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Evolution of Vascular Tissue, hydroids found in early plants like mosses,…
Evolution of Vascular Tissue
primitive tissues
hydroid
#
hydrom
water transport
derived
early: parenchyma
mid: hydroid
most derived
tracheids
vessel elements
structure
elongated
lack
lignin
secondary wall thickening
thin-walled
diffs btw bryophytes & tracheophytes
lack secondary wall patterns
lignin-like polmers protect agains microbes
collapse during water stress
resist cavitation
leptoid
#
leptom
assimilate transport
transition
early: parenchyma
mid
albuminous cell
sieve cell
most
companion cell
sieve tube member
structure
elongate shape
slightly olique end walls
nucleus degenerates at maturity
early land plants
mosses
vasculature
hydroids
dead at maturity
sometimes thickened wall
primary wall only
no lignin
leptoids
stereids
structure
elongate
thick-walled
slender
fiber-like
function: support
collective: sterome
slides
gametophyte stem cs
sporophyte stem cs
stuctures to id for each
Vasculature
hydroid
leptoid
Other
cell
stereid
parenchyma
region
cortex
epidermis
lycophytes
aka
spike mosses
quillworts
mainly tropical
earliest land plant with true vasculature
slide
lycophyte stem cs
vasculature
stele
xylem
phloem
other
cells
regions
cortex
epidermis
monilophytes
taxa
psilotum
equisetum
pteridium
tissues
cells
parenchyma
sclerenchyma
regions
vasculature
xylem
phloem
Vascular essential functions
delivery of resources
water
sugars
minerals
amino acids
mechanical support
internal communication
hydroids found in early plants like mosses
leptoids found in early land plants like mosses
