Figure 4.

Histochemical staining of FSP046::GUS transgenic A. thaliana plants. There is no GUS staining in the two-leaf stage (a), six-leaf stage (b), rosette leaf (c), flower bud (d), silique (i), or seed (j). GUS activity driven by the FSP046 promoter was observed in flowers one day before blooming (e), flowers at the blooming day (f), petals one day after blooming (g), and petals two days after blooming (h). Moreover, there is the highest GUS activity in the stamen/stigma (f), and less activity in the petals (f–h). Bar = 1 mm