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Phototropism

Phototropism . Directional Information Blue Light Stem Bending Toward Light Lateral Redistribution of Auxin Auxin High on Shaded Side Increased Growth Stomatal Opening Blue Light Activation of ATPase H+ ion extrusion K+/Cl- Uptake H2O uptake

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Phototropism

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  1. Phototropism • Directional Information • Blue Light • Stem Bending • Toward Light • Lateral Redistribution of Auxin • Auxin High on Shaded Side • Increased Growth • Stomatal Opening • Blue Light Activation of ATPase • H+ ion extrusion • K+/Cl- Uptake • H2O uptake • Swelling of Guard Cells

  2. Phototropism

  3. Plants in Motion

  4. Phototropism • Leaf Movements • Heliotropism - Legumes • Pulvinus • Similar to Stomatal Opening • Multicellular • H+ / K+, Cl- exchange ---> H2O uptake ---> Swelling • Dorsal <---> Ventral • Dorsal swell ---> Leaf moves down • Ventral swell ---> Leaf moves up

  5. Leaf Movements • Pulvinus

  6. Leaf Movements

  7. Leaf Movements

  8. Plants in Motion

  9. Phototropism

  10. Blue Light Action Spectrum

  11. Stomatal Opening Light DARK

  12. Blue Light Response

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