photosynthesis project 10
TRANSCRIPT
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Photosynthesis
Light energy from the sun is
converted to chemical energy that isstored in sugar
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The sun powers all life on earth
directly or indirectlyAutotrophs (producers) obtain energy directly from
the sun, while heterotrophs (consumers) obtain
energy by eating autotrophs or other heterotrophsthat ate autotrophs.
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Our plan
1st: general information about photosynthesis
2nd: two stages of photosynthesis
- light reactions- Calvin cycle
3rd: evolutionary adaptations of plants
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Chloroplasts
Every square millimeter of leaf tissue contains
about half a million chloroplasts.
Chloroplasts are found mainly in cells of themesophyll, the interior of the leaf.
Carbon dioxide enters (and oxygen leaves) the leaf
through stomata on the underside of the leaf.
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2005-2006
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2005-2006
A Closer Look at Stomata
http://www.tutorvista.com/content/biology/biology-iv/plant-water-relations/opening-
closing-stoma.phphttp://academic.kellogg.edu/herbrandsonc/bio111/animations/0021.swf
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Chloroplasts
A double membrane encloses fluid called stroma.
Membranous sacs called thylakoids contain chlorophyll
and separate the thylakoid space from the rest of thechloroplast.
Thylakoids may be stacked in columns called grana.
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Photosynthesis as a Redox Reaction
6 CO2 + 6 H2O C6H12O6 + 6 O2
- Water is split and electrons (along with H ions)are transferred to carbon dioxide, reducing it
to glucose.
- Energy (from sunlight) is required to energize
the electrons as they move from water to
sugar.
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Photosynthesis and Free Energy
Anabolic = complex products are made by assemblingsimpler reactants
Enderg
onic =energy is required
± ( G is positive
± Reaction is uphill
± Reactants contain less energy than the product
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Light (electromagnetic energy)
The amount of energy in light is inversely proportional to
the wavelength of light.
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Why are plants green?
When sunlight (whitelight) hits an object,some wavelengths are
absorbed and othersare reflected.
± Pigments absorb lightand those wavelengths
disappear. ± We see the color of
the light that isreflected.
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Chlorophylls Absorption Spectrum
* Chlorophyll is a
pigment that
absorbs red, blue,and violet light,
but reflects green
light.
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Overview of Photosynthesis
1) Light reactions
- Convert solar energy to chemical energy
- Light absorbed by chlorophyll energizes
electrons which are transferred to NADP+ toform NADPH
- Splits water; oxygen is produced
- Some ATP is made by photophosphorylation
Light energy NADPH and ATP
No sugar has been made yet
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Overview of Photosynthesis
2) Calvin Cycle (dark reactions; light
independent reactions; carbon fixation)
- Uses NAD
PH and the energy inAT
P to reducecarbon dioxide to glucose
Carbon dioxide, NADPH and ATP Glucose
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Overview of Photosynthesis
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Preview of Light Reactions
Purpose: Convert solar energy into chemicalenergy (ATP and NADPH) that will later be used
to convert carbon dioxide into glucose
1st: sunlight excites chlorophylls electrons
2nd: the excited electrons give off energy as they
pass through electron transport chains3rd: the energy released from the electrons is used
to make ATP and the electrons are picked up byNADP+ to make NADPH
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Pigment Molecules are organized into Photosystems
that are embedded in the thylakoid membranes
- Reaction centersurrounded by light-harvesting complexes
- Reaction center contains 2special chlorophyll amolecules and a primaryelectron acceptor
- Each light-harvesting complex contains otherpigment molecules thatfunnel energy to thereaction center (antenna)Two Photosystems work in order: Photosystem
II works first, and then Photosystem I
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Light Reactions begin in
Photosystem II
1) Sunlight excites the electrons of the pigments inthe light-harvesting complexes
2) The energy is funneled to the chlorophyll amolecules in the reaction center
3) Chlorophyll as electrons are excited andtransferred to the primary electron acceptor
REDOX REACTION: chlorophyll a is oxidized and the
primary electron acceptor is reduced
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High energy electrons pass through an electron
transport chain from Photosystem II to Photosystem I
4) As the electrons from Photosystem II travel through theelectron transport chain, they release a little bit of energythat is used to make ATP by photophosphorylation (verysimilar to oxidative phosphorylation in respiration)
5) Electrons in the reaction center of Photosystem I are alsoexcited by sunlight and transferred to the primary electronacceptor
6) Energized electrons from Photosystem I travel down asecond electron transport chain and are picked up byNADP+ to form NADPH
7) The electrons from Photosystem II arrive at the reactioncenter of Photosystem I to replace the lost electrons
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Uh-Oh! Photosystem II has lost
electrons!
The light reactions usually progress by noncyclicelectron flow. ± Electrons from Photosystem II replace the electrons
lost by Photosystem I to NADPH
± Buthow are Photosystem IIs electrons replaced?
Enzymes in Photosystem II split water into 2electrons, 2 hydrogen atoms, and an oxygen atom ± The electrons replace those lost in the reaction center
± The oxygen atom combines with another and isreleased
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Sometimes, cyclic electron
flow occurs
Only Photosystem I is used ± Electrons leave
Photosystem I, enter theprevious electron
transport chain, andreturn to Photosystem I
± ATP is made, but NADPH isnot
This happens because theCalvin cycle needs moreATP than NADPH to makeglucose
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Electron Transport Chain in
Photosynthesis
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Electron Transport Chain in
Photosynthesis
Photophosphorylation is almost exactly the same asoxidative phosphorylation in cellular respiration
± A proton-motive force is generated across a membrane
± H+ ions can only cross the membrane through ATP
synthase ± Chemiosmosis: energy of H+ ions flowing down their
concentration gradient powers the addition of aphosphate group to ADP
One spatial difference ± In cellular respiration, H+ ions were pumped out of the
matrix and into the intermembrane space
± In photosynthesis, H+ ions are pumped into the thylakoidspace from the stroma
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Dont lose focus!
The purpose of the light reactions is to use
solar energy to generate ATP and NADPH,
which will later provide the energy needed to
reduce carbon dioxide to glucose
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Summarize the Light Reactions
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Summarize the Light Reactions
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Preview of Calvin Cycle
Purpose: to use the energy and reducing power stored in ATP
and NADPH to form glucose from carbon dioxide
CO2 has very little chemical energy
± fully oxidized
C6H12O6 contains a lot of chemical energy
± reduced
Reduction of CO2
p C6
H1
2
O6
proceeds in many small steps
± each catalyzed by specific enzyme
± using energy stored in ATP and NADPH
Needs products of light reactions to drive synthesis of glucose
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Calvin Cycle
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Carbon Fixation
1) RuBP is a 5-carbon sugar present at thebeginning of the Calvin cycle
2) Rubisco adds one molecule of CO2 to RuBP to
form a 6-carbon sugar
3 molecules of CO2 enter, one at a time, and each is
added to a different molecule of RuBP
3) This 6-carbon sugar is very unstable and splits inhalf immediately to form 2 molecules of
phosphoglycerate (each contains 3 carbons)
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Reduction
4) All 6 molecules of 3-phosphoglycerate arephosphorylated by ATP and reduced by NADPH toform 6 molecules of glyceraldehyde-3-phosphate
(G3P)
F or every 3 molecules of CO2 that enter, 6 molecules
of G3P are made.
5) 1 molecule of G3P leaves to become glucose andthe other 5 molecules of G3P remain in the Calvincycle
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Regeneration of RuBP
6) The 5 molecules of G3P are re-organized into
3 molecules of RuBP
- requiresAT
P
7) 3 molecules of RuBP are ready to accept 3
more molecules of CO2
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Rubisco
Enzyme which fixes carbon from atmosphere
± ribulose bisphosphate carboxylase
± the most important enzyme
± the most abundant enzyme
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Accounting in the Calvin Cycle is
complicated
3 turns of Calvin cycle yield 1 G3P
± 3 CO2p1 G3P (3C)
6 turns of Calvin cycle yield 1 C6H12O6 (6C)
± 6 CO2p1 C6H12O6 (6C)
±
18 ATP + 12 NADPHp 1 C6H12O6
* See the need for cyclic electron flow in the light
reactions?
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Dont lose focus!
The purpose of the Calvin cycleis to use the
energy made inthe lightreactions tocombine
molecules of carbon dioxideinto glucose
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Summarize the Calvin Cycle
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Summarize the Calvin Cycle
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Summarize all of Photosynthesis
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Summarize all of Photosynthesis
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Photorespiration
Problem plants face: ± Carbon dioxide needed for photosynthesis enters through leaf
pores called stomata
± Water is lost when stomata are open (transpiration)
How plants react: ± Close stomata on hot, dry days to conserve water
± Now produce less glucose (less CO2 enters leaf)
± Rubisco adds O2 to Calvin cycle and a 2-carbon molecule is
produced (rubisco has an affinity for oxygen!!!!
) ± Uses ATP, doesnt make glucose
Is this evolutionary baggage or is it productive?
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Adaptation of C4 plants
(a better way to capture CO2
)
Two distinct types of photosynthetic leaf cells
± 1st: PEP carboxylase in the mesophyll cells adds carbon dioxideto a 3-carbon molecule forming a 4-carbon molecule
PE
P carboxylase has a much higher affinity for CO2 and a much loweraffinity for O2 than rubisco
PEP carboxylase can fix carbon more efficiently when the stomata areclosed and CO2 levels in the leaf are low
± 2nd: the 4-carbon molecule travels through plasmodesmata tobundle-sheath cells, breaks down, and release CO
2for use in the
Calvin cycle
Keeps CO2 levels high enough in bundle-sheath cells to avoidphotorespiration
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C4 pathway
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C4 pathway
Physically separates carbon fixation from Calvin cycle
Outer cells (mesophyll)
-near stomata- fix carbon
- pump CO2 to inner cells
- keep O2 away from inner cells (Rubisco)
Inner cells (Bundle-sheath)
- Make glucose from CO2 being pumped in
- Glucose enters veins easily
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Adaptation of CAM plants
Stomata open at night and closed during day ± Closing stomata during the day helps them conserve water,
but also cuts off their CO2 supply
Take in CO2 at night and fix it into organic acids that arestored in the mesophyll cells
During the day when the light reactions produce ATP
and NAD
PH, these acids break down to release CO2
Also separates carbon fixation from the Calvin cycle, butbased on time, not location (like C4 plants)
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C4 and CAM plants
Carbon dioxide enters plant
leaves through the
stomata, while oxygen (the
photosynthetic
waste product) and water
from the leaves exit
through the stomata.
Plants must constantly
balance both water loss and
energy gain(photosynthesis).
This has led to the evolution
of various modifications of
C3 photosynthesis.
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Summarizer: Plant Adaptations
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Summarizer: Plant Adaptations
C3 C4 CAM
How and when does
carbon dioxide get
into each leaf?
How do these plants
avoid
photorespiration? (In
other
words, how do they
concentrate CO2 for
the Calvin
cycle?)
Where does the
Calvin cycle
occur?