Successfully reported this slideshow.
We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. You can change your ad preferences anytime.

Photorespiration

  • Login to see the comments

Photorespiration

  1. 1. Photorespiratio n
  2. 2. What is PHOTORESPIRATION?• The aberrant use of oxygen by chloroplasts• An interference with carboxylation caused bythe deviant interaction of RuBisCO with oxygen•A process that leads to only one 3PGA beingproduced in the dark reaction in chloroplasts*RuBisCO- ribulose 1,5-biphosphate carboxylase/oxygenase*3PGA- 3-phosphoglyceric acid
  3. 3. Factors that Increases Photorespiration Low CO2 High O2 concentrationHigh temperature concentration
  4. 4. HowPhotorespiration Happens??
  5. 5. CH2OP CH2OP CH2OP CH2OP C=O C-OH HO- C-O-OH HO- C-O-OH O2 C-OH C-OH C=O H2O HO- C-OH C-OH C-OH C-OH C-OH CH2OP CH2OP CH2OP CH2OPRuBPRibulose-1,5-bisphosphate Phospho- CH2OP glycolate COO COO PO4 3PGA C-OH CH2OH CH2OP Peroxisomes Glycolate COO Calvin Cycle
  6. 6. GlyoxylateFromChloroplasts CH2OH O2 CHO COO COO Mitochondria Glycolate NH3+ 2 CH2NH3Glycerate CH2OH CH2NH3 COO CHOH COO COO Glycine CO2 ATP NAD+ NH3+ NADH CH2OH CH2OH CH2OH C=O CHNH3 CHNH3 3PGA COO COO COO Serine Hydroxy Peroxisomes pyruvate
  7. 7. From Serine PhosphoglycolateChloroplast Mitochondria Peroxisome Glycolic acid Glycine
  8. 8. Functions of Photorespiration• Photorespiration Removes Toxic Metabolic Intermediates• Photorespiration Protects from Photoinhibition• Photorespiration Supports Plant Defense Reactions• Photorespiration is Intimately Integrated Into Primary Metabolism
  9. 9. Examples of C3 Type of Plants Wheat Soybean Oat Barley Sunflower Alfalfa
  10. 10. The End of PhotorespirationNext report:C4 CARBON CYCLE

×