Figure 3. Samples from 10 dpa soybean pods and seeds are negative for the presence of HPS.

(A) Bright field micrograph of transverse section through pod and developing seed, stained with Toluidine blue O. This is the typical orientation for sample sectioning. Bar = 20 μm. (B) Transmission electron micrograph of endocarp epidermis, showing a portion of the outer tangential wall and radial wall, after probing with monoclonal antibody to HPS and immunogold labelling. Bar = 2 μm. (C) Transmission electron micrograph of the palisade layer. The cytoplasm is dense with organelles and the vacuoles are still small and not yet coalesced into a single central vacuole. Bar = 500 nm. (D) Higher magnification view of endocarp epidermis after probing with monoclonal antibody to HPS and immunogold labelling, showing unlabelled deposits. Bar = 500 nm. ep, endocarp epidermis; f, funiculus; n, nucleus; p, pod wall; pa, endocarp parenchyma; s, seed; st, starch grain; v, vacuole; w, cell wall.