Nevertheless, the CYN detected in the leaves of rice plants suggests a process of cyanotoxin transport through the vascular system with an uptake at the root level via plasma membrane and symplastic transport, allowing the cross of the endodermis barrier. Plants have been shown to up-take and partition organic forms of nitrogen (N) such as amino acids, peptides and proteins (Tegeder and Rentsch, 2010). These compounds may be regarded as additional N sources, especially in conditions of limited availability of this element (Tegeder and Rentsch, 2010). Families of protein transporters, with different specificities, have been discovered playing a crucial role in these plant capabilities (Tegeder and Rentsch, 2010). Thereby it should be considered the possibility of CYN accumulation in plant tissues involving similar transport systems.