The outermost layer of the vascular cylinder in roots, located just inside the endodermis, that gives rise to lateral roots and contributes to secondary growth. The pericycle retains the ability to divide throughout the plant's life.
From Greek 'peri' (around) and 'kyklos' (circle), literally meaning 'around the circle,' referring to its position surrounding the vascular tissue. The term was established in botanical literature in the late 19th century.
The pericycle is like a plant's construction crew headquarters - it's where all lateral roots begin their development! Unlike most plant tissues that lose their ability to divide, pericycle cells stay forever young and can spring into action to create new roots wherever they're needed.
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