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Vascular plant anatomy and growth Biol 121, Fall 2010, Tom Buckley 29 Sep 10.
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Transcript of Vascular plant anatomy and growth Biol 121, Fall 2010, Tom Buckley 29 Sep 10.
![Page 1: Vascular plant anatomy and growth Biol 121, Fall 2010, Tom Buckley 29 Sep 10.](https://reader035.fdocuments.in/reader035/viewer/2022062322/56649d145503460f949e9257/html5/thumbnails/1.jpg)
Vascular plant anatomy and growth
Biol 121, Fall 2010, Tom Buckley 29 Sep 10
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Leaves
leaf
leaflet
petiole
Fig 35.6
leaf: has axillary bud
leaflet: no bud
compound leaf:multiple leafletsone axillary bud
Axil
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Leaves
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Typical leaf anatomy
cuticle
epidermis
mesophyll
palisade
spongy
vein
bundle sheath
stomata
guard cells
Fig 35.18
adaxial surface
abaxial surface
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Leaf anatomy
Karaba et al 2007 PNAS 104:15270
fluorescencelignin: bluechlorophyll: red
image by Gregory Johnson, ASU
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leaf scars & bundle traces
Leaf anatomy
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tendrils (climbing)
spines
succulent (water storage)
bracts (look like petals)
Modified leaves
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rhizomes
stolons
bulbs
tubers
Modified stems
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pneumatophores
buttress roots
Modified roots
pneumato- = air
pherein = to carry
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Meristems
apical meristems in...
apical buds
axillary buds
root apices
Fig 35.11
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year'sgrowth
leaf scars
bud scale scars (from apical buds)
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Meristems
Fig 35.11
lateral meristems
vascular cambium
cork cambium
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vascular bundle
xylemphloem
fascicularcambium
fasci- = bundle
Primary growth
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vascular bundlePrimary growth
X xylem P phloem
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vascular bundleinterfascicular cambium
xylemphloem
fascicularcambium
Secondary growth
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vascular bundle
vascularcambium
xylemphloem
fascicularcambium
interfascicular cambiumSecondary growth
Year 1
Year 2
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Fig 35.20
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Fig 35.20
Fig 35.19
XP
Growth ring
{
lateearly woodwood
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primary growth
secondary growth(woody plants only)
primary xylem and phloem
secondary xylem and phloem
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Dicot stem Monocot stem
no secondary growth
Fig 35.17
(Angiosperms)
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Circle danceWhirling dervishes
vascularcambium
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vascularcambium
corkcambium
cork
Secondary growth
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Fig 35.19
{bark periderm
phloemcork
cambiumcork
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Fig 35.23
What is missing?
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Root growth
phloem xylem
endodermis
stele (vascular cylinder)
Fig 35.14 stele = star (e.g., 'stellar')
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Q: Which term applies to the lateral meristemsindicated by the arrows?
(a) xylem
(b) cambium
(c) cork
(d) cortex
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Q: What is the featuresurrounded by the red line?
(a) leaflet
(b) leaf
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Q: Which is typically closer to theadaxial surface -- xylem or phloem?
Q: Which is closer to the vascular cambium during winter:earlywood or latewood?
Q: True or False: A leaf is a flattened structure specialisedfor carrying out photosynthesis.
Q: How many years of growth are shown between the arrows?