Describe an experiment he could carry out to show that auxin causes bending of a
shoot.
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Phototropism
Phototropism refers to movement in response to light.
The Darwins’ (Charles and son Francis) experiment.
plant bends in response to light
block light in bending area (collar) ® plant bends
remove or cover tip ® plant does not bend
conclusion- tip sends signal
Frits Went
removed tip of oat seedling
placed on an agar [gelatin] block
placed agar on decapitated oat seedling (grown in dark)
bent away from side w/ agar block
conclude- substance (he called auxin) caused cells to grow.
Illumination results auxin moving to the dark side of stem tips. As this auxin diffuses down the dark side of the stem, the cells respond by enlarging. This causes the plant to bend toward the light.
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