Lect10S2011 - Secondary Secondary Growth of Stem Primary...

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Secondary Growth of Stem Secondary Growth of Stem Primary Growth of Root Primary Growth of Root
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Summary of Mature Stem of Primary Growth Summary of Mature Stem of Primary Growth
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Mature Dicot X-Section Mature Dicot X-Section Vascular Bundle Pith Pith Ray Phloem Xylem Epidermis Cortex Procambium
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Mature Monocot Section Mature Monocot Section Ground Tissue Vascular Bundles Epidermis
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Monocot vs Dicot Monocot vs Dicot
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Secondary Growth Secondary Growth
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Secondary Growth Secondary Growth All plants have primary growth, i.e. they grow taller. Only growth in annual and ephemeral plants and most monocots . Perennial dicots have secondary growth, the increase in girth of the plant due to lateral meristems .
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Primary Growth Primary Growth Monocots, such as coconut palm has same diameter from top to bottom
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Secondary Growth Secondary Growth Eucalyptus tree, a dicot, is widest at base and can be seen to decrease in diameter as you look up the tree.
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Secondary Growth Secondary Growth Vascular cambium : Derived from procambium and parenchyma cells in pith ray secondary xylem tissue to inside and secondary phloem tissue to outside . Two lateral meristems in secondary growth:
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Secondary Growth Secondary Growth Two lateral meristems in secondary growth: Cork cambium : Derived from parenchyma cells in cortex phelloderm to inside and cork cells to outside. Cork cells also have lenticels for gas exchange.
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Primary Growth in Dicot Stem Primary Growth in Dicot Stem Bottom Bottom I ° Ph I I ° Xy Xy Pr Pr Gt Gt Ep Ep Epidermis (Ep) Primary xylem ( I I ° Xy Xy) and primary phloem ( I I ° Ph Ph) Ground Tissue (Gt) Mature Tissue: Procambium still present! Procambium Procambium still present! still present!
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Summary of Secondary Growth Summary of Secondary Growth Beginning of secondary growth.
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Secondary Growth Secondary Growth Formation of Vascular cambium Vascular cambium from pith ray parenchyma
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Lect10S2011 - Secondary Secondary Growth of Stem Primary...

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