Ch 39

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  1. Auxin produced in _____ supresses lateral bud growth
  2. Polar transport of auxin
    auxin goes from top to bottem
  3. Cytokinins (function)
    regulate cell division
  4. Roles of cytokinins
    • produced in roots
    • promotes lateral shoot growth
    • (opposite auxin)
  5. Auxin: cytokinin ration
    controls root and shoot balance
  6. Gibberellins (function)
    • stimulate growth
    • internode elongation (larger fruits)
  7. Environmental control of stomata opening
    Image Upload 1
    • light
    • Image Upload 2
  8. Environmental control of stomatal opening
    Abscisic acid (dry signal)
  9. Image Upload 3
    Image Upload 4
  10. Ethylene gas
    • simplest plant hormone
    • causes fruit to ripen
    • flowers and leaves to fall off
  11. Healthy shoot rquires _____( 2 hormones)
    Auxin and Ethylene
  12. If excess Ethylene
    Abscission and weakened leaf
  13. First signal in HR response
    AVR produced by pathogen binds R (resistance) produced by plant
  14. HR
    Hypersensative response
  15. Second messgae of HR response
    Nitric Oxide
  16. Third response of HR
    • kills pathogen
    • kill infected cells
    • thicken plant wall
  17. SAR
    Systemic acuired resistance
  18. Jasmonic acid
    Proeinase inhibitor (make herbivores sick)
  19. Plants can sense:
    • light
    • gravity
    • day length
    • temperature
    • physical touch
    • damage
  20. Signal transduction
    converting stimulus into response
  21. 4 steps of signal transduction
    • External stimulus
    • Phosphorylation
    • secondary (internal) message phosphorylation cascade Ca+2 2nd messenger
    • cellular response: gene and protein regulation
  22. Hormone
    signiling molecuels transported through the body
  23. Phototropism
    movement in response to blue light
  24. Steps of Phototropism
    • stimulus
    • phosphorylation of membrane protein: phototropin
    • Response at tip is hormone redistribution
  25. in shoot auxin is on ___ side
  26. auxin _______ growth in shoot
  27. posotive gravitropism
    towards gravity
  28. negativ gravitropism
    away from gravity
  29. gravitropism
    movement in response to gravity
  30. Statoliths
    startch grains that halep sense gravity
  31. thigmotropism
    can sense touch
Card Set
Ch 39
Biology exam IV
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