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Influence of Potassium Nutrition and Exogenous Organic Acids on Iron Uptake by Monocot and Dicot Plants

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Document pages: 15 pages

Abstract: Iron (Fe) is a vital element for the survival and proliferation of allplants; therefore, Fe-biofortification by the application of chemical andorganic fertilizers is being as an effective approach to fight hidden hungerretards the growth and development of crop plants. Two experiments were carriedout to investigate the effect of potassium and exogenous organic acids on ironuptake by two different plants: one ismonocotyledon, maize (Zeamays L.) and the second is dicotolydon pea (Pisum sativum L.) grown under controlled conditions. The seedlings were grown in sand culturein a greenhouse experiment and irrigated with one-tenth strength modifiednutrient solution of Hoagland and Arnon as a base solution (pH 7.5), containingdifferent iron treatments (0, 1, and 5 ppm as FeSO4·7H2O)combined with potassium nutrition (0, 5, 10, and 50 ppm as K2SO4).After 30 days, the best interaction treatment was selected for furtherexperiment including 5.0 ppm Fe as FeSO4.7H2O and 50 ppmK as K2SO4 in combination with 1 × 10-5 mole liter of one of the following organic acids:Citric acid, Oxalic acid, Formic acid, Acetic acid, Propionic acid, Tartaricacid, Succinic acid, Fumaric acid, Malic acid, Glutamic acid, besides the freeorganic acid nutrient solution as a control. Results revealed that theinteraction between 5.0 ppm Fe and 50 ppm K was the best interaction treatmentfor increasing biomass production and iron uptake of maize and pea seedlingsunder applied condition. Furthermore, exogenous application of organic acidsimproves uptake and translocation of nutrient such as iron, potassium andphosphorus by the maize and pea plants. In conclusion, potassium nutrition andexogenous organic acids have the potential to stimulate Fe-uptake of monocotand dicot plants and mediate iron-biofortified crops.

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