Plant responses (UEB contracted)

By: Rnib

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Synopsis: This page shows three images of a sprouting bean. There is a locator dot shown, which will be at the top left, when the image is the correct way up. The root is to the left and the shoot to the right. In the middle is the rounded shape of the bean. The top image shows the bean when it has just been laid in a dark cupboard. The auxin hormone is evenly spread in the shoot and root. In the second image gravity has caused the auxin to accumulate in the lower half of the shoot and root. In the last image the root has grown more on the side with the least auxin causing it to bend down. The shoot has grown more on the side with the most auxin causing it to bend up. When the root and shoot are vertical the auxin is spread evenly and so the bending stops.