Pain is defined as a neurological signal to your brain. Plants lack brains so they cannot have pain by that definition. If you have a different definition of pain based on the general idea of sensing pain not requiring a brain and neurons, then whether or not plants can feel pain depends on how you define pain.
I’ll say that purely as someone in the neuroscience field, absolutely not into vegetal physiology so take that with a grain of salt, someone with a background in vegetal physiology feel free to chime in.
I would say no. Pain is the interpretation of nociceptive signals. Nociceptive signals are roughly danger signals detected by the organism, like when you cut yourself you will send a nociceptive signal to your brain, your brain will interpret it as pain.
Thus you need a nervous system to be able to integrate noxious stimuli as pain and thus feel pain. Plants do not have nervous system so they can’t feel pain.
However, I wouldn’t be surprised if they can still react to noxious stimuli from the exterior by detecting molecules related to a lesion. It wouldn’t be that they feel pain but that they can react to tissular damages.
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