Figure 5From: Switchgrass (Panicum virgatum L.) polyubiquitin gene (PvUbi1 and PvUbi2) promoters for use in plant transformationHistochemical staining of GUS in tobacco seedlings driven by the 2x35S (A, E, I), PvUbi2 (B, F, J), PvUbi2+3 (C, G, K) and PvUbi2+9 (D, H, L) promoters. Staining was performed at 10 days (A, B, C, D) and 17 days (E, F, G, H) post-germination. Heat shock was also performed at 17 days post-germination (I, J, K, L). Each measurement bar represents 5 mm.Back to article page