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brief introduction to cellular respiration in plants

brief introduction to cellular respiration in plants



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Respiration Respiration Presentation Transcript

  • 6CO 2 + 12H 2 O  C 6 H 12 O 6 + 6O 2 + 6H 2 O C 6 H 12 O 6 + 6H 2 O + 6O 2  6CO 2 + 12H 2 O + Energy Photosynthesis Respiration light ATP
  • Energy Relationship of Photosynthesis and Respiration Carbohydrate Respiration Photosynthesis CO + H O 2 2 2 O 1_2 LOW HIGH Energy 2H + 2H + 2 O 1_2
  • Occurs in dark and light Occurs in sunlight Carbon dioxide produced Carbon dioxide used Water produced Water used Oxygen utilized Oxygen released Occurs in all living cells Occurs in cells with chloroplasts ATP produced through oxidative phosphorylation ATP produced through photophosphorylation Converts food into plant energy Produces food Respiration Photosynthesis
  • Glycolysis Tricarboxylic Acid Pathway Electron Transport Pathway
  • Glycolysis
    • Translates loosely to sugar splitting
    • Start with a molecule of glucose
    • Products = pyruvate, water, and ATP
  • Tricarboxylic Acid cycle
    • Start with pyruvic acid
    • Net outcome is the release of carbon dioxide and electrons
    • Electrons and protons important for the next steps bound in NADH and FADH 2
  • Electron Transport System
    • Electrons from the TCA cycle move through a series of oxidation and reduction reactions
    • Electron transport is coupled to pumping protons across the membrane.
    • Oxygen is the final acceptor of electrons from NADH and FADH 2
    • From one molecule of glucose ultimately you get oxygen reduced to water and the formation of 36 molecules of ATP
  • http://www.life.uiuc.edu/plantbio/cell/
  • http://www.life.uiuc.edu/plantbio/cell/
  • http://www.life.uiuc.edu/plantbio/cell/ Mitochondrion
  • http://www.life.uiuc.edu/plantbio/cell/ Outer Membrane Inner Membrane Matrix
  • http://www.life.uiuc.edu/plantbio/cell/ Folds in the Inner Membrane Intermembrane Space
  • http://www.life.uiuc.edu/plantbio/cell/ Matrix Matrix side of Inner Membrane
  • http://www.life.uiuc.edu/plantbio/cell/ Inner Membrane Matrix
  • http://www.life.uiuc.edu/plantbio/cell/ Intermembrane Space 2e - + 2H + + ½ O 2  H 2 O NADH NAD+ FADH2 FAD H+ H+ H+ H+ H+ H+ H+ H+
  • http://www.life.uiuc.edu/plantbio/cell/ H+ H+
  • http://www.wellesley.edu/Chemistry/chem227/electrontransport/bigpicture.gif Intermembrane Space Matrix H+ H+ H+ H+ H+
  • Respiration
    • Occurs in all living cells
    • Takes place in the mitochondria
    • Chemical opposite of the photosynthetic process
    • Releases ATP
  • Factors Affecting Respiration
    • Temperature
    • Oxygen availability
    • Soil conditions
    • Light
    • Growth rate and metabolic activity of the tissues
  • What’s the big deal with respiration?
    • Used to make chemical energy more accessible for plant growth and development.
      • Growth, repair, reproduction
      • Fight off pathogen attack
  • Fermentation
    • Glucose  pyruvic acid 
    • acetaldehyde + CO2  ethanol
  • Big picture?
    • Why do extension personnel recommend that growers keep night time temperatures in the greenhouse 9 ºF lower than daytime temperatures?
    • If 9 ºF lower is better than I am going to grow my plants at 15 ºF below the daytime temps. I will get better growth. Right?
    • How can you use the principles covered in class today to make an apple last longer?