Abstract
The low micronutrient content of cereals requires the fortification of food and biofortification of plants. Many laboratories are currently pursuing biofortification using breeding and genetic modification, but progress is challenged by technical hurdles and our understanding of physiological processes. Recent studies have largely been confined to the improvement of levels of iron, zinc, some vitamins and a variety of essential amino acids. Progress has been made in the accumulation of iron, zinc, and vitamins A and E in genetically modified plants. For future success in this area, many more studies will be required on the physiology of ion uptake and on the transport of vitamin precursors.
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