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plant_movement

Plant hormones

There are five general classes of hormones: auxins, cytokinins, gibberellins, ethylene, and abscisic acid. for more details see plant biology

Types of Movement

“Plants in motion”, A great collection of short time lapses showing plants in motion http://plantsinmotion.bio.indiana.edu/plantmotion/starthere.html

Phototropism

  • movement in response to light.
  • shoots grow toward light and are positively phototropic; roots grow away from light and are negatively phototropic.
  • IAA increase in shaded side → plant curve toward light
  • wavelengths less than 500μm—is most effective in producing a growth response.

Gravitropism

  • response to gravity

Thigmotropism

  • reaction to a solid object
  • eg. tendrils of climbing plants wrapping around a support
  • IAA (lengthening) and ethylene (contracting) are probably involved

Other

via Tropism

  • Chemotropism, movement or growth in response to chemicals
  • Gravitropism (or geotropism), movement or growth in response to gravity
  • Apogeotropism, the inclination to behave contrary to gravity
  • Hydrotropism, movement or growth in response to moisture or water
  • Heliotropism, movement or growth in response to sunlight.
  • Selenotropism, movement or growth in response to the moon.
  • Scototropism, movement or growth towards shadow.
  • Phototropism, movement or growth in response to lights or colors of light
  • Thermotropism, movement or growth in response to temperature
  • Thigmotropism, movement or growth in response to touch or contact
  • Autotropism, inclination of plants to grow in a certain direction or to return to a previous (or is it prior) form

Reading / / Notes

plant_movement.txt · Last modified: 2009/12/12 11:38 by maja