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. 2022 Nov 23;13:1062603. doi: 10.3389/fpls.2022.1062603

Figure 4.

Figure 4

Different metabolites involved in vitamin metabolism, lipid metabolism, amino acid metabolism and carbohydrate metabolism in maize grain between the humic acid and control treatments. Color changes represent the corresponding metabolite abundances. Red, up-regulated abundance (P < 0.05); light red, up-regulated abundance (0.01 < P < 0.05); black, no significant difference; light green, down-regulated abundance (0.01 < P < 0.05); green, down-regulated abundance (P < 0.05).