The tuber begins its growth with the swelling of the seedling hypocotyl. Later, the cavities are formed when cork-generating meristems arise in the inner parenchymatous tissue forming a cork-like wall, cutting off carious shaped and sized enclosures.
As the tuber grows, it starts with the expansion of the seedling hypocotyl. Later, cavities are created when specialized cells called cork-generating meristems form within the inner parenchyma tissue, forming a protective layer that seals off various shapes and sizes of spaces.