How Many Plants Would it Take to Keep You Alive?
CO2 Diffusion in a Leaf
6NADP+
6NADPH
H+
6H2O 3 O2
12H+
12H+
12H+
ADP
ATP
H+
Photosynthetic Electron TransportThe “Light” Reactions
Stroma
Lumen
12e-
12e-PSII
Cyt b6f
PSI ATPase
GAPDH
6 PGA (3C)
rubisco
3 RuBP (5C)3 CO2 (1C)
6 1,3 BisPGA (3C)
GAP GAP GAP GAP (3C)GAP GAP
DHAP (3C)
F1,6BP (6C)
F6P (6C)
X5P (5C) E4P (4C)
Ru5P (5C)
DHAP (3C)
S1,7BP (7C)
S7P (7C)
X5P (5C) R5P (4C)
Ru5P (5C) Ru5P (5C)
Sucrose, Starch,other Fun Stuff
6 NADPH6 NADP
6 ATP6 ADP
6 ATP6 ADP
Stroma
PGA Kinase
FBPaseSBPase
PRK
Caboxylation
Reduction
Regeneration
Photosynthesis, Our Life Support System!
Light Reactions
Splits H2OO2 ProductionNADPH and ATP
H+
4H+
NADPH
H2O O24H+
4H+
ATP
8H+
atmosphere
The Greenhouse Effect
air
flow
Infrared lightdetector
Infrared lightSource
Put To Good Use !
Measuring Water Vapor
• Relative Humidity (%)
• Partial Pressure (kPa)
• Mole Fraction (ppt)
• Dew Point (°C)
Measuring Irradiance
Photometric Sensor Quantum Sensor
Units: Lux or Footcandles Units: µmol m-2 s-1 or µE m-2s-1
PAR = Photosynthetically Active Radiation 400 – 700 nm
PPFD = Photosynthetic Photon Flux Density, also called Quantum Flux
Conditions to Measure Photosynthesis At
• What Factors Could influence the Photosynthetic rate of the plant?
• What conditions are the most realistic for how our life support plants will be growing and photosynthesizing
LI-COR 6400