Where It Starts: Photosynthesis. Chapter 5
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1 Where It Starts: Photosynthesis Chapter 5
2 Photosynthesis Metabolic Pathways Converts light energy to chemical energy.
3 Photoautotrophs Organisms that can perform photosynthesis Cyanobacteria (prokaryotic-no chloroplast) Plants Algae
4 Photosynthesis Equation 12H 2 O + 6CO 2 water carbon dioxide LIGHT ENERGY chlorophyll 6O 2 + C 6 H 12 O 6 + 6H 2 O oxygen glucose water
5 upper leaf surface photosynthetic cells Cutaway section of leaf (see next slide)
6 Chloroplast Photosynthetic organelle in plants and algae two outer membranes stroma Thylakoids (inner membrane system)
7 Different Types of Energy Wavelength of light (nanometers)
8 Visible Light Spectrum Composed of different colors Violet (380 nm) to red (750 nm) Longer wavelengths, lower energy
9 Pigments Chemicals that interact with visible light Absorbed colors/wavelength (not seen) Reflect colors/wavelength (color seen)
10 Variety of Plant Pigment Photosynthetic Pigments Chlorophylls Accessory Pigments Carotenoids Anthocyanins Phycobilins
11
12 Photosynthesis. a Two-Step Process 1. Light-dependent reactions 2. Light-independent reaction
13 Light Dependant Reactions Pigments Electron transport chain ATP Production
14 Photosystems Capture light energy Two types (I and II) Composed of. Antenna pigments (accessory pigments) Reaction center (chlorophyll)
15 Electron Transfer Chains Next to photosystems Accepts electrons from reaction center Electrons pass along chain ATP generated.
16 Thylakoid Membrane Section stroma thylakoid membrane thylakoid compartment PHOTOSYSTEM II reaction center PHOTOSYSTEM I reaction center electron transfer chain electron transfer chain
17 Light-Dependent Reactions Two variants 1. Noncyclic pathway 2. Cyclic pathway
18 Noncyclic Electron Flow Two-step pathway Uses both photosystems (I and II) Produces ATP and NADPH Split water Release oxygen
19 energy Non Cyclic Electron Flow e NADP + e light light Photosystem I a H 2 O 1/2 O 2 + 2H + Photosystem II Fig. 5-6a, p.76
20 ATP Synthesis Noncyclic Pathway H + concentrated in thylakoid H + Passive transport through ATP synthase ATP produced Chemiosmosis
21 Light- Harvesting Complex Photosystem II sunlight Photosystem I H + e e e e e e NADPH H 2 O e O 2 H + H + H + H+H+ H + H + H + H + H + H + NADP + + H + thylakoid compartment thylakoid membrane cross-section through a diskshaped fold in the thylakoid membrane ADP + P i H + ATP stroma Fig. 5-7, p.77
22 Non Cyclic Electron Flow: Summary Reactants Location: Thylakoid Membranes Light Photosystem I and II with Chlorophyll Water Electron Transport Chains ADP Products Oxygen ATP NADPH NADP +
23 Cyclic Electron Flow Photosystem I only Electrons Donated by chlorophyll a Passed to electron transfer chain Passed back to photosystem I Electron flow drives ATP formation No NADPH is formed
24 energy e Cyclic Electrton Flow light b Photosystem I Fig. 5-6b, p.76
25 Cyclic Electron Flow: Summary Reactants Location: Thylakoid Membranes Light Photosystem I with Chlorophyll Electron Transport Chain ADP Products ATP
26 Photosynthesis Equation LR LR LR 12H 2 O + 6CO 2 water carbon dioxide LIGHT ENERGY chlorophyll 6O 2 + C 6 H 12 O 6 + 6H 2 O oxygen glucose water
27 Light Independent reaction Synthesis of glucose
28 Light-Independent reaction Fixes carbon dioxide Synthesizes sugar Independent of light Take place in the stroma Calvin-Benson cycle
29 THESE REACTIONS PROCEED IN THE CHLOROPLAST S STROMA 6CO 2 6 RuBP 12 PGA ATP ATP Calvin-Benson cycle NADPH 12 PGAL 1 glucose Fig. 5-8, p.78
30 Light Independent reaction Reactants Carbon dioxide ATP NADPH RuBP Products Glucose ADP NADP + RuBP Reaction pathway is cyclic and RuBP (ribulose bisphosphate) is used and produced
31 Photosynthesis Equation LIR LIR 12H 2 O + 6CO 2 water carbon dioxide LIGHT ENERGY chlorophyll 6O 2 + C 6 H 12 O 6 + 6H 2 O oxygen glucose water
32 sunlight energy H 2 O (water) Photosynthesis (Summary) CO 2 (carbon dioxide) lightdependent reaction ATP ADP + P i NADPH NADP + lightindependent reaction glucose O 2 H 2 O (metabolic water)
33 The C3 Pathway The standard photysynthesis pathway The first stable intermediate is a three-carbon PGA Because the first intermediate has three carbons, the pathway is called the C3 pathway
34 Leaves of basswood, a typical C3 plant. Far right, basswood leaf cross section. Fig. 5-8, p.78
35 upper epidermis palisade mesophyll spongy mesophyll lower epidermis stoma vein air space Fig. 5-8, p.78
36 Photorespiration in C3 Plants On hot, dry days stomata close Inside leaf Oxygen levels rise Carbon dioxide levels drop RuBP bonds to oxygen instead of carbon dioxide Only one PGAL forms instead of two glucose
37 upper leaf surface photosynthetic cells Cutaway section of leaf stoma
38 C4 Plants Carbon dioxide is fixed twice Carbon dioxide is stored as a four carbon compound Carbon dioxide is released from the compound for use in Calvin-Benson cycle Evolutionary defense against photorespiration Corn and Crabgrass are examples
39 Fig. 5-9, p.79
40 upper epidermis mesophyll cell bundlesheath cell lower epidermis vein stoma Corn leaf, cross-section Fig. 5-9a, p.79
41 stomata closed, no CO 2 uptake C4 cycle oxaloacetate mesophyll cell CO 2 RuBP Calvin- Benson cycle PGA bundlesheath cell sugar Fig. 5-9b, p.79
42 CAM Plants Carbon is fixed twice (in same cells) Night Stomates open for gas exchange. Carbon dioxide is fixed by repeated turns of a type of C4 cycle Day Carbon dioxide is released and fixed in Calvin-Benson cycle Cacti and other fleshy plants
43 Fig. 5-10, p.79
44 CO 2 uptake at night only C4 cycle runs at night Calvin- Benson cycle runs during day mesophyll cell sugar Fig. 5-10, p.79
45 Summary of Photosynthesis Light Dependent Reactions sunlight 12H 2 O 6O 2 ADP + P i ATP NADPH NADP + Light Independent Reactions 6CO 2 Calvin- 6 RuBP Benson cycle 12 PGAL 6H 2 O P phosphorylated glucose end products (e.g., sucrose, starch, cellulose)
46 Carbon and Energy Sources Photoautotrophs Carbon source is carbon dioxide Energy source is sunlight Heterotrophs Get carbon and energy by eating autotrophs or one another
47 Linked Processes Photosynthesis Energy-storing pathway Releases oxygen Requires carbon dioxide Aerobic Respiration Energy-releasing pathway Requires oxygen Releases carbon dioxide
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