W8L2 - Plant growth

W8L2 - Plant growth - 1 Biol 5B: Organismal Biology Spring...

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Unformatted text preview: 1 Biol 5B: Organismal Biology Spring 09 WEEK 8; Lecture 2 Plant growth Meristems Meristems are perpetually embryonic tissue and allow for indeterminate growth Apical meristems are located at the tips of roots and shoots and at the axillary buds of shoots Apical meristems elongate shoots and roots, a process called primary growth 2 Meristems Lateral meristems add thickness to woody plants, a process called secondary growth There are two lateral meristems: the vascular cambium and the cork cambium The vascular cambium adds layers of vascular tissue called secondary xylem (wood) and secondary phloem The cork cambium replaces the epidermis with periderm, which is thicker and tougher Primary and Secondary growth in plants 3 Primary growth Primary growth lengthens roots and shoots The root tip is covered by a root cap , which protects the apical meristem as the root pushes through soil Growth occurs just behind the root tip, in three zones of cells: Zone of cell division Zone of elongation Zone of maturation Ground Dermal Key to labels Vascular Root hair Epidermis Cortex Vascular cylinder Zone of differentiation Zone of elongation Zone of cell division Apical meristem Root cap 100 m 4 Primary growth of roots The vascular system of a root or a stem is known as the stele ....
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This note was uploaded on 06/07/2009 for the course BIOL 05 taught by Professor Helen during the Spring '09 term at UC Riverside.

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W8L2 - Plant growth - 1 Biol 5B: Organismal Biology Spring...

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