Figure 8.

CF movement is normal in the transport and release phloem of tdy1 mutants. A to C, G to I, M to O, and S to U, Wild type. D to F, J to L, P to R, and V to X, tdy1-R mutant. A, D, G, J, M, P, S, and V, Transverse sections under bright field. B, E, H, K, N, Q, T, and W, Same sections under UV illumination showing cellular anatomy. C, F, I, L, O, R, U, and X, Same sections under blue light to image CF fluorescence. A to F, Leaf sheath of CF-fed leaf. G to L, Mature root above the zone of differentiation. M to R, Immature sink leaf enclosed in the whorl. S to X, Root cross-sections in the unloading domain determined by CF diffusion into cortex cells. Bars = 100 μm. [See online article for color version of this figure.]