A research group has developed an innovative method for the biofortification of leaves and other green plant tissues, increasing their content of healthy substances such as beta-carotene, the main precursor of vitamin A in the human diet. A research group has developed an innovative method for the biofortification of leaves and other green plant tissues, increasing their content of healthy substances such as beta-carotene, the main precursor of vitamin A in the human diet. Biotechnology Agriculture Phys.org – latest science and technology news stories