What is the Behavior of Tomato Plants when Exposed to Transitional Conditions Between Zinc Sufficiency and Excess?

This study evaluated the impact of Zinc (Zn) doses on biochemical and growth attributes in tomato plants (Solanum lycopersicum L). The plants were cultivated under greenhouse conditions in two agricultural soils Inceptisol and Oxisol. The following doses of Zn were evaluated: Inceptisol: control, 20, 40 and 60 mg kg− 1; Oxisol: control, 40, 80 and 120 mg kg− 1. Mineral contents in aerial parts of plants, gas exchange, SPAD index, superoxide dismutase (SOD) and peroxidase (POD) activity, peroxide content of hydrogen, lipid peroxidation, root growth parameters and shoot and root dry mass production were evaluated. Plants accumulated dose-dependent Zn in their shoot tissues in both soils. This increase in Zn (60 mg Kg− 1) in Inceptisol and (120 mg Kg− 1) in Oxisol inhibited of dry mass production (-19.3