Designed by Pyeongsug Kim ©2008 SI Online Angiosperms Cells and Tissues Topic 21 Spring 2010 Dr. Hughey’s Bio 3 (Lab.)

______________ regions of tissue at the tips of shoots and roots that forms new cells. Apical Meristems Designed by Pyeongsug Kim, ©2009 Three Primary meristems Protoderm, Procambium, and Ground meristem Three Primary tissues Dermal tissue, Ground tissue, and Vascular tissue

Designed by Pyeongsug Kim, ©2010 meristems 3 Primary meristems Protoderm Procambium Ground meristem Give rise to.. Primary Tissues Give rise to.. Dermal Tissue Vascular tissue Ground tissue Dermal tissue Ground tissue Vascular tissue

Tissue System – Designed by Pyeongsug Kim, ©2009 Dermal, Vascular, and Ground

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Designed by Pyeongsug Kim, ©2009 1) Epidermis Cell types - ____________________. Protection & __________ Dermal Tissue Guard cells & Trichomes _________- A hairlike or bristlelike outgrowth, as from the epidermis of a plant. Trichomes aeration Guard cells Stoma

Vascular Tissue #2 Phloem- principal food-conducting tissue in vascular plants; living at maturity; not lignified. Gymnosperm Sieve Elements – Sieve cell- elongate & tapering; with sieve areas. – Albuminous cell- elongate & tapering; delivers substances to sieve cells. Angiosperm Sieve Elements – Sieve-tube element- elongate & tapering; with a sieve plate. – Companion cell- variable; delivers substances to sieve-tube elements. From Dr. Hughey’s Bio3 Slide

Designed by Pyeongsug Kim, ©2009 Vascular Tissue - Xylem & PhloemXylem - (Water-conducting / Food-conducting) tissue - Tracheary Elements ______________ Pholem -(Water-conducting / Food-conducting) tissue - Sieve Elements ______________________ in gymnosperm. ____________________________ in angiosperm Tracheid Vessel element Sieve cell & Albuminous cell Sieve-tube element & Companion cell

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XylemPholem Designed by Pyeongsug Kim, ©2010

Xylem / phloem Tracheid / Vessel element Found in …. -Seedless plant ____ -Gymnosperms ____ -Angiosperms ____ Perforation plate of Vessel element Xylem / phloem Tracheid / Vessel element Found in …. -Seedless plant ____ -Gymnosperms ____ -Angiosperms ____ Tracheid & fibers Pits (little dots) No! Yes! Designed by Pyeongsug Kim, ©2010

Designed by Pyeongsug Kim, ©2009 Xylem

Designed by Pyeongsug Kim, ©2009 Xylem / phloem Gymnosperms / Angiosperms Xylem / phloem Gymnosperms / Angiosperms  Sieve Elements 

A B Xylem / Phloem Gymnosperms / Angiosperms A: B: C: D: E: F:  EF Cross section Longitudinal section C D Sieve-tube elements (mature) Companion cells P-Protein (Phloem-protein) Parenchyma Sieve plate Companion cells P-Protein (Phloem-protein) Designed by Pyeongsug Kim, ©2010

Designed by Pyeongsug Kim, ©2009 Ground Tissue Parenchyma, Collenchyma, & SclerenchymaParenchyma -Parenchyma cells - ______________, storage, and secretion Collenchyma -Collenchyma cells - ______________________ Photosynthesis Support young growing tissues Sclerenchyma - ________________ -Support (strengthen) and storage. Fibers and sclereids

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Designed by Pyeongsug Kim, ©2010 A B CD A: B: C: D: E: Epidermis Cortex Pith (Parenchyma tissue) Vascular bundle Pith rays E Sclerenchyma Sclereid

A B D C E A: B: C: D: E: F: Collenchyma Parenchyma Epidermis Collenchyma Vascular bundle F Designed by Pyeongsug Kim, ©2010

A B C D E A: B: C: D: E: Vascular bundle Parenchyma Phloem Vascular Cambium Xylem Phloem

Dermal Tissues Most epidermal cells lack chloroplasts. Guard cells contain chloroplasts and regulate gas exchange between the inside of the leaf and the surrounding air. Designed by Pyeongsug Kim, ©2010

Tissue System and Its Functions Component Tissues Location of Tissue Systems Dermal Tissue System protection prevention of water loss Epidermis Periderm (in older stems and roots) Ground Tissue System photosynthesis food storage regeneration support protection Parenchyma tissue Collenchyma tissue Sclerenchyma tissue Vascular Tissue System transport of water and minerals transport of food Xylem tissue Phloem tissue From

1. Which tissue is most likely to transport dissolved sugar? Vascular Tissue Xylem TissuePhloem Tissue Function Conduct water and dissolved minerals Support Conduct food and other organic substances Cell Types Unique to This Tissue Tracheids, Vessel members Companion cells Sieve-tube elements Picture from

Ground TissueParenchyma Tissue Collenchyma Tissue Sclerenchyma Tissue * Function Photosynthesis Food storage Healing and tissue regeneration Support in young stems, roots, and petioles Rigid support Protection Cell Types in This Tissue Parenchyma cells Collenchyma cells Sclereid cells & fiber cells *Some texts include tracheids and vessels as components of sclerenchyma tissue. Picture from

Designed by Pyeongsug Kim, ©2010 Please, please, please…… Fill in the blank!