Plant Tissues: Plant Tissues: Overview Overview Meristems, Simple Meristems, Simple Tissues, & Complex Tissues, & Complex Tissues Tissues Many of the figures found in this presentation are from Many of the figures found in this presentation are from the internet site the internet site http://botit.botany.wisc.edu/images/130/ and a CD http://botit.botany.wisc.edu/images/130/ and a CD entitled “Plant Anatomy” by Richard Crang & Andrey entitled “Plant Anatomy” by Richard Crang & Andrey Vassilyev published by McGraw Hill. Vassilyev published by McGraw Hill.
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Plant Tissues: Overview Meristems, Simple Tissues, & Complex Tissues Many of the figures found in this presentation are from the internet site
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Many of the figures found in this presentation are from the internet site Many of the figures found in this presentation are from the internet site http://botit.botany.wisc.edu/images/130/ and a CD entitled “Plant Anatomy” by http://botit.botany.wisc.edu/images/130/ and a CD entitled “Plant Anatomy” by
Richard Crang & Andrey Vassilyev published by McGraw Hill. Richard Crang & Andrey Vassilyev published by McGraw Hill.
Meristematic tissues – localized Meristematic tissues – localized regions of cell divisionregions of cell division
Apical MeristemsApical Meristems Primary or Transitional Meristem Primary or Transitional Meristem Primary growth Primary growth
Protoderm Protoderm gives rise to epidermis gives rise to epidermis Ground meristem Ground meristem gives rise to ground tissue gives rise to ground tissue Procambium Procambium gives rise to 1 gives rise to 1
Simple Tissues – consisting of one Simple Tissues – consisting of one cell typecell type
Parenchyma – Parenchyma – thin walled & alive at maturity; thin walled & alive at maturity; often multifaceted.often multifaceted.
Collenchyma – Collenchyma – thick walled & alive at maturitythick walled & alive at maturity Sclerenchyma – Sclerenchyma – thick walled and dead at maturitythick walled and dead at maturity
Sclerids or stone cells – Sclerids or stone cells – cells as long as they are widecells as long as they are wide Fibers – Fibers – cells longer than they are widecells longer than they are wide
Epidermis – alive at maturityEpidermis – alive at maturity Trichomes – “pubescence” or hairs on epidermisTrichomes – “pubescence” or hairs on epidermis Root Hairs – tubular extensions of epidermal cellsRoot Hairs – tubular extensions of epidermal cells
Complex TissueComplex Tissue Xylem – water conducting tissue; Xylem – water conducting tissue; parenchyma, fibers, parenchyma, fibers,
vessels and/or tracheids, and ray cells.vessels and/or tracheids, and ray cells. Phloem food conducting tissue; Phloem food conducting tissue; sieve-tube members sieve-tube members
(no nucleus at maturity, cytoplasm present), (no nucleus at maturity, cytoplasm present), companion cells, fibers, parenchyma, and ray cells. companion cells, fibers, parenchyma, and ray cells. In flowering plants, sieve-tube members and In flowering plants, sieve-tube members and companion cells arise from the same mother cell. companion cells arise from the same mother cell.
Periderm – protective covering;Periderm – protective covering; composed of cork composed of cork and parenchyma.and parenchyma.
Secretory structuresSecretory structures – – responsible for making latex, responsible for making latex, resins, nectar and other substances produced and resins, nectar and other substances produced and stored in channels inside the plant body. stored in channels inside the plant body.
XylemXylem
PhloemPhloem
Vascular Bundles with xylem & phloemVascular Bundles with xylem & phloem
nectar (flowers) from nectaries nectar (flowers) from nectaries oils (peanuts, oranges, citrus) from accumulation of oils (peanuts, oranges, citrus) from accumulation of
glands and elaioplasts. glands and elaioplasts. resins (conifers) from resin canals resins (conifers) from resin canals lacticifers (e.g., latex - milkweed, rubber plants, lacticifers (e.g., latex - milkweed, rubber plants,
opium poppy) opium poppy) hydathodes (openings for secretion of water) hydathodes (openings for secretion of water) digestive glands of carnivorous plants (enzymes) digestive glands of carnivorous plants (enzymes) salt glands that shed salt (especial in plants adapted to salt glands that shed salt (especial in plants adapted to
environments laden with salt). environments laden with salt).