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Secondary Growth in Roots Secondary growth occurs in many roots and usually results in the thickening of the root diameter by the addition ofvascular tissue.Initiation of secondary growth occurs when cells in the residual procambium and parts of the pericyle begin to make periclinal divisions.Only the pericyle cells opposite the xylem points start to make periclinal divisions. The inner layer of cells becomes the vascular cambium.nitiation of secondary growth occurs when cells in the residual procambium and parts of the pericyle begin to make periclinal divisions. Only the pericyle cells opposite the xylem points start to make periclinal divisions.
1 Secondary phloem is the secondary growth tissue that conducts food that the plant makes from the leaves to the rest of the plant. 2  The cork cambium is involved in producing the tough, thick covering of a stem and root. 3  Secondary xylem is the wood of a tree trunk. Secondary xylem is the wood of a tree trunk. 2  The annual rings are created by alternating bands of summer wood cells and spring wood cells. 3  The summer wood cells are smaller in diameter, due to less available water, while the spring cells are larger in diameter due to rapid growth from more abundant water.