AGRY 525 Quiz II

Card Set Information

Author:
MRK
ID:
259390
Filename:
AGRY 525 Quiz II
Updated:
2014-02-14 23:25:26
Tags:
Photosynthesis respiration
Folders:

Description:
Class notes
Show Answers:

Home > Flashcards > Print Preview

The flashcards below were created by user MRK on FreezingBlue Flashcards. What would you like to do?


  1. RuBP Carboxylase (RUBISCO)
    5
    • Makes up 50% of protein in soybeans
    • Moderate affinity for CO2
    • Some (low) affinity for O2
    • Photo-respiration- 30% loss efficiency
    • Odd b/c most enzymes are extremely specific
  2. PEP Carboxylase
    3
    • High affinity for CO2
    • No affinity for O2
    • Works better with increased light
  3. CAM Plants
    • Crassulean Acid Metabolism
    • Cacti, Succulents- (broad groups)
    • Separates temporally
    • Saves H2O, dry niches, grows slow
  4. CAM Photosynthesis
    • @ Night: CO2 + PEP -> Oxalacetate => vacuoles
    • @ Day: Stomata close, Oxaloacetate -> pyruvate and CO2 -> C3
  5. Photo-respiration
    6
    • RUBISCO + O2 -> 1 PGA + P-glycolate
    • 5C + 0C -> 3C + 2C
    • P-glycolate -> PGA + CO2 => sugar
    • Lose 30% efficiency
    • No clear purpose for glycolate
    • Can't detect PR in C4 plants
  6. Dark Respiration
    Glycolysis
    • In all live tissue
    • CHO + O2 -> CO2 + H2O + ATP
  7. C4 Anatomy
    6
    • Krantz Anatomy
    • 3-5 Mesophyll cells btw viens
    • Bundle sheaths have chloroplast
    • C3 conducted in high [CO2] bundle sheath
    • mesophyll cell: CO2 -> C4 organic acid
    • High Photosynthesis rates
  8. C3 Anatomy
    • 20-40 mesophyll cells btw viens
    • No Chloroplasts in bundle sheath
    • Sucrose made in Mesophyll then moved by phloem
  9. Photorespiration Anatomy
    • Chloroplast, peroxisome, and mitochondria are very close
    • need to be close
  10. Attempt to slow Photorespiration
    • Unsuccessful
    • mutant doesn't preform enough photosynthesis and dies
  11. 3 things plant can do with sugar made
    • grow
    • store
    • transport
  12. Respirtaion uses ____% of CHO fixed daily from photosynthesis
    45
  13. Dark Respiration / Glycolysis Anatomy
    6
    • ATP Synthase is membrane bound
    • affected by extreme cold
    • Proton gradient
    • 8 pH inside [high], 5 pH outside [low]
    • 1,000 fold different
    • Other protiens involved contain metals
  14. RUBISCO is found in C4 plants where....
    Bundle sheath
  15. C4 PEP Carboxylase found...
    Mesophyll cell
  16. C4 Hydroxpyruvate reductase is found...
    Bundle sheath cells
  17. C4 glycolate oxidase is found...
    bundle sheath cells
  18. C3 v C4
    mesophyll conductance
    CO2 compensation point (taken in and given out)
    • low , high
    • high, low
  19. takes more energy to make a corn / soybean
    soybean- lipids and oils harder
  20. Categories of Dark Respiration
    • Growth
    • Maintenance
  21. Growth (From dark respiration)
    • Increased dry matter accumulation
    • Nutrient Uptake
    • Relates to CHO availablity
    • Varies with Composition of what you are making
  22. Maintenance
    • upkeep of the plant/cell
    • Protein turnover (isozymes- same function different make up)
    • Proportional to plant size
    • 2-4% of plant mass used/day
  23. Dark respiration v. night time temps
    • Cooler = low dark respiration = high yield
    • Warmer = higher respiration = lower yield
  24. Ps - R = growth + stored reserves
    • net Ps
    • CHO goes from left to right
  25. younger plants do
    ___ biomass
    ___ matainentce
    ___ growth than older plants
    more, less, more
  26. leaf [N] ie protein v. maintenance
    more protein = more turn over (they breakdown) = high maintenance
  27. Respiration rate v. dry matter
    less respiration = more dry matter
  28. As plants mature what happens to the ratio of photosynthesis to respiration
    starts ~45% respiration then increase to ~90
    • 0 = negative Ps = rate of respiration
    • Ic = light compensaiont point (Ps = respiration)
    • alpha = RUE (better at low light)
    • top = no increase in Ps, saturation
  29. which (C4 or C3) reach saturation first?
    C3
  30. Pendeton light experiments
    • Put Al foil frames on ground to increase light
    • did significantly yield, height, diameter
    • Extra light- more increase
  31. C4 plants are light limited?
    Yes, when given more light they do better
  32. Brent Pierce canopy experiment
    • grew plants flat, angle, and almost verticle
    • absorbed most light at flat
  33. Erectophile
    upright leaves
  34. Phlanophile
    horizontal leaves
  35. Sciophytes
    Shade loving plants
  36. ∆ in leaf structure from light intensity
    • High PAR = well developed and highly organized palisade and spongy paranchima
    • Low PAR = poorly developed and organized paramanicha
  37. Harvest index
    grain dry matter / total dry matter

What would you like to do?

Home > Flashcards > Print Preview