BSC 314 Lecture Notes - Lecture 8: Endodermis, Meristem, Pericycle
26 Jun 2018
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Secondary Growth of Roots
Secondary tissues comprise the greatest volume of the root mass of woody perennial
plants. Primary tissues continue to form in the feeder roots, but the supporting root
structure consists of secondary tissues produced by the lateral meristems,
the vascular cambium, and one or more cork cambia. The usually unobserved
underground root systems of most trees are as massive as the huge aerial bodies and
counterbalance the aboveground weight thus keeping the tree upright and stable.
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Document Summary
Secondary tissues comprise the greatest volume of the root mass of woody perennial plants. Primary tissues continue to form in the feeder roots, but the supporting root structure consists of secondary tissues produced by the lateral meristems, the vascular cambium, and one or more cork cambia. The usually unobserved underground root systems of most trees are as massive as the huge aerial bodies and counterbalance the aboveground weight thus keeping the tree upright and stable. Roots produce branch roots and secondary tissues at the expense of the primary tissues. Cells in the primary tissue are broken and discarded as secondary growth proceeds. New lateral roots form endogenously (from within the root) and push outward from the pericycle, destroying cortex and epidermal tissues on their way to the soil. Initiation of secondary growth takes place in the zone of maturation soon after the cells stop elongating there.
