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Plant Anatomy(Ch. 35)
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Basic plant anatomy 1• root– root tip– root hairs
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Roots • Roots anchor plant in soil, absorb
minerals & water, & store food– fibrous roots (1)• mat of thin roots that spread out• monocots
– tap roots (2)• 1 large vertical root • also produces many small lateral,
or branch roots • dicots
– root hairs (3)• increase absorptive
surface area2
1
3
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Basic plant anatomy 2• root– root tip– root hairs
• shoot (stem)– nodes• internodes
– buds• terminal or apical
buds• axillary buds• flower buds & flowers
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Modified shootsstolons (strawberries) rhizome (ginger)
tuber (potato) bulb (onion)
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Basic plant anatomy 3• root– root tip– root hairs
• shoot (stem)– nodes• internodes
– buds• terminal or apical buds• axillary buds• flower buds & flowers
• leaves– mesophyll tissue– veins (vascular bundles)
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Leaves• Function of leaves– photosynthesis• energy production• CHO production
– gas exchange– transpiration
simple vs. compound
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succulent leaves
Modified leavestendrils (peas) spines (cacti)
colored leaves (poinsetta)
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• Both systems depend on the other– roots depend on
sugars produced by photosynthetic leaves
– shoots depend on water & minerals absorbed from the soil by roots
Interdependent systems
water &minerals
sugars
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Plant TISSUES• Dermal– epidermis (“skin” of plant)– single layer of tightly packed
cells that covers & protects plant
• Ground– bulk of plant tissue – photosynthetic mesophyll,
storage • Vascular– transport system in
shoots & roots – xylem & phloem
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Plant CELL types in plant tissues• Parenchyma– “typical” plant cells = least specialized– photosynthetic cells, storage cells– tissue of leaves, stem, fruit, storage roots
• Collenchyma– unevenly thickened primary walls– support
• Sclerenchyma – very thick, “woody” secondary walls– support– rigid cells that can’t elongate– dead at functional maturity
If I’d onlyhad triplets!
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Parenchyma
Parenchyma cells are unspecialized, thin, flexible & carry out many metabolic functions all other cell types in plants develop from parenchyma
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Collenchyma Collenchyma cells have thicker primary walls &
provide support help support without restraining growth remain alive in maturity
the strings in celery stalksare collenchyma
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Sclerenchyma• Thick, rigid cell wall– lignin (wood)– cannot elongate– mostly dead at maturity
• Cells for support– xylem vessels– xylem tracheids– fibers• rope fibers
– sclereids• nutshells• seed coats • grittiness in pears
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tracheids
vessel elements Vascular tissue
Aaaah…Structure–Function
again!
vessel element
dead cells
Xylem move water & minerals up from roots dead cells at functional maturity
only cell walls remain need empty pipes to efficiently move H2O transpirational pull
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Phloem: food-conducting cells carry sugars & nutrients throughout plant
sieve tube
companion cell
living cells
plasmodesmata sieve plate
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Phloem: food-conducting cells sieve tube elements & companion cells
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Phloem• Living cells at functional maturity– cell membrane, cytoplasm
• control of diffusion
– lose their nucleus, ribosomes & vacuole• more room for specialized transport of
liquid food (sucrose)
• Cells – sieve tubes• sieve plates — end walls — have pores to facilitate
flow of fluid between cells– companion cells• nucleated cells connected to the sieve-tube • help sieve tubes
Aaaah…Structure–Function
again!
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Vascular tissue in stems
dicottrees & shrubs
monocotgrasses & lilies
collect annual rings
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Vascular tissue in roots: dicot
xylemphloem
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xylem
phloem
Vascular tissue in roots: monocot
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2006-2007
You too can be a Flaming Carrot if… You Ask Questions!
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Review Questions
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1. One important difference between the anatomy of roots and the anatomy of leaves is that
A. only leaves have phloem and only roots have xylem. B. the cells of roots have cell walls that are lacking in
leaf cells.C. a waxy cuticle covers leaves but is absent in roots.D. vascular tissue is found in roots but is absent from
leaves. E. leaves have epidermal tissue but roots do not.
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2. Three basic tissue types in plants areA. Xylem, phloem and tracheidB. Dermal, vascular and groundC. Parenchyma, schlerenchyma and colenchymaD. Fibrous, xylem and phloemE. Dermal, fibrous and vascular
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3. Phloem transportsA. Carbohydrates,B. IonsC. WaterD. MineralsE. protein
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True or False:
4. Nothing is absorbed by the stem of a plant 5. Nothing is absorbed by the leaves of a plant6. The roots receive oxygen from the phloem7. Most of a xylem is dead at functional maturity8. Spines are modified leaves9. Potatoes are modified stems10. A cucumber is a fruit