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.
The tuber develops from the seedling hypocotyl's swelling, followed by cavities formed as cork-producing meristems emerge in the inner parenchymatous tissue, creating a cork-like wall that seals off irregular spaces.