Figure 8.

Pearson correlation heatmap showing the relationship among different observed variables for Brassica juncea plants. The treatments included control, heat stress (HS), sulfur (S), melatonin, HS + S, melatonin + HS, and melatonin + S + HS. The variables included methionine (Meth), ethylene (Eth), 1-aminocyclopropane carboxylic acid synthase (ACS), thiobarbituric acid reactive substances (TBARS), hydrogen peroxide (H₂O₂), superoxide dismutase (SOD), glutathione reductase (GR), ascorbate peroxidase (APX), reduced glutathione (GSH), cysteine (Cys), ATP-sulfurylase (ATP-S), serine acetyltransferase (SAT), Rubisco activity, root S, leaf S, sulfate transport index (STI), net photosynthesis (Pn), stomatal conductance (gs), intercellular CO₂ concentration (Ci), photosynthetic-S use efficiency (p-SUE), plant dry mass (PDM), and leaf area (LA).