20100906140910 presentation1 photosynthesis
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20100906140910 presentation1 photosynthesis 20100906140910 presentation1 photosynthesis Presentation Transcript

  • What are the process occurs in photosynthesis? How starch is synthesize?
  • THYLAKOID Chloroplast Dark reaction occurs Light reaction occurs STROMA
    • Light Reaction
    • Light energy Chemical energy
    • Chlorophyll & accessory pigments absorb slightly different color of light and pass its energy to central chlorophyll molecule (Chlorophyll a) to do photosynthesis.
    • Two forms of chlorophyll a molecules
    • P700 in PSI (700 nm)
    • P680 in PSII(680 nm)
    • Role of Photosystem
    • :Provide sufficient energy to boost the photoactivated electron to an energy level high enough accepted by NADP
    • : pump proton across thylakoid membranes.
  • Non-cyclic photophosphorylation
  • Cyclic Photophosphorylation
  • Photosynthesis: Pathway of Carbon Fixation STARCH
  • CO2 combines with the phosphorylated 5-carbon sugar ribulose bisphosphate (RUBP) reaction is catalyzed by the enzyme ribulose bisphosphate carboxylase oxygenase ( RUBISCO ) resulting 6-carbon compound breaks down into two molecules of 3-phosphoglyceric acid ( PGA ). PGA molecules are further phosphorylated (by ATP ) and are reduced (by NADPH ) to form phosphoglyceraldehyde ( PGAL ). Enzyme responsible for fixing 200 bilion tons of CO2 anually
  • Phosphoglyceraldehyde (PGAL) serves as the starting material for the synthesis of glucose and fructose . Glucose and fructose PolysaccharideSynthesis starch & cellulose Travel to other part of the plant As Monomer Sucrose
  • CO2 + H20 3-phosphoglycerate ATP + NADPH ADP + Pi NADP+ Triose Phosphate Sucrose, Starch ATP ADP CARBOXYLATION REDUCTION REGENERATION
  • Equation of sugar glucose
    • 6CO2 + 12H2O  C6H12O6 + 6H2O + 6O2
  • CH2O~P Chlorophyll H20 O2 CH2O~P H20 CO2 + H2O ( CH2O)n ATP [ADP + Pi], NADP+ + NADPH Light
  • Reduction Process in Calvin cycle
    • Adds a phosphate from ATP to the 3-PGA
    • removes hydrogen from NADPH and adds it to the 1,3-bisphosphoglycerate
    • In this reduction, a phosphate is removed
    • resulting NADP+, ADP, and Pi can be recycled to the light reactions
    • These steps demonstrate why the light reactions and Calvin cycle are interdependent
  • Why convert Glucose to Starch?
    • products of photosynthesis are assembled in plant to make glucose
    • Glucose (C 6 H 12 O 6 ) is a monosaccharide or single sugar
    • plant uses glucose as short-term energy storage
    • converted into a polysaccharide called starch, allowing the plant to store most of the energy collected in photosynthesis in the chemical bonds between the sugars
    • When the plant needs energy, the bonds holding the glucose molecules together are broken, and energy is released
    • Starch is a better way to store energy because it has more bonds to hold potential energy and it can be stored in large amounts without disturbing the rest of the plant.