growth regulators

• a) natural and man made
• * 3 substances, 1 natural 2 synthetic
• b) 6 effects *

a) more cells ( cell division)

b) larger cells (cell elongation

a) changes from seedling to adult plant

b) stages as matures

= hormones

• a) chemical messengers
• b) trace amounts
• c)have more than 1 effect
• d)works with other hormones

• a) formed in 1 area
• b)moves
• c) functions in new area

effects:

• -stem and internode elongation
• -increases flower and fruit set
• -promotes seed germination

effects:

• a) cell division
• * used in plant tissue cultures
• b) slows aging

a) gas given off by plants

effects:

• -fruit rippening or aging
• -leaf drop (abscission)
• -shorter and thicker stems

a) inhibits growth

• b) causes dormancy
• - seed and bud dormancy

ex) why tree buds wont grow till spring

• a) possible hormone
• b) effects: promotes flowers
• -not sure if it exists

- IAA

-IBA

-24-D

natural version

rooting, synthetic

-rooting hormones

herbicide, synthetic


ex)weed-b-gone

-softens the cell wall, so the cells stretch

-too much can inhibit root formation

apical bud inhibits lateral buds

kills plants by overgrowing

-apical meristems

stem and petioles twisted, due to uneven growth

-growth responses to an environmental stimulus from one direction

ex) plant leans towards light