*3.6. Arsenic Bioaccumulation and Translocation Factors*

All the bioaccumulation and translocation factors proved to be higher under the control growing conditions, displaying a sharp decrease in response to the As+ treatment (Table 6). Shifting from As− to As+, the strongest BAFroot reduction was found in "Proteo" and "Magnus" (−5646.22 and −5394.68, respectively, corresponding to −95% and −93%), while the least one in "Dinero" and "RS841" (−3260.82 and −3033.38, respectively, corresponding to −92% and −97%) (Table 6). Differently, "Dinero" caused the sharper BAFshoot decrease in response to As+ treatment (−422.82, i.e., −98%), followed by "Magnus" (−377.37, i.e., −98%), while "Shintoza" generated the smallest variation (−229.6, i.e.,

−97%) (Table 6). With reference to BAFpulp, "Proteo" and "Strong Tosa" generated the strongest drop in response to As+ (by −426.92 and −298.47, respectively, corresponding to −99.8% and −99.7%), whereas a less marked decrease was recorded when "Proteo" was grafted onto "Shintoza" (−150.45, i.e., −99.4%), "RS841" (−145.92; i.e., −99.5%) and "Dinero" (−68.05, i.e.; −98.8%) (Table 6). The increase in As concentration in the root environment caused the highest TFshoot reductions in "Proteo" grafted onto "Dinero" (−0.097; i.e., −80.2%) and "Magnus" (−0.051, i.e., −77.3%), while the least ones in the grafting combinations "Proteo"/"Shintoza" (−0.025; i.e., −43.1%) and "Proteo"/"RS841" (−0.024; i.e., −25.3%) (Table 6). "Strong Tosa", "Magnus" and "Shintoza" proved the highest TFpulp reduction in response to the As stress (−0.069, −0.038, and −0.032, respectively, corresponding to −94.5%, −95.0%, and −86.5%), whereas "Dinero" showed the least one (−0.007; i.e., −84.2%) (Table 6).


**Table 6.** Arsenic bioaccumulation and translocation factors (adimensional) in shoot and pulp of melon plants as affected by As concentration in the nutrient solution and rootstock. Different letters within main factors indicate significance at Fisher's LSD test (*p* = 0.05).
