View
216
Download
1
Embed Size (px)
Citation preview
Figure 10-1
Lightenergy
Sunlight H2O O2
Light-dependentreactions
ATP, NADPH
Chemicalenergy
CO2
Calvin cycle
(CH2O)n
Chemicalenergy
Figure 10-2
Leaves contain millions of chloroplasts.
Chloroplasts are highly structured, membrane-rich organelles.
Outer membrane
Chloroplasts
Cell
Inner membrane
Thylakoids
Granum
Stroma
Figure 10-21Leaf surfaces contain stomata.
Carbon dioxide diffuses into leaves through stomata.
Guard cells Pore Stoma
StomaCO2Extracellularspace
Photosyntheticcells
O2
H2O
Leaf surface
Interior of leaf
Leaf surface
Figure 10-4
Higherenergy
Wavelengths (nm)
Gamma rays X-rays
Ultra-violet Infrared
Micro-waves
Radiowaves
Shorterwavelength
Visible light
Longerwavelength
Lowerenergy
nm
Figure 10-6a
Different pigments absorb different wavelengths of light.
Chlorophyll b
Chlorophyll a
Carotenoids
Chlorophylls absorb blue and red light and transmit green light
Carotenoids absorb blue and green light and transmit yellow, orange,or red light
Figure 10-11
Reactioncenter
Fluorescence
Heat
Photon
Photon
e–
e–
Electronacceptor
Chlorophyll molecules in antenna complex Reaction centerChlorophyll moleculeLower
Higher
En
erg
y o
f el
ectr
on
RESONANCEFLUORESCENCE REDUCTION/OXIDATIONor or
e–
Electron drops back down tolower energy level; heat andfluorescence are emitted.
Electron is transferred toa new compound.
Energy in electron is transferred to nearby pigment.
Figure 10-1
Lightenergy
Sunlight H2O O2
Light-dependentreactions
ATP, NADPH
Chemicalenergy
CO2
Calvin cycle
(CH2O)n
Chemicalenergy
Figure 10-19
6 NADPH
The Calvin cycle has three phases.
3 ATP+
3 CO2
Regeneration: 5 G3P + 3 RuBP3 ATP
Fixation:
Reduction:
3 RuBP 6 3-phosphoglycerate
6 3-phosphoglycerate + 6 ATP 6 G3P 6 NADPH
6 ADP
The reaction occurs in a cycle.
All three phases of theCalvin cycle take place inthe stroma of chloroplasts
3 CO2
RuBP
3 ADP + 3 Pi
Carbons are symbolized asred balls to help you followthem through the cycle
3 P P
6 P
1 G3P
G3P5 G3P
6 P
6 ATP
3-phosphoglycerate
6 H++
6 Pi
6 NADP+
Fixation of carbon dioxide
Regeneration of RuBP from G3P
Reduction of 3-phospho-glycerate
to G3P
+
+
Figure 10-25
Starch
Glucose subunit
Up to1000or moremonomers
Glucose subunit Fructose subunit
Sucrose
Glucose subunit Glucose subunit
Starch is astorage product
Sucrose is readilytransported
Figure 10-21Leaf surfaces contain stomata.
Carbon dioxide diffuses into leaves through stomata.
Guard cells Pore Stoma
StomaCO2Extracellularspace
Photosyntheticcells
O2
H2O
Leaf surface
Interior of leaf
Leaf surface
Figure 10-20
Reaction with carbon dioxide during photosynthesis :
RuBP + CO2two 3-phosphoglycerate
used in Calvin cycle
Reaction with oxygen during “photorespiration” :
RuBP + O2one 3-phosphoglycerate + one 2-phosphoglycolate
used in Calvin cycle when processed,CO2 is releasedand ATP is used
Giussani et al 2001
Stowe and Teeri 1978
Knapp et al. 1998
Knapp et al. 1998
Knapp et al. 1998
Knapp et al. 1998
Knapp et al. 1998
Knapp et al. 1998
Knapp et al. 1998
Knapp et al. 1998