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Prof Jeremy Pritchard
@DrJPritchard
Plants & Pressure
Prof Jeremy Pritchard
@DrJPritchard
Plants & Pressure
1. Hydraulic machines
2. Measuring turgor
3. Phloem and phloem defence
4. Xylem and climate change
What plant do you use for your
water relations?
A. Potato
B. Carrot
C. Apple
Plants are hydraulic machines
Prof Jeremy Pritchard
@DrJPritchard
Plants & Pressure
1. Hydraulic machines
2. Measuring turgor
3. Phloem
4. Xylem
Turgor pressure generation
• Salts and sugars are accumulated
in the cell
• Water follows by osmosis
• Turgor pushes against cell wallwater
P
Solutes
The units of pressure ………..
Atmosphere
Bars (millibars)
lb in2 (PSI)
mm Hg
mm H20
Pascal, (KPa, MPa)
Torr
Measuring pressure
T
C
The pressure probe can measure turgor in single cells
Capillary
Pressure
transducer
Plunge
rSilicone oil
Cel
l
tur
gor
Cel
l
tur
gor
(
Cel
l
tur
gor
(
(
Cel
l
tur
gor
(
Cel
l
tur
gor
(
Cel
l
tur
gor
20 mm Hg = 0.026 bars
120 mm Hg = 0.16 bars
Phloem >30 bars >200 m
Root 6 bars 60 m
Tyre 2 bars 20 m
Bottle 1.5 bars 15 m
Lungs 0.15 bars 1.5
Prof Jeremy Pritchard
@DrJPritchard
Plants & Pressure
1. Hydraulic machines
2. Measuring turgor
3. Phloem and phloem defence
4. Xylem and climate change
The Human circulation system
Veins Arteries
0.08 0.16 bars
The plant circulation system
Xylem phloem
minus 40 plus 40 bars
The plant circulation system
Translocation in the high pressure phloem
Phloem
The plant circulation system
Why does your lawn not bleed to death?
0 min1 min3 min30 min40 min60 min
Plant scabs: Slow tube blockage
Nano - technology
Prof Jeremy Pritchard
@DrJPritchard
Plants & Pressure
1. Hydraulic machines
2. Measuring turgor
3. Phloem and phloem defence
4. Xylem and climate change
Xylem
The plant circulation system
A xylem journey
CO2
H2O
CO2
Carbon
Rhizosphere?
Growth?
Stomata?
Defence?
Reproduction?
Ecology?
Water columns can snap
Root pressure can flush out cavitation
Dr Jeremy Pritchard
@DrJPritchard

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