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Sarah Tolch

AccessScience | Research Update | Phototropin - 1 views

www.accessscience.com/content.aspx

shared by Sarah Tolch on 09 Apr 10 - Cached
  • Typically, stems show positive phototropism (movement toward the light), whereas roots exhibit negative phototropic movement (away from the source of light).
  • Arabidopsis contains two phototropins referred to as phot1 and phot2. Mutants of Arabidopsis lacking both phototropins lose their phototropic responsiveness
  • Phototropic response
  • ...10 more annotations...
  • phototropins control the movement of chloroplasts
  • these responses serve to enhance the photosynthetic
  • Phototropins, like photoreceptor pigments associated with mammalian vision, comprise many amino acids (900–1000) that form the main structure of the protein (the apoprotein) to which an accessory chemical cofactor is bound that can absorb light and impart color (the chromophore)
  • a small fraction of the receptor pool is rapidly internalized (within minutes) upon blue light irradiation
  • Phototropins are typically associated with the plasma membrane
  • However, the biological significance
  • As light passes through the stem, it becomes progressively diffracted, thereby generating a gradient of phototropin activation across the organ, with the highest level of activity occurring on the irradiated side
  • In some plant species, including the fern Adiantum capillus-veneris, phototropism and chloroplast movement are induced by red light as well as blue.
  • novel
  • The presence of such a hybrid photoreceptor is proposed to enhance light sensitivity and aid the prevalence of species such as ferns in low light conditions
Lexi B

Plant Physiology Online: Phototropism: From Photoperception to Auxin-Dependent Changes ... - 0 views

4e.plantphys.net/article.php

bollis light

shared by Lexi B on 13 Apr 10 - Cached
  • Phototropism—the directional curvature of organs in response to lateral differences in light intensity and/or quality—represents one of the most rapid and visually obvious responses of plants to changes in their light environment
  • In nature, stem phototropism likely provides plants with an effective means for maximizing photosynthetic light
  • signal-response components mediating the basal UV-A/blue light-induced phototropic response in seedlings.
  • ...2 more annotations...
  • Phototropism has been the subject of study for more than 120 years
  • Photoreceptor molecules, the phototropins, capable of perceiving directional UV-A/blue light cues have been identified and characterized.
emily shy

Does Music Affect Plant Growth? | eHow.com - 0 views

www.ehow.com/music-affect-plant-growth.html

interesting music plant growth

shared by emily shy on 13 Apr 10 - Cached
  • Plants do like noise. Plants exposed to a set frequency of sound tend to germinate more quickly, grow taller and weigh more than those kept in silence. Both 50,000 hz ultrasound (above the human hearing range) and 5,000 hz sound seem to work. Therefore, there's a good chance that plants like any sound you might play for them, including music.
  • Plants also like good, attentive care. If you are playing music you like for a plant, it may lead you to take better care of it. You will be more likely to carefully water and feed the plant and make sure it has good light. It might look like the music helps the plant grow, when you are actually taking better care of it. Plants like carbon dioxide. If you are standing by a plant, singing to it, it is going to absorb some carbon dioxide from your breath. This could help it to grow more quickly.
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