iii.limiting factors in plant growth
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III. LIMITING FACTORS INPLANT GROWTH
Light
Temperature Carbon Dioxide
6CO2 + 12H2O + Light energy
+ Heat (temperature)
C6H12O6 + 6 O2 + 6 H2O
Photosynthesis
PhotosynthesisTemperature, CO2, Light Intensity
Light intensity increase
Car
bo
hy
dra
te p
rod
uce
d
Photosynthesis
Temperature &Carbon dioxide constant
Temperature increase
Car
bo
hy
dra
te p
rod
uce
d
Photosynthesis
Light intensity &Carbon dioxide constant
Carbon dioxide increase
Car
bo
hy
dra
te p
rod
uce
d
Photosynthesis
Temperature & Light intensity constant
Fig 1.
Fig 3.
Fig 2.
CarbohydrateLight, Temperature, CO2
Carbon dioxide increase
Carb
oh
yd
rate
pro
du
ce
d
Photosynthesis
Temperatureconstant
Low light intensity
Medium light intensity
High light intensity
Light intensity increase
Car
bo
hyd
rate
pro
du
ced
Photosynthesis
Temp 70 & 85; CO2 340 ppm
Temp 70; CO2 1300 ppm
Temp 85; CO2 1300 ppm
Fig 4. Fig 5.
Respiration
C6H12O6 + O2
CO2 + H2O + ATP
Respiration & Photosynthesis
Temperature increase
Carb
oh
yd
rate
me
tab
oli
zedRespiration
Fig 6.
Temperature increase
Carb
oh
yd
rate
me
tab
oli
zed
or
pro
du
ce
d
Photosynthesis
Respiration
Compensationpoint
Apparentphotosynthesis
Light intentsity
Ca
rbo
hy
dra
te p
rod
uc
ed
or
me
tab
oli
ze
d
Photosynthesis
Respiration
Constanttemperature
Light saturationpoint
Light compenationpoint
Fig 7.
Fig 8.
Compensation Point
Temperature increase
Car
bo
hy
dra
te m
eta
bo
lize
do
r p
rod
uce
d
Photosynthesis
Respiration
Compensationpoint
Apparentphotosynthesis
Temperature increase
Car
bo
hy
dra
te m
eta
bo
lize
do
r p
rod
uce
d
Photosynthesis
Respiration
Compensationpoints
High light
Low light
Temperature increase
Car
bo
hy
dra
te m
eta
bo
lize
do
r p
rod
uce
d
Photosynthesis
Respiration
Compensationpoints
Top leaf
Middle leaf
Bottom leaf
Temperature increase
Car
bo
hy
dra
te m
eta
bo
lize
do
r p
rod
uce
d
Photosynthesis
Respiration
Compensationpoints
High CO2
Low CO2
Fig 8. Fig 9.
Fig 11.Fig 10.
Light intensity increase
Car
bo
hyd
rate
pro
du
ced
Photosynthesis
Temperature &Carbon dioxide constant
Carbon dioxide increase
Car
bo
hyd
rate
pro
du
ced
Photosynthesis
Temperature & Light intensity constant
Temperature increase
Car
bo
hyd
rate
pro
du
ced
Photosynthesis
Light intensity &Carbon dioxide constant
Carbon dioxide increase
Car
bo
hyd
rate
pro
du
ced
Photosynthesis
Temperature constant
Low light intensity
Medium light intensity
High light intensity
Light intensity increase
Car
bo
hyd
rate
pro
du
ced
Photosynthesis
Temp 70 & 85; CO2 340 ppm
Temp 70; CO2 1300 ppm
Temp 85; CO2 1300 ppm
A B C
Temperature increase
Car
bo
hyd
rate
met
abo
lized
Respiration
Light intentsity
Car
bo
hyd
rate
pro
du
ced
o
r m
etab
oliz
edPhotosynthesis
Respiration
Constanttemperature
Light saturationpoint
Light compenationpoint
Temperature increase
Car
bo
hyd
rate
met
abo
lized
or
pro
du
ced
Photosynthesis
Respiration
Compensationpoint
Apparentphotosynthesis
Temperature increase
Car
bo
hyd
rate
met
abo
lized
or
pro
du
ced
Photosynthesis
Respiration
Compensationpoints
Top leaf
Middle leaf
Bottom leaf
Temperature increase
Car
bo
hyd
rate
met
abo
lized
or
pro
du
ced
Photosynthesis
Respiration
Compensationpoints
High light
Low light
Temperature increase
Car
bo
hyd
rate
met
abo
lized
or
pro
du
ced
Photosynthesis
Respiration
Compensationpoints
High CO2
Low CO2
Temperature increase
Car
bo
hyd
rate
met
abo
lized
or
pro
du
ced
Light intensity increase
Car
bo
hyd
rate
pro
du
ced
Photosynthesis
Temp 70 & 85; CO2 340 ppm
Temp 70; CO2 1300 ppm
Temp 85; CO2 1300 ppm
A
B
C
III. LIMITING FACTORS INPLANT GROWTH
A. Compensation Point
1. Low light vs. high light2. Low CO2 vs. high CO23. Sunny day vs. cloudy day4. Summer vs. winter
B. Light Intensity vs. TemperatureC. Light vs. Carbon DioxideD. Light vs. Temperature vs.
– Carbon Dioxide
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