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Formation of interfascicular cambium from fully developed parenchyma cells is an example for
Meristem -> Permanent = Differentiation. Permanent -> Meristem = Dedifferentiation. Secondary Meristem -> Permanent = Redifferentiation!
Cells derived from root apical and shoot apical meristems and cambium differentiate and mature to perform specific functions. This loss of capacity to divide is called differentiation (e.g., parenchyma, tracheary elements).
The living differentiated cells, that have lost the capacity to divide, can regain the capacity of division under certain conditions. This phenomenon is termed dedifferentiation. Formation of interfascicular cambium and phellogen (cork cambium) from fully differentiated medullary ray and cortical parenchymatous cells are classical examples.
When the cells produced by dedifferentiated meristems lose the ability to divide again and mature into permanent tissues (secondary xylem, secondary phloem, cork), it is called redifferentiation.
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Formation of meristematic interfascicular cambium from non-dividing parenchyma is dedifferentiation.
Redifferentiation is the maturation of cells derived from secondary meristems into secondary permanent tissues.
Differentiation is the initial specialization of primary meristematic cells into primary mature tissues.
Development includes all changes an organism goes through from seed germination to senescence.
Confusing dedifferentiation (regaining division) with redifferentiation (loss of division after secondary growth).
"The living differentiated cells, that by now have lost the capacity to divide can regain the capacity of division under certain conditions. This phenomenon is termed as dedifferentiation. For example, formation of meristems - interfascicular cambium and cork cambium from fully differentiated parenchyma cells."
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