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Plants may form memories

Meet the doctor who prescribes fruit and vegetables instead of drugs!

Prions – those infamous proteins linked to mad cow disease -may be responsible for memory in plants.

The proteins may help plants change their activity based on past events, helping them decide when to flower, for instance.

That plants have memory is well known. For instance, certain plants flower after a prolonged exposure to cold. But if the conditions are not right following the cold, the plant will delay flowering until temperature and light are just right. This suggests that plants “remember” the exposure to cold.

You can even take tissue from such plants and grow a new plant, and it, too, will remember the encounter with the cold, and flower accordingly.
https://www.newscientist.com/article/2085770-plants-may-form-memories-using-mad-cow-disease-proteins/