Fig. 3: Cu levels and distribution shown as μ-XRF elemental maps of the roots and leaves of transgenic plants overexpressing MdWRKY11 and an untransformed control plant treated with 500 μM CuSO4 for 24 h.

a Cu level and distribution depicted as μ-XRF elemental maps of the roots. VC vascular cylinder, EN endodermis, EP epidermis. b Cu level and distribution shown as μ-XRF elemental maps of leaves