Plant Responses to the Environment

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Plant Responses to the Environment
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Plants respond to many environmental stimuli
http//plantsinmotion.bio.indiana.edu/plantmotion/
starthere.html
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Fig 39.16
Plants respond to the direction of light
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How do plants detect light direction?
Fig 39.5
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How do plants detect light direction?The
response involves differential growth in the zone
of elongation
Fig 39.5
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How do plants detect light direction?How would
you test where the plant detects light?
Fig 39.5
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How do plants detect light direction?
Fig39.5
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How do plants detect light direction?Light
direction is sensed in the tip, but the response
occurs in the elongation zone
Fig 39.5
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How do plants detect light direction? The signal
originates in the tip and travels to the
elongation zone
Fig39.5
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How do plants detect light direction? The signal
is the plant hormone... auxin
Fig39.5
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Fig 10.6
Spectrum of light energy
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Photosynthesis Plants can make sugar using
energy from the sun, water from the ground, and
CO2 from the air.
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Action spectrum of photosynthesis
Fig 10.9
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Fig 39.17
Seedling germination may depend on light
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Light quantity and quality in different
environments
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Fig 39.17
Seedling germination may depend on light
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Fig 39.19
Phytochrome a reversible receptor
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Shade Avoidance
direct light
shade
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Why is phytochrome reversible?
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Plants respond to many environmental stimuli
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Fig 39.25
Plants respond to touch...which one was touched?
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Fig39.25
Plants respond to touch
touched
not touched
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Another touch response in Mimosa pudica
Fig 39.26
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Fig 39.28
Bad touch Herbivory
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Fig 39.28
Bad touch Herbivory
systemin
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Fig 39.28
Bad touch Herbivory
jasmonic acid
systemin
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Fig 39.28
Bad touch Herbivory
Protease Inhibitors
Protease Inhibitors
Protease Inhibitors
methyl jasmonate
jasmonic acid
Protease Inhibitors
systemin
Protease Inhibitors
Protease Inhibitors
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Fig 39.28
Bad touch Herbivory
Protease Inhibitors
Protease Inhibitors
Protease Inhibitors
methyl jasmonate
jasmonic acid
Protease Inhibitors
systemin
Protease Inhibitors
Protease Inhibitors
Ive got indigestion!
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Fig 39.28
Plants release several volatile chemicals to
signal other organisms
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Fig 54.1
Wasp larvae emerging from caterpillar
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Plants release several volatile chemicals to
signal other organisms
Plant biology Night moves of pregnant
moths Clarence A. Ryan (29 March 2001) Nature
410, 530-531
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Moth type and time
Plants release different volatiles depending on
who and when they are being eaten.
De Moraes C. M., Mescher M. C., Tumlinson J. H.
Nature 410, 577-580 (2001)
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Plants release several volatile chemicals to
signal other organisms
Plant biology Night moves of pregnant
moths Clarence A. Ryan (29 March 2001) Nature
410, 530-531
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Plant Responses to the Environment