07%20Growth%20Development%202

07%20Growth%20Development%202 - Plant Growth and...

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Plant Growth and Development part 2 Objectives of today's lecture Learn how plants respond to different environmental signals and conditions Introduce some of the hormones that plants use to control their growth Discuss some applications of plant growth regulators in horticulture
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What environmental factors affect plant growth? Light Temperature Water Nutrients Atmosphere Gravity Plants are able to perceive all of these environmental factors and adjust their growth to deal with these conditions Why? How?
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Light The light environment is critical for many different aspects of plant growth Are these the right conditions for a seed to germinate? Is there sufficient light for the plant to perform photosynthesis? Are the light conditions not optimal for plant growth? Is this the right time to flower?
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Light Plants are able to sense and adapt to many different aspects of the light environment Presence or absence of light is it light or dark? Quantity of light intensity - full sun or shade Quality of light wavelength of light
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Light and seed germination Lettuce seed will only germinate efficiently in the light Germination is inhibited in the dark Is this true for all seeds? Why is it important for lettuce? How does a seed see?
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Movies of Plants-in-Motion Roger Hangartner at Indiana University has an excellent web site devoted to the movement of plants Plants in Motion web site Please look at these movies Enter the web site, select one of the topics from the menu on the left (e.g. tropisms), then select one of the movies (e.g. corn phototropism). Enjoy.
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"I have seen the light" These bean seedlings were germinated either in the dark or in the light What differences do you see?
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