Growth –  Private life of plants, BBC documentary (1995)
Cellular growth Photosynthesis products invested in: Respiration Biosynthesis proteins, amino acids, storage, other metabo...
Cellular growth - cell division Cell cycle
Cellulaire groei - cell expansion Module 2
Whole plant Growth + C-gain in photosynthesis -  C-loss in respiration
How to express growth?
How to express growth:
RGR depends on species and ontogeny:
Why do some plants grow faster than others?
How does a plant spend its daily fixed C? 15% Shoot respiration 15% Root respiration 70% Growth
Calculating plant growth RGR
Calculating plant growth RGR ULR
Calculating plant growth RGR LAR ULR
Calculating plant growth RGR LAR ULR PS A [C]
Calculating plant growth RGR LAR SLA LMF ULR PS A [C]
Calculating plant growth RGR Zie ook extra informatie in je handleiding LAR SLA LMF ULR PS A [C] * / * * *
Breakdown of RGR: 1. ULR  (  g. m -2  leaf. day -1 )
Breakdown of RGR: 1. ULR  (  g. m -2  leaf. day -1 ) 2. LAR  (m 2  leaf . kg -1  plant) *
Breakdown of ULR: 1. Daily rate of PS A
Breakdown of ULR: 1. Daily rate of PS A 2. Fraction of PS A  not respired *
Breakdown of ULR: 1. Daily rate of PS A 2. Fraction of PS A  not respired * 3. [C] /
Breakdown of LAR: 1. SLA  (m 2  leaf. kg -1  leaf) 2. LMF  (g leaf . g -1  plant) *
In formula: PS A  = daily photosynthesis  = mol C / (m 2 LEAF  . day) FCI = Fraction of fixed C Incorporated    = mol C fo...
Interspecific variation in RGR:
Interspecific variation: LAR variables
High and low light leaves: High light Thick leaf    Low SLA Low light Thin leaf    High SLA
Interspecific variation: LAR variables
High and low light leaves: High light Thick leaf    Low SLA Low light Thin leaf    High SLA
A molecular trick to decrease Rubisco: Sense: Antisense: DNA RNA Rubisco Rubisco X
b. Antisense Rubisco:
c. Antisense Rubisco:
Conclusions Growth: <ul><li>1. RGR: corrects for size </li></ul><ul><li>2. A high PS a  is not the same as a high RGR </li...
The green revolution: Module 3
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Plantenbiologie college 3 deel 2

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  • Assen omdraaien, RGR op de x-as.
  • Anti-sense hebben ze nog niet gehad!
  • Groene revolutie: niet fotosynthese maar verandering van allocatie! Vooruit verwijzen naar college sturing waar hierop verder wordt gegaan.
  • Plantenbiologie college 3 deel 2

    1. 2. Growth – Private life of plants, BBC documentary (1995)
    2. 3. Cellular growth Photosynthesis products invested in: Respiration Biosynthesis proteins, amino acids, storage, other metabolites. Cell walls (predominantly polysaccharides) of new and expanding cells.
    3. 4. Cellular growth - cell division Cell cycle
    4. 5. Cellulaire groei - cell expansion Module 2
    5. 6. Whole plant Growth + C-gain in photosynthesis - C-loss in respiration
    6. 7. How to express growth?
    7. 8. How to express growth:
    8. 9. RGR depends on species and ontogeny:
    9. 10. Why do some plants grow faster than others?
    10. 11. How does a plant spend its daily fixed C? 15% Shoot respiration 15% Root respiration 70% Growth
    11. 12. Calculating plant growth RGR
    12. 13. Calculating plant growth RGR ULR
    13. 14. Calculating plant growth RGR LAR ULR
    14. 15. Calculating plant growth RGR LAR ULR PS A [C]
    15. 16. Calculating plant growth RGR LAR SLA LMF ULR PS A [C]
    16. 17. Calculating plant growth RGR Zie ook extra informatie in je handleiding LAR SLA LMF ULR PS A [C] * / * * *
    17. 18. Breakdown of RGR: 1. ULR (  g. m -2 leaf. day -1 )
    18. 19. Breakdown of RGR: 1. ULR (  g. m -2 leaf. day -1 ) 2. LAR (m 2 leaf . kg -1 plant) *
    19. 20. Breakdown of ULR: 1. Daily rate of PS A
    20. 21. Breakdown of ULR: 1. Daily rate of PS A 2. Fraction of PS A not respired *
    21. 22. Breakdown of ULR: 1. Daily rate of PS A 2. Fraction of PS A not respired * 3. [C] /
    22. 23. Breakdown of LAR: 1. SLA (m 2 leaf. kg -1 leaf) 2. LMF (g leaf . g -1 plant) *
    23. 24. In formula: PS A = daily photosynthesis = mol C / (m 2 LEAF . day) FCI = Fraction of fixed C Incorporated = mol C for growth / mol C fixed SLA = Specific Leaf Area = m 2 LEAF / kg LEAF LMF = Leaf Mass Fraction = g LEAF / g PLANT [C] = C-concentration = mol C / g PLANT
    24. 25. Interspecific variation in RGR:
    25. 26. Interspecific variation: LAR variables
    26. 27. High and low light leaves: High light Thick leaf  Low SLA Low light Thin leaf  High SLA
    27. 28. Interspecific variation: LAR variables
    28. 29. High and low light leaves: High light Thick leaf  Low SLA Low light Thin leaf  High SLA
    29. 30. A molecular trick to decrease Rubisco: Sense: Antisense: DNA RNA Rubisco Rubisco X
    30. 31. b. Antisense Rubisco:
    31. 32. c. Antisense Rubisco:
    32. 33. Conclusions Growth: <ul><li>1. RGR: corrects for size </li></ul><ul><li>2. A high PS a is not the same as a high RGR </li></ul><ul><li>3. RGR variation much determined by LAR </li></ul>
    33. 34. The green revolution: Module 3

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