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Figure 7 | EvoDevo

Figure 7

From: The Hox genes Ultrabithorax and abdominal-A specify three different types of abdominal appendage in the springtail Orchesella cincta (Collembola)

Figure 7

Schematic summary of Oc-Ubx and Oc-abd-A knockdown experiments in Orchesella . The boxes represent the thoracic (T1 to T3) and abdominal (A1 to A6) segments. Blue and grey shading represent Oc-Ubx expression and Oc-abd-A expression, respectively (examined by in-situ hybridization on wild type, control and knockdown embryos). The appendage buds in which only Oc-Ubx is expressed develop into the collophore, the buds in which only Oc-abd-A is expressed develop into the furca, and the buds in which both Oc-Ubx and Oc-abd-A are expressed develop into the retinaculum. When neither Oc-Ubx nor Oc-abd-A is expressed, the appendage has a leg identity. The appendages on A3 are smaller, such as the furca in Oc-abd-A(RNAi), and may be missing distal parts, such as the 'legs’ in the double Oc-Ubx + Oc-abd-A(RNAi). The A2 segment never develops appendage buds. wt, wildtype.

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