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Plant Responses

Plant Responses. How plants move and communicate. Tropisms. Tropisms are the growth of a plant toward or away from a stimulus, including: Phototropism: in response to light Gravitropism (geotropism): in response to gravity Thigmotropism : in response to touch

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Plant Responses

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  1. Plant Responses • How plants move and communicate

  2. Tropisms • Tropisms are the growth of a plant toward or away from a stimulus, including: • Phototropism: in response to light • Gravitropism (geotropism): in response to gravity • Thigmotropism: in response to touch • Auxins are plant growth hormones that promote elongation of cells

  3. Tropisms: cell elongation • In general, tropisms involve cell elongation or suppression of cell elongation on one side of a plant, causing the plant to grow in a particular direction.

  4. Phototropism • Look at the sprouts in the bottom picture and the explanatory diagram at the top.

  5. Gravitropism • In this plant, shoots grow upwards and roots grow downwards in response to gravity. • On which side of the shoot and root do you think auxins are more concentrated?

  6. Gravitropism in roots • In roots, however, auxin concentration on the lower side of the root suppresses cell elongation. • The upper side of the root continues to grow, causing the roots to bend downward.

  7. Thigmotropism • In some plants, vining stems or tendrils will grow in response to touch.

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