Week 13, Lecture 1, Plant Movement

Week 13, Lecture 1, Plant Movement - 4 TYPES OF TROPISMS...

Info iconThis preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
Plant Movement Chapter 31 PLANT TROPISM What is Tropism? ± A growth movement whose direction is determined by the direction from which the stimulus strikes the plant. 4 TYPES OF TROPISMS ± Phototropism ± Geotropism or Gravitropism ± Hydrotropism ± Thigmotropism 35.3 Plant Responses to the Environment: Movements ± Phototropisms are responses to light ± Gravitropism orients plant parts to the pull of gravity ± Thigmotropism and thigmomorphogenesis are responses to physical contact ± Nastic movements are nondirectional PHOTOTROPISM ± Response to light
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
± Growth responses to directional light source ± Blue light receptors trigger auxin transport ± Auxin triggers differential cell elongation ± Enables leaves to be in best position to receive as much sunlight as possible Positive Tropism ± Grows in the direction from which the stimulus originates . Phototropism in Seedlings Fig. 35.19, p. 817 a. Seedlings bend toward light. Fig. 31.26 d. The auxin-stimulated cells elongate more quickly, causing the seedling to bend. b. Rays from the sun strike one side of a shoot tip. c. Auxin (red) diffuses
Background image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}

Page1 / 7

Week 13, Lecture 1, Plant Movement - 4 TYPES OF TROPISMS...

This preview shows document pages 1 - 3. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online