Roots213-page7 - phloem in the primary root stele Once...

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Roots - 7 Lateral (Branch) Root Formation Root pericycle cell dedifferentiates to form a root primordium. Root pushes out through stele, cortex and epidermis by root cap secretions. Eventually the vascular tissue of the lateral root is joined to the vascular tissue of the “parent” root to permit continuous flow of substances. Lateral Root Origin from Pericycle Lateral Roots Emerging Secondary Root Growth A cambium cylinder develops from parenchyma cells between xylem and
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Unformatted text preview: phloem in the primary root stele. Once formed, the cambium produces xylem inward and phloem outward. Additional parenchyma cells form rays • Pericycle cells dedifferentiate to form a cork cambium, which produces a cork layer as well. • The annual growth of "wood" and cork-like bark in secondary roots is very similar to stem secondary growth (to be discussed soon)....
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This note was uploaded on 01/08/2012 for the course BIO 213 taught by Professor Makina during the Fall '09 term at SUNY Stony Brook.

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