arjand wrote: ↑March 11th, 2021, 5:45 pm
Inquinsitive_mind wrote: ↑March 10th, 2021, 10:04 pm
I agree, yet disagree with this sentiment. As plants do not have pain receptors, they cannot experience pain in the same way that we understand it. I think the concept of pain as you mention above is more similar to the idea of self-preservation or self-defense, rather than an emotion. I do not believe that plants are capable of an emotional response and the "pain" that they exhibit is more of a physiological or natural response.
It is a fact that plants are organisms, as it is a fact that an innate characteristic of all organisms is reproduction. If a plant is killed, it cannot reproduce and spread its genes to other plants of the same species, resulting in a lack of environmental diversity. To prevent this from happening, I believe these expressions of "pain" that we observe in plants is simply a defense mechanism. Therefore, I would venture to say that, no they do not experience pain (as an emotional response), however, do respond to threatening stimuli by way of complex communication from within the plant itself.
I do not believe that it is valid to consider that what humans can 'see' as a pain expression in plants, is merely a 'mechanism'. It would be similar to René Descartes's argument that pain expression in animals is merely a 'mechanism'.
René Descartes: "animals have no mind, torture them all you want"
link
One could wonder: how is it possible that a profound philosopher (the father of 'modern philosophy') perceived pain expression in animals as a 'mechanism'? It may be evidence that an empirical perspective is not likely to be able to provide a valid ground for the determination of actual significance of pain expression.
Perhaps one should consider the question "why do plants exist?". From such a perspective, that which provides significance to the concept pain in animals may be applicable for plants in a similar manner.
Evidence for the physiological foundation for plant neurobiology is only recently discovered (in the past years).
(2019) Researchers: Yes, Plants Have Nervous Systems Too
The really remarkable part is that “these channels are activated by extracellular glutamate, a well-known mammalian neurotransmitter”. “Faster than can be explained by diffusion” means that the transmission appears to be a signal.
link
(2018) Do Plants Behave Like Animals?
There’s no doubt that plants do some amazing things. When being eaten by caterpillars, cotton plants release signals that attract insect-eating parasitic wasps to attack the caterpillars. Bean plants in close proximity to each other communicate if one is under attack.
link
You claim that plants' sense of pain cannot be reduced to simply a biological mechanism, however, two of the articles you provided describe the biological mechanism that occurs when part of a plant senses danger. The ideas of René Descartes are outdated, as these ideas were articulated in the 1600s. Today, we know that most animals are sentient beings who sense pain in a way that is similar to how humans experience pain, through pain receptors.
As I am new to the forum, I do not know how to attach links (the web page will not let me post a reply containing a URL), however, Britannica published an article written by Melissa Petruzzello entitled "Do Plants Feel Pain?". This article describes that plants do not sense pain in the way that we understand it. Some examples provided in the article include uprooting a carrot or trimming a hedge. Do you believe that this causes physical pain to the plant in the same way that you would feel pain if I were to cut off one of your limbs? Or if I were to remove a limb from an animal, such as a dog? If yes, then I would say that the current science surrounding the issue contradicts that belief, as plants have no pain receptors, no brain, no nerves. If no, then I would say that we have reached an agreement on the issue considering what type of pain plants experience.
If plants do not have experience the same excruciatingly negative feelings that we humans associate with pain, then the only other explanation for what pain plants experience, would be a biological mechanism to prevent the death of the overall plant or other plants in the same area. One excerpt from the article named above reads, "While this remarkable response is initiated by physical damage, the electrical warning signal is not equivalent to a pain signal, and we should not anthropomorphize an injured plant as a plant in pain.". I think this excerpt sums up the idea of the claim that I am making, that is, plants can sense damage, and interpret that damage as negative. However, that does not necessarily translate to pain, as we have defined it, or as we experience it as humans and animals.
Furthermore, I think it is important to consider that there are some organisms that are classified as animals, which to our current scientific knowledge are non-sentient and do not experience pain as humans or other sentient-animals do. These include animals lacking a central nervous system, i.e. sponges, hydras, anemones, and coral. I think it is an interesting question to consider whether or not these organisms should deserve a moral status equal to other sentient organisms.