Earlier quoted context omitted.
The line for sentience is a very low bar to hurdle. Trees may demonstrate sentience [0]. The larger problem is that people are generally thinking of sapience, but sapience tends to be defined in axiomatic terms, so we don't have a clear understanding of what it requires or means. [0] https://nph.onlinelibrary.wiley.com/doi/full/10.1111/j.1469-...
I don't see how your link supports trees potentially being sentient.
Sentient is defined as able to perceive or feel things.
The paper linked discusses how trees can “communicate” and “feel” based on release of specific chemicals.
An exert from the introduction: “Recent research has revealed that plants can sense their neighbours without direct physical contact; mechanisms for this include detection of a reduced ratio of red to far-red in light reflected from neighbouring foliage…”
This was also a plot of a terrible M. Night Shyamalan movie.
That’s the connection the poster suggested, as the bar for sentience is quite low.