We already knew that plants can detect odours, of course. But apparently they might be really good at it, albeit slow.
"Plants can't run away, so of course they react to odours more slowly than animals. If plants can prepare for environmental change within the same day, that is probably fast enough for them," said Touhara.
Speed is unnecessary for plants, but they may be able to recognize a much greater variety of odour molecules.
"Humans have about 400 odour receptors. Elephants have about 2,000, the largest number in animals. But based on how many transcription factor genes are in plants, plants may be able to detect many more odors than animals," said Touhara.
https://www.technologynetworks.com/genomics/news/no-nose-no-problem-scientists-discover-that-plants-can-smell-314424
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