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Anthocyanin accumulation in plants is associated with greater resistance to herbivory, fungal diseases, bacterial infections, heavy metal toxicity, and other environmental stresses, while carotenoids are a source of provitamin A in the human diet.

Vitamin A comes in two main forms, preformed vitamin A and provitamin A.

It contains so much provitamin A, a substance that transforms into vitamin A in the body, that its flesh has a distinctive orange tint.

Normally, tomatoes and other plants in their Solanaceae family make a precursor called provitamin D3 but then convert it into other compounds using enzymes coded for by two genes, called 7-DR1 and 7-DR2.

The storied ‘golden rice’, which is enhanced with provitamin A and has been in limbo for 20 years, just a few months ago received approval in the Philippines for commercial cultivation.