Figure 1.

Grafting shows flavonoid movement occurs across grafts. Reciprocal grafting between wild type and tt4 indicated flavonoid movement from the flavonoid producing tissue to the chalcone synthase-deficient tissue. The order of the graft is indicated by the left legend as aerial tissue over root tissue in the graft. Micrographs are DPBA stained tissue excited with 488 nm wavelength. The tt4/tt4 control graft shows no flavonoids are present, even though a wound has occurred on the leaf which generally exacerbates flavonoid fluorescence. Scale bar = 100 µm. Green fluorescence is from kaempferol and gold from quercetin. The red fluorescence is from chlorophyll.