standard and low blue light conditions on hypocotyl length in the quadruple DELLA knockout mutant and the DELLA gain-of-function mutant gai. Data are means ± se (n = 30–50). Different letters indicate significant differences.