The chief function of vessels in the plant body is to :

The chief function of vessels in the plant body is to conduct water and mineral salts.
Transportation of food materials manufactured in the leaves to other parts of the plant occurs though phloem.
Storage of food takes place the leucoplasts. Amyloplasts store carbohydrates (starch), e.g., potato; elaioplasts store oils and fats and aleuroplasts store proteins.