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Chapter 37 - Plants Growth and Development Understand the...

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Plants Growth and Development Understand the concept of plant tropism. Be able to explain what occurs in phototropism, gravitropism and thigmotropism. Review the concepts of cell-to-cell communication covered earlier in the semester (Chapter 6). Be familiar with the functioning of enzyme-linked receptors. Be able to explain the functioning of auxins and their role in plant growth.
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Plants Growth and Development Be able to describe the effect that cytokinins, ethylene, and abscisic acid have on plant growth and development. Have a general understanding of the affects of newly discovered plant signaling molecules such as brassinosteroids, jasminates, salicylic acid, systemin and oligosaccharins.
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Plants Growth and Development Be able to explain the concept of photoperiodism. Be able to describe the four types of photoperiodism observable in plants. Understand the role that the various phytochromes play. Be able to explain how the phytochromes function.
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Plants Growth and Development What regulates how and when a plant will grow? Tropisms Hormones (and Hormone-Like Molecules) Light
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Tropisms Directional growth response Irreversible Positive (+) or Negative (-) Regulated by hormones (+) = growth toward a stimulus (-) = growth away from a stimulus
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Phototropism Light Most shoots (+) Regulated by blue light Requires a photoreceptor (light sensitive substance)
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Phototropism Photoreceptor light sensitive substance Phototropins light-activated protein kinase Signaling pathway
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Gravitropism Gravity (+) roots root cap amyloplasts (-) stems Hormone auxin
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Thigmotropism Mechanical stimulus solid object contact Tendrils Climbing plant
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Hormones Auxins (Indoleacetic acid, IAA) Gibberellins (Gibberellic acid, GA 3 ) Cytokinins Ethylene Abscisic acid
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