Lab #8 Angiosperms.

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Presentation transcript:

Lab #8 Angiosperms

Plastids Amyloplasts – from garden bean chromoplasts – from red pepper

Epidermal structures Trichome and leaf cross section Guards cells + Stoma

Mesophyll – Palisade and Spongy epidermis

Monocot Root xylem (vessel element & tracheids) pith phloem pericycle http://www2.mcdaniel.edu/Biology/botf99/rootuse/monovsdi.htm

Monocot root endodermis xylem (vessel element & tracheids) pith phloem pericycle endodermis pith

Monocot stems epidermis parenchyma

Monocot Stem Vascular Bundle xylem sclerenchyma is called a bundle sheath in monocot leaf vascular bundles

Monocot Leaf

Dicot Root vascular cylinder = stele pericycle phloem metaxylem endodermis metaxylem from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

Dicot Lateral Root

Dicot stems Trifolium (clover) epidermis cortex pith Helianthus (sunflower) phloem vascular cambium metaxylem protoxylem from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

Dicot Stem sclerenchyma fasicular xylem interfasicular cambium pith phloem Dicot Stem

Dicot Stem Vascular Bundle sclerenchyma tracheids region of protoxylem metaxylem

Dicot Leaf Stained cross-section through the leaf of lilac: 1 upper epidermis, 2 palisade parenchyma, 3 spongy parenchyma, 4 air cavity, 5 lower epidermis, 6 stomata, 7 trichome, 8 major vein, 9 xylem, 10 phloem, 11 supporting tissue (sclerenchyma) http://www.vcbio.science.ru.nl/en/virtuallessons/leaf/mesomorph/

Dicot Leaf

Dicot vs. Monocot Vascular Bundles Sclerenchyma tracheid Sclerenchyma DICOT MONOCOT from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

Dicot vs. Monocot Root

Monocot vs. Dicot Stem DICOT MONOCOT

No vascular cambium – no secondary growth! sclerenchyma phloem metaphloem protoxylem metaxylem

WATER-CONDUCTING CELLS OF THE XYLEM Tracheids with circular-bordered pits in their primary walls TRACHEIDS Tracheids Pits WATER-CONDUCTING CELLS OF THE XYLEM from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

VESSEL ELEMENTS perforation plates in the side walls of a vessel element vessel elements with perforation plates tracheids

Ash wood perforation plate xylem ray vessel element tracheids perforation plate: the end wall of a vessel element where the secondary cell wall was not deposited and the primary cell wall has been digested. vessel element tracheids from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

vessel elements tracheids from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

perforation plates pits from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

Tracheids with annular thickenings from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

3 yr Tilia stem (Basswood) secondary xylem (tracheids & vessel elements) vascular cambium phloem cork cork + cork cambium = periderm vascular cambium to cork = Bark

Cork Cambium lenticel cork cork cambium from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

Lenticel from Biology 311 site Alison Roberts (aroberts@uri.edu) © 1998-2012 AWR

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