root tip
Quick Summary
(A) Longitudinal section of a young tree showing how the annual growth rings are produced in successive conical layers. (B) Shoot apex, the extreme tip of which is the apical meristem, or primary meristem, a region of new cell division that contributes to primary growth, or increase in length, and which is the ultimate source of all the cells in the aboveground parts of the tree. (C) Segment of a tree trunk showing the location of the cambium layer, a secondary meristem that contributes to secondary growth, or increase in thickness. (D) Root tip, the apex of which is also an apical meristem and the ultimate source of all the cells of the root system.
The root tip is the terminal part of a plant's root, crucial for growth and development. It includes the protective root cap, which shields the delicate growing point as it pushes through soil. Behind the cap is the apical meristem, a region of actively dividing cells responsible for increasing root length.
These meristematic cells give rise to different tissues. Some contribute to the root cap, while others form the region of elongation, where cells expand. Further up, the region of maturation is where cells differentiate into specialized tissues like the epidermis (for absorption), cortex (for storage and transport), and the vascular cylinder (containing xylem and phloem for water and nutrient transport). In some roots, a "quiescent center" within the meristem has a slower division rate and may play a role in regeneration.12
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