Tropisms - Reaching out—to water and fence posts
Reaching out—to water and fence posts
Two growing behaviors do not seem to be controlled by auxins. A behavior called hydrotropismThe tendency of roots to grow toward a water source. causes roots to grow toward a water source. This behavior is controlled by cells in the growing areas of the roots that are sensitive to the presence of water. The root cells grow at different rates, bending the root in the direction of the water. Growing toward water increases the plant's chances of survival.
The second behavior occurs in vines and climbing plants and is called thigmotropismThe tendency for a plant to grow toward a surface it touches.. Thigmo- means "touch"; thigmotropism is the tendency for a plant to grow toward a surface it touches. Vines and climbing plants have delicate stems...
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