BI+107+Chapter+39

BI+107+Chapter+39 - Chapter 39 Plant Hormones Fig. 39-2 )...

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Chapter 39 Plant Hormones
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Fig. 39-2 a) Before exposure to light (b) After a week’s exposure to natural daylight
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Fig. 39-3 CELL WALL CYTOPLASM Reception Transduction Response Relay proteins and second messengers Activation of cellular responses Hormone or environmental stimulus Receptor Plasma membrane 1 2 3
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Fig. 39-5b RESULTS Light Tip removed Darwin and Darwin: phototropic response only when tip is illuminated Tip covered by opaque cap Tip covered by trans- parent cap Site of curvature covered by opaque shield
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Fig. 39-5c RESULTS Light Boysen-Jensen: phototropic response when tip is separated by permeable barrier, but not with impermeable barrier Tip separated by gelatin (permeable) Tip separated by mica (impermeable)
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Fig. 39-6 Excised tip placed on agar cube RESULTS Growth-promoting chemical diffuses into agar cube Agar cube with chemical stimulates growth Offset cubes cause curvature Control (agar cube lacking chemical) has no effect Control Went’s Experiment
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BI+107+Chapter+39 - Chapter 39 Plant Hormones Fig. 39-2 )...

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