Genetic transformation of plants plays an important role in modern biotechnology. Genetically modified plants are of increasing interest, not only the crop plants, but also as potential natural bioreactors for the production of biopharmaceuticals and other valuable secondary metabolites and recombinant proteins are used in therapy of numerous diseases, as vaccines, diagnostics, and industrial enzymes. Intensive work on the use of transgenic plants in the process of phytoremediation. Recent, but also classical cytochemical techniques and methods are used for the subsequent stages of technology development both genetic transformation of plants, as well as during their implementation. Examples of such uses may be cytochemical analysis methods using the so-called. reporter genes - uidA (Gus), and GFP encoding, respectively, b-glucuronidase (GUS) and green fluorescent protein (GFP).