by Dilip Kumar Chandra PGT Biotechnology JNV Raipur CG

1. Controls of growth, developmentControls of growth, development
and movementand movement
By Dilip Kumar Chandra

2. Cell division.Cell division.
Cell enlargment.Cell enlargment.
Cell differentiation.Cell differentiation.

3. Primary growthPrimary growth
Apical meristemApical meristem
Leaf primordiaLeaf primordia
Forming axillary budForming axillary bud
Ground meristemGround meristem
protodermprotoderm
procambiumprocambium

4. Secondary growthSecondary growth
xylemxylem
Phloem withPhloem with
bands of fibersbands of fibers
Vascular cambiumVascular cambium
Ray parenchymaRay parenchyma
corkcork

5. Scarification
mechanical
chemical
heat
Mobilization of reserves

7. Turgor movements (changes in turgor pressure in
selected cells)
Growth movements (elongation of selected cells in
response to stimulus)
phototropism
geotropism
thigmotropism

10. Directional movements in response to a
directional stimulus

13. GeotropismGeotropism

16. Signal molecules produced at specific locations.
Occur in low concentrations.
Cause altered processes in target cells at other
locations.

17. Artificially synthesized substances which
produce hormone like responses

18. Auxins
Gibberellins
Cytokinins
Abscisic acid
Ethylene

20. Auxin associated with phototropism - early experimentsAuxin associated with phototropism - early experiments
demonstrate tip as receptor.demonstrate tip as receptor.

21. Demonstration of transported chemicalDemonstration of transported chemical

22. Discovered as substance associated with
phototropic response.
Occurs in very low concentrations.
Isolated from human urine, (40mg 33 gals-1
)
In coleoptiles (1g 20,000 tons-1
)
Differential response depending on dose.

25. abscission - loss of leaves
flower initiation
sex determination
fruit development

28. infecteduninfected

29. General cell elongation.
Breaking of dormancy.
Promotion of flowering.
Transport is non-polar, bidirectional producing
general responses.

31. Promotes cell division.
Morphogenesis.
Lateral bud development.
Delay of senescence.
Stomatal opening.
Rapid transport in xylem stream.

33. General growth inhibitor.
Causes stomatal closure.
Readily translocated.
Produced in response to stress.

34. H H
/
C = C
/
H H

35. Gaseous in form.
Rapid diffusion.
Affects adjacent individuals.
Fruit ripening.
Senescence and abscission.
Interference with auxin transport.
Initiation of stem elongation and bud
development.

36. Constitutive enzymes - always present but
level of hormone can affect level.
Adaptive enzymes - formed or activated as a
result of the presence of a hormone.

38. Interaction of cytokinin and auxinInteraction of cytokinin and auxin
in tobacco callus tissuein tobacco callus tissue