The success of plant genetic transformation relies greatly on the strength and specificity of the promoters used to drive genes of interest. In this study, we analyzed gfp gene expression mediated by a polyubiquitin promoter (Gmubi) from soybean (Glycine max) in stably transformed soybean tissues. Strong GFP expression was observed in stably transformed proliferative embryogenic tissues. In whole transgenic plants, GFP expression was observed in root tips, main and lateral roots, cotyledons and plumules in young plants as well as in leaf veins, petioles, flower petals, pollen, pods and developing seeds in mature plants. GFP expression was localized mainly in epidermal cells, leaf mesophyll, procambium and vascular tissues. Introduction of an intron-less version of the Gmubi promoter (Gmupri) displayed almost the same GFP expression pattern albeit at lower intensities. The Gmubi promoter showed high levels of constitutive expression and represents an alternative to viral promoters for driving gene expression in soybean.
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