Summary
The photo-geo response comes about through the differential inhibition of cell growth on the two curved sides of the mesocotyl.
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References
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Mer, C.L. On the mechanism of the “photo-geo” response in the mesocotyl of oat seedlings. Planta 111, 179–182 (1973). https://doi.org/10.1007/BF00386278
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DOI: https://doi.org/10.1007/BF00386278