Fe2+, Mg2+ and Mn2+ are enzyme cofactors in terpenoids biosynthesis. Effects of pre-harvest spray of FeSO4, MgSO4 and MnSO4 (0.2% and 0.3%) 30 d prior to harvest on the levels of terpenoids and phenolic compounds in ripe mango fruit were investigated. All treatments significantly increased lupeol in the peel compared to control and it was highest in pulp of 0.3% FeSO4-treated fruit. Spray of each nutrient (0.3%) increased total carotenoids in the pulp. Mangiferin in pulp was significantly higher in the fruit treated with 0.2% FeSO4, MgSO4 and MnSO4 compared to control and 0.3%. Concentrations of gallic, ferulic and caffeic acids in the peel and chlorogenic acid in pulp and peel were highest in fruit sprayed with 0.2% FeSO4. In conclusion, pre-harvest spray of FeSO4, MgSO4 and MnSO4 regulates concentrations of terpenoids and phenolic compounds in the pulp and peel of ripe mango fruit.
Keywords: Ascorbic acid (PubChem CID: 54670067); Caffeic acid (PubChem CID: 689043); Chlorogenic acid (PubChem CID: 1794427); Fe(2+); Ferulic acid (PubChem CID: 445858); Gallic acid (PubChem CID: 370); Health-promoting compounds; Lupeol (PubChem CID: 259846); Mangifera indica L.; Mangiferin (PubChem CID: 5281647); Mg(2+); Mn(2+); Terpenoid biosynthesis; Vanillic acid (PubChem CID: 8468).
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