Figure 7.

GUS expression in tobacco plants transformed with the dhs-promoter GUS fusion. A, Young seedling with stained root and hypocotyl. B, Detail of the transition between root and shoot of a seedling shown in C. C, Seedlings with developed cotyledons, one with two primary leaves. D, Young plant with GUS expression in the cotyledons, successive leaves, the hypocotyl, and some of the roots. Older leaves only show weak GUS expression. E, Adventitious roots of an F₀ plant, of which only some show GUS expression in a section of approximately 0.5 to 1.0 cm in length directly behind the root tips.