14 Control of Plant Development II

14 Control of Plant Development II - Lecture 14: Control of...

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Lecture 14: Control of Plant Development Apr.23.07
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Factors controlling plant growth Two types of factor control growth and development Endogenous factors Exogenous factors
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Exogenous factors Light Gravity Biological clock Temperature Mechanical stimuli Water Nutrients
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What happen when plants grow in the dark?
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Light White light is separated into the different colors (wavelengths)
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By Plant Photoreceptors How is light absorbed by plants?
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A pigment (chromophore) containing protein What is a photorecptor? A chromophore attached to a protein= photorecptor Chromophore: Light absorbing portion of a molecule
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Plant Photoreceptors Phytochromes Cryptochromes Phototropins
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Etiolation?
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Etiolation? Light
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Phytochromes
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Absorption spectra of phytochrome
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Phytochrome-mediated effects on germination R R-FR R-FR-R R-FR-R-FR
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Plants sense neighbors by monitoring the Red/Far-red ratio
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Shade avoidance “Sunny” “Shady” • Plants sense changes in the low red to far-red ratio using phytochrome • Plants respond to low red to far-red ratios by elongation • This allows them to compete with their neighbors for light.
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Control FR treatment FR-R treatment
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14 Control of Plant Development II - Lecture 14: Control of...

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