Root Growth of Transgenic Tobacco Plants with Overexpression of Expansin and Xyloglucan endotransglycosylase Genes under Cadmium Stress

Abstract Expansins and xyloglucan endotransglycosylases play an important role in the regulation of plant growth under optimal stressful conditions. Transgenic tobacco plants overexpressing NtEXPA1 NtEXPA5 expansin genes NtEXGT endotransglycosylase Nicotiana tabacum L. have been previously created by authors. The aim this work was morphophysiological analysis roots these transgenic conditions cadmium stress. were characterized increased root length compared to wild type plants, both when exposed cadmium. area parenchyma cells greater than type, while cell sizes, on contrary, smaller case transgene . Overexpression NtEXPA1, , contributed increase total antioxidant capacity activity ascorbate peroxidases a decrease content proline action In shoots for genes, lower MDA found Thus, it has shown that transgenes stimulating effect stress enhancing expansion positive components system. gene is also involved cadmium, including through