Figure 8.

A, Supplemental GL antagonizes blue and red light inhibition of hypocotyl elongation. Seedlings were planted and grown in darkness as described in “Materials and Methods.” Etiolated seedlings (36–40 h old) were irradiated under LED banks generating approximately equal amounts of blue and red light (RB) or the same RB treatment supplemented with an equal quanta of GL (RBG). A significant difference was observed 96 h postgermination. Dark-grown seedlings were measured for comparison. At least 40 individual seedlings were measured in each of two completely independent replicates. B, The emission spectra of red and blue (RB; black trace), and red and blue with supplemental green (RB + G; gray trace) used to obtain the results from A are presented.