Soil and foliar zinc application to biofortify broccoli (“Brassica oleracea” var. “italica” L.): effects on the zinc concentration and bioavailability
Rivera Martín, Angélica María | Broadley, Martin R. | Poblaciones Suárez-Bárcena, María José | University of Nottingham. UK | Universidad de Extremadura. Departamento de Ingeniería del Medio Agronómico y Forestal
Agronomic zinc (Zn) biofortification of crops could help to alleviate dietary Zn deficiency, which is likely to affect more than one billion people worldwide. To evaluate the efficiency of agronomic Zn biofortification of broccoli, four application treatments were tested: no Zn application (control); soil application of 5 mg/kg ZnSO4·7 H2O (soil); two sprays (15 mL/pot each) of 0.25% (w/v) ZnSO4·7 H2O (foliar); and soil + foliar combination. Soil Zn application increased Zn-DTPA (diethylenetriamine pentaacetic acid) concentration by 3.7-times but did not affect plant growth or plant Zn concentration. Foliar Zn application increased stem + leaves and floret Zn concentration by 78 and 23 mg Zn/kg, respectively, with good bioavailability based on phytic acid concentration. Boiling decreased mineral concentration by 19%, but increased bioavailability by decreasing the phytic acid concentration. The entire broccoli could constitute a good nutritional source for animals and humans. An intake of 100 g boiled florets treated with the foliar treatment will cover about 36% of recommended dietary intake (RDI) of Zn, together with 30% of Ca, 94% of K, 32% of Mg, 6% of Na, 55% of P, 60% of S, 10% of Cu, 22% of Fe, 43% of Mn, and 35% of Se RDIs.
Показать больше [+] Меньше [-]The authors would like to acknowledge the financial support provided by the Extremadura Education and Employment Counselling (Program: mobility grants for teaching and research staff, ref 31) during Dr. Poblaciones’s stay in the School of Biosciences at the University of Nottingham.
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