Fig 7. Amount of gene transcripts of the biosynthetic pathway of phytochelatins synthase (PCs); cytoplasmic superoxide dismutase (SODCyt) and peroxidase (PER-1) in leaves and roots of T. cacao progenies.

Catongo (A), (C) and (E), and CCN-10 x SCA-6 (B), (D) and (F) exposed to increasing of Pb doses. The mRNA levels were quantified by quantitative real-time PCR. The mRNA levels were normalized in respect to tubulin, and are expressed relatively to those of control plants that were given a value of 1. Mean values of Intraprogenies followed by the same lowercase letters do not differ by Tukey test (p <0.05). Mean values of six replicates (± SE).