Plant Propagation, Plant Hormones, Plant Responses

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Plant Propagation, Plant Hormones, Plant Responses

• Ch.24 25

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Compare/Contrast Table
Section 24-1
Comparing Plant Propagation Methods
Method Procedure
Cuttings
Grafting
Budding
Vegetative reproduction takes place naturally
parent plant puts out runners that grow new
plants (Ex. Strawberries)
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Hormones

• Substance that is produced in one part of an
  organism that affects another part of that same
  organism
• Main plant hormones
• Auxins
• Cytokinins
• Gibberellins
• Ethylenes

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Auxins

• Produced in the apical meristem
• Stimulate cell elongation regulate growth
• Result in plant bending in response to light
• Also result in stems going up and roots going
  down apical dominance
• Plants that have their tops trimmed out will get
  bushy plants that are slimmed from the sides
  will be thinner and taller

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Apical Dominance
Section 25-1
Apical meristem
Lateral buds
Auxins produced in the apical meristeminhibit
the growth of lateral buds.
Apical meristem removed
Without the inhibiting effect of auxinsfrom the
apicial meristem, lateral budsproduce many
branches.
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Cytokinins

• Produced in growing roots and in developing
  fruits and seeds
• Stimulate cell division and the growth of lateral
  buds
• Cause dormant seeds to sprout
• Cause cells to grow thicker

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Gibberellins and Ethylene

• G produce dramatic increases in size
  particularly in stems and fruit
• E in response to auxins, fruit tissues release
  ethylene which causes ripening

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Tropisms

• Are the responses of plants to environmental
  stimuli
• Gravitropism response to gravity
• Phototropism response to sunlight
• Thigmotropism response to touch

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Photoperiodism and Flowering
Section 25-2
Short-Day Plant
Long-Day Plant
Midnight
Noon Long Day
Midnight
Noon Short Day
Midnight
Noon Interrupted Night
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Compare/Contrast Table plant adaptations
Section 25-3
Comparing Carnivorous Plants, Epiphytes, and
Parasites
Characteristics Environment Method of obtaining
nutrients Examples
Carnivorous Plants bog leaves that trap and
digest insectspitcher plant, sundew, Venus
flytrap
Epiphytes host plant Rainfallproduce their own
food Spanish moss, orchid
Parasites host plant extract moisture and
nutrients from host plant mistletoe