Question

Suring 2nd year secondary growth of dicot stem the lateral cork cambium is formed by

Answer 1

The cork cambium is a secondary meristem, containing meristematic cells. The cork cambium forms a major portion of the bark of woody plants. The secondary phloem also is part of the bark, but of course phloem is produced by the vascular cambium. The cork cambium first arises within the cortex as a concentric layer forming a cylinder of dividing cells. The derivatives of this meristematic cell layer differentiate as cork, or phellem, toward the outside of the stem, whereas derivatives produced toward the inner part of the stem differentiate as phelloderm. Suberin is deposited in the cell walls of the phellem and they are dead at maturity. They protect the stem from water loss and from mechanical damage. As the tree increases in girth, the outer layers of bark are sloughed off. Additional cork cambia arise within the secondary phloem as the plant develops.

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