Photosynthes
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Transcript of Photosynthes
ANABOLIC REACTIONANABOLIC REACTION ENDERGONIC REACTIONENDERGONIC REACTION CORBOHYDRATES ARE PRODUCEDCORBOHYDRATES ARE PRODUCED O2 IS BIPRODYCTO2 IS BIPRODYCT
6CO2+12H2O6CO2+12H2O C6H12O6+6H2OC6H12O6+6H2O
OVERVEIW OF PHOTOSYNTHESISOVERVEIW OF PHOTOSYNTHESISOVERVEIW OF PHOTOSYNTHESISOVERVEIW OF PHOTOSYNTHESIS O2 AND CARBOHYDRATES ARE PRODUCEDO2 AND CARBOHYDRATES ARE PRODUCED
BRIEF PHOTOSYNTHESISBRIEF PHOTOSYNTHESIS
thylacoid
CHLOROPLAST
Periplastidial space
Inner membrane
Outer membrane
Lumen
STRUCTURE OF CHLOROPLAST
Chloroplast contains the pigments
Matrix is called STROMA Thylacoids embedded in stroma Group of thylacoids called
GRANA Dark Reaction : STROMA Light Reaction : GRANA Thylacoid membranes contain
1.PHOTOSYSTEM I2.PHOTOSYSTEM II
PHOTOSYSTEMSPHOTOSYSTEMS PHOTOSYSTEMSPHOTOSYSTEMS
CONTAINS 2 COMPONENTS:
1.ANTENA(LHC): It absorb radiant
energy & supplies it to reaction center.
2.REACTION CENTER: Converts the light
energy into chemical energy.
Reaction center in PS-I is P700.& in PS-II P680
MECHANISM OF PHOTOSYNTHESISMECHANISM OF PHOTOSYNTHESISMECHANISM OF PHOTOSYNTHESISMECHANISM OF PHOTOSYNTHESIS
1.LIGHT REACTION: NADPH & ATP are generated
from light. NADPH & ATP are called
ASSIMILATORY POWER
2.DARK REACTION: Formation of Carbohydrates
fromCO2 by utilizing
ASSIMILATORY POWER Both reactions were first
discovered by BLACKMAN in 1905.
LIGHT REACTIONSLIGHT REACTIONS
DISCUSSED UNDER 4 HEADINGS:1. HILL REACTION
2. EMERSON ENHANCEMENT EFFECT
3. PSI &PSII ELECTRONE TRANSPORT & PROTON TRANSLOCATION
4. PHOTOPHOSPORYLATION
1. HILL REACTION:
Photolysis of water
2H2O+2A------------2AH2+O2
States that O2 is released from water not from CO2
EMERSON ENHANCEMENT EFFECT
RED DROP: Drop in photosynthetic rate at higher
wave length of red light Increase in the Photosynthetic rate at
higher and lower wave length of light (650-680nm) when used simultaniously called as EEE
PSI & PSII
PSI &PSII ELECTRON TRANSPORT AND PROTON TRANSLOCATION
ELECTRONS MOVES ACROSS THE COMPLEXES IN THE CHLOROPLAST MEMEBRANE TO PRODUCE ASSIMILATORY POWER
PHOTOPHOSPHORYLATION DANIEL ARNON:First described Occurs according to the MITCHELL’S Chemiosmotic theory TWO TYPES: 1.CYCLIC ELECTRON TRANSPORT
2. NONCYCLIC ELECTRON TRANSPORT
CYCLIC ELECTRON TRANSPORT Electrons move in cyclic manner to generate ATP
NONCYCLIC ELECTRON TRANSPORT ELECTRONS MOVE IN A CLOSED CIRCUTE
DARK REACTION Occurs in stoma CO2 is reduced to form carbohydrates
by utilizing ASSIMILATORY POWER.
TWO PATHWAYS are identified. 1.CALVIN CYCLE(C3) 2.HATCH & SLACK PATHWAY(C4)
DARK REACTION
CALVIN CYCLE(C3) CO2 REDUCED TO FORM CARBOHYDRATES CO2 ACCEPTER IS RUBP FIRST PROCUCT IS 3-PHOSPHOGLYCERIC ACID 3PGA CONTAINS 3 CARBONS SO THE NAME C3.
STEPS:1. CARBOXYLATION PHASE
2. REDUCTION PHASE3. REGENERATION PHASE
CALVIN CYCLE(C3)
CALVIN CYCLECALVIN CYCLE CALVIN CYCLECALVIN CYCLE
HATCH&SLACK PATHWAY(C4)
B.CARBOXYLATION OCCURS IN 1500 SPECIES OF 19 FAMILIES THESE CAN GROW IN DROUGHT CONDITIONS LEAVES CONTAINS KRANZ ANATOMY FIRST PRODUCT CONTAINS 4 CARBONS SO
THE NAME IS C4 CYCLE
Am HriticI tell u About
C3 cycle
Let’s move to next page
KRANZ ANATOMY
HATCH & SLACK PATH WAY
C4 CYCLE1.PYRUVIC
ENZYMES
PEP DECARBOXYLAASE
MALIC ACID DEHYDROGENASE
MALIC ENZYME
PIRUVIC ACID DIKINASE
FACTORS EFFECTING PHOTOSYNTHESIS
1.EXTERNAL FACTORS2.INTERNAL FACTORS
EXTERNAL FACTORS: LIGHT TEMPERATURE CO2 CONCENTRATION O2 CONCENTRATION H2O
INTERNAL FACTORS CHLOROPHYLL CONTENT INTERNAL STRUCTURE OF LEAVES ACCUMULATION OF END PRODUCT BLACKMAN’ LAW OF LIMITING FACTOR