Do Irish potatoes store food in the stem?

Irish potatoes (Solanum tuberosum) do not store food in the stem, but rather in specialized structures called stolons or tubers. Tubers are modified, fleshy, and swollen underground stems that develop from stolons. They serve as storage organs for the plant, containing a high concentration of starch, proteins, and other nutrients. The stolons, which are horizontal underground stems, arise from the base of the main plant stem and grow outward, producing tubers at their nodes. These tubers are what we commonly refer to as potatoes and are the primary edible part of the Irish potato plant.