2-18 Plants-Secondary Growth (notes)

2-18 Plants-Secondary Growth (notes) - SI Leader: Anita...

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SI Leader: Anita Vijapura Spring 2010 BSC2011 02/18 Plants: secondary growth Secondary growth is growth in thickness produced by lateral meristems and occurs in stems and roots of woody plants, but rarely in leaves. The secondary plant body consists of the tissues produced by the vascular cambium and cork cambium. The vascular cambium adds secondary xylem and secondary phloem. Cork cambium produces a tough, thick covering consisting mainly of cork cells. Primary and secondary growth occur simultaneously but in different regions. While an apical meristem elongates a stem or root, secondary growth commences where primary growth has stopped, occurring in older regions of all gymnosperm species and many eudicots, but rarely in monocots. As cells within the vascular cambium divide, they produce secondary xylem interiorly and secondary phloem exteriorly, thus increasing the thickness. Secondary growth occurs in gymnosperm species and many eudicots, thus the arrangement of vascular bundles is in a ring; unlike in monocots where the arrangement of the vascular bundles is scattered. The vascular cambium develops from undifferentiated cells and parenchyma cells that regain the capacity to
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This note was uploaded on 03/30/2010 for the course BSC BSC2011 taught by Professor Evans during the Spring '10 term at École Normale Supérieure.

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2-18 Plants-Secondary Growth (notes) - SI Leader: Anita...

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