CHAPTER 39 PLANT

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CHAPTER 39 PLANT RESPONSES TO INTERNAL AND
EXTERNAL SIGNALS
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Dark grown potato Light induced greening
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Synthetic auxins-2-4-D effects dicots causing
them to grow themselves to death Also used in
rooting hormones but in very low concentrations.
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Apical Dominance Axillary buds develop when
terminal bud is removed
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Foolish Seedling Rice on right is infected with
fungus that produces gibberellins
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Dwarf peas on right treated with gibberellins
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Control Gibberellins
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Germination of mutant corn seed due to blocking
of abscisic acid
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Ethylene induced triple response
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Leaf abscission due to ethylene gas induces
apoptosis of cells
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Blue-light on phototropin
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Dark Red Red Far
red
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Sleep movementsCircadian
rhythms
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Thigmomorphogenesis
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Flooding
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