Living · 6 pages · 12 min
How phototropism bends a stem
The shaded side of the stem grows longer, so the tip curves toward the light.
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From the opening
Phototropism bends a stem because the side away from the light grows faster than the side toward the light. The tip curves toward the source as a result of that uneven lengthening, so the stem is not pulled by the light and it is growing into a curve. The opening covers shaded flank cells get longer, blue light and auxin split, and the tip senses, the stem bends.
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Inside
- Shaded flank cells get longer
- Blue light and auxin split
- The tip senses, the stem bends
- Old bends stay as kinks
- Where the idea stops applying
- A distinction worth keeping
Sources
- Darwin and son on coleoptile phototropism
- Phototropin and auxin-driven unequal elongation