Lect11S2011 - Secondary Secondary Growth of Root Leaf...

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Secondary Growth of Root Secondary Growth of Root Leaf Anatomy and Plant Nutrition Leaf Anatomy and Plant Nutrition
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Secondary Growth of Root Secondary Growth of Root
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Dicot Root at End Primary Growth Dicot Root at End Primary Growth Epidermis Cortex Endodermis Stele (=Vascular Cylinder)
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Stele of Root at End of Primary Growth Stele of Root at End of Primary Growth Procambium + Pericycle (in part) = Root Vascular Cambium Iº Xylem Iº Phloem Procambium Pericycle Endodermi s
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Stele of Root at End of Primary Growth Stele of Root at End of Primary Growth Inner surface of Inner surface of endodermis cells endodermis cells completely completely covered with suberin . Water & mineral no longer can enter stele from cortex!
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Secondary Growth Summary Secondary Growth Summary Formation of vascular cambium from procambium + pericycle (in part). All Iº tissue outside of pericycle destroyed during IIº growth: Endodermis Cortex Epidermis Cork tissue replaces epidermis Cork cambium of root derived from pericycle
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Secondary Growth of Root Secondary Growth of Root Diagrammatic representation of previous figure (left) The vascular cambium initially star- shaped (right)
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Secondary Growth of Root Secondary Growth of Root Initially greater rate of cell division between xylem arms = circular secondary xylem. Note: pericycle still present! pericycle pericycle Secondary xylem
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Secondary Growth of Root Secondary Growth of Root Tilia root with IIº vascular tissue and cork cells: Cork Cork cambium Cork cambium IIº xylem IIº phloem Vascular cambium Vascular cambium
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Secondary Growth of Root Secondary Growth of Root Tilia root with IIº vascular tissue and cork cells (High Magnification): Cork Cork cambium Cork cambium IIº phloem Vascular cambium Vascular cambium IIº xylem
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Endodermis, cortex and epidermis destroyed during secondary growth Endodermis, cortex and epidermis destroyed during secondary growth Epidermis Cortex Endodermis
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This note was uploaded on 08/09/2011 for the course BIOL 172 taught by Professor Huddleston,m during the Spring '08 term at University of Hawaii, Manoa.

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Lect11S2011 - Secondary Secondary Growth of Root Leaf...

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