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How do meristems support plant growth?
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Physiology
Adenosine triphosphate (ATP) is the power source of many biochemical reactions. It is produced in the cell structures and system listed at the left to energize the important life processes listed on the right. An abbreviated chemical formula of the structure of ATP is also shown. The two high-energy P―O―P bonds are responsible for its power.
Meristems are specialized regions of undifferentiated cells that serve as the primary engines for plant growth and development. Unlike most animals, plants possess these regions of active cell division throughout their life span, allowing for continuous growth.123
Meristems support plant growth through several key mechanisms:
- Primary Growth: Apical meristems, located at the tips of roots and shoots, are responsible for the extension of the plant body. Through mitosis, they produce new cells that eventually differentiate into the primary tissues of the plant, including the epidermis, ground tissues, and vascular systems (xylem and phloem).132
- Secondary Growth: Lateral meristems, such as the vascular cambium and cork cambium, facilitate an increase in the girth and thickness of stems and roots after primary elongation has ceased.12
- Localized Development: Intercalary meristems allow for growth in specific regions, such as the internodes of grasses, enabling stems to extend from areas remote from the primary growing points.14
- Regeneration: Meristems can form anew in injured tissues, playing a vital role in wound healing.1
Through these processes, meristems ensure that plants can continuously adapt, expand, and maintain their structural integrity.42