Shoot apex, leaf primordia, leaf sections and roots from Mexican prickly poppy seedlings, were inoculated with Agrobacterium tumefaciens
harboring the binary vector pCAMBIA2301, which contained the β-glucuronidase (uid A) gene. Histochemical β-glucuronidase (GUS) assay in infected explants showed transient gus gene expression between 3 and 12 days after inoculation. To our knowledge, this is the first report of A. mexicana
susceptibility to A. tumefaciens
-mediated genetic transformation.