What is the function of protoxylem?

Protoxylem is the first-formed xylem tissue in vascular plants, primarily responsible for the transport of water and minerals from the roots to the rest of the plant. It provides structural support during early growth and development, allowing the plant to maintain rigidity as it expands. Protoxylem vessels are typically more flexible and smaller in diameter than later-formed metaxylem vessels, accommodating the plant's growth while still effectively facilitating water movement.