AGRY 525 Exam II

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Author:
MRK
ID:
268528
Filename:
AGRY 525 Exam II
Updated:
2014-04-10 14:12:53
Tags:
growth develo from online
Folders:

Description:
growth and development
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  1. Root growth
    • Elongation: apical meristem
    • Girth: lateral meristem (dicots mostly)
    • Low CHO: root growth goes way down
  2. Stem Growth
    • Apical meristem: initiating nodes, internodes, small amount of elongation
    • Intercalary meristem: most of growth
  3. Leaf growth (monocots)
    leaf intercalary meristem
  4. Difference btw root stem and leaf in Dicot/monocot
    • Root: D- apical, lateral M- apical
    • Stem: D&M- apical, Intercalary
    • Leaf: D- apical, Marginal M- Apical, Intercalary
  5. where does growth happen
    lowest 3 cm of the leaf
  6. Dicot leaf growth is really
    basal oriented
  7. Tall fescue leaf growth habits
    • Forage type: more cells dividing and elongating further away from the leaf base
    • Turf type: slower growth, division and elongation closer to stem base.
  8. Leaf growth and cell division under shade
    goes down
  9. 12 hour night with flash
    • Pfr is decaying to Pr but flash sends all back to Pr and decay process has to start over again
    • therefore Pfr is around and short day plants can't flower
  10. plastochron
    interval btw appearances of new leaf
  11. calculating division/ cell column/day
    • 1 mm = 1000 µm
    • cells/leaf x .% of growth
    • cells/leaf = leaf length mm/(cell length/1000)
    • .% of growth = leaf elongation/length of leaf
  12. Serial Sampling
    • Isn't very good b/c plant-plant variablity
    • range can be 3 fold
  13. CGR
    • ∆w/∆t
    • not linear = use calculus for dry weight (derivative)
    • if x2 + 6x - 4.9 use 2t + 6
    • For CGR use integration
    • = LAI x NAR
    • increase yield by keeping CGR higher, longer
  14. Negative CGR?
    • hail, drought cut
    • night
    • germination
  15. NAR
    • Net assimilation rate
    • estimate of efficiency
    • = (w2-w1)(lnLA2-lnLA1)/(LA2-LA1)(t2-t1)
    • Affected by dark respiration, exudates, stored reserves, and age
    • decreases with increased leaf area
  16. Change CGR
    • Increase N = sharper initial uptake
    • increase water = better growth rate
    • closely tied with yield
  17. CGR v. LAI
    • There is a critical leaf area
    • law of diminishing returns ~ 95%
    • CGR:interception = 1:1
  18. LAR
    • Leaf Area Ratio
    • Partitioning of dry matter into leaf
    • LAR = 1/2(a1/w1 + a2/w2)
    • After planting values are low (b/c roots first)
    • dm2/g
    • graph is exponetial to plateau after 2-3 weeks
    • C3 tend to have greater LAR, perhaps compensating
  19. RGR
    • Relative Growth Rate
    • Use when plants differ in inital size
    • Growth efficiencies
    • g of dry matter / grams of existing / time (g/g/day)
    • RGR = (lnw2-lnw1)/(t2-t1)
    • values up to 60%
    • small changes = big difference
    • RGR = LAR (partitioning) x NAR (efficiency)
  20. Winter wheat v. Spring wheat
    • CGR is higher for winter- more leaf area
    • spring wheat peck is further back
  21. NAR v. CGR in winter wheat
    • NAR down for winter w/ N b/c shading
    • CGR is higher because more LAI
    • Spring has higher NAR but lower LAI so growth rate is down
  22. NAR over time
    • declines b/c
    • increase shading
    • increased average age = Ps down
  23. NAR v. RGR
    • Very similar, LAR is similar
    • Lower Rd has higher efficiency in both
  24. RGR v. LAR
    • as RGR increases so does LAR
    • C3 have higher LAR to increase CGR
  25. C3 v. C4 CGR
    • C4 higher & steeper curve
    • NAR higher (Ps)
    • Don't take over b/c cold sensitive
  26. Term for no G x E
    homoeostatsis
  27. Protein Kinase
    What puts the P on Nitrate reductase

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