Also called the stem of the leaves, the petiole is actually an extension of the leaf on some plants. It is the structure that connects the leaf to the stem or trunk of most vascular plants. The petiole is not a simple attachment mechanism, but a key player in plant function.
In vascular plants, xylem and phloem tissues are arranged in bundles that form transport systems that direct water and nutrients to plant nutrition. The petiole allows water and dissolved minerals that are absorbed by the roots to move upward into the leaves.
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