Are Plants Sentient?

i think most every can agree that plants are alive... but are they sentient?

are there beings (other than Buddhas) that aren't sentient and thus can't reach enlightenment (in a future rebirth) or aren't effected by samsara?
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I understand sentient meaning feelings.. is that correct?
If yes, then researches did show that plants have feelings, and do react differently in case of pain, pleasure, enjoyment, music etc. I dont what kind of 'graph' they call it though.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/interfaith-dialogues/333-are-plants-sentient.html

If no, then I look forward to learned members' reply.

Regards.

Sentient means conscious, or capable of feeling and perceiving.
Reference:: Sikh Philosophy Network http://www.sikhphilosophy.net/showthread.php?t=333

To my knowledge, plants are not subject to samsara, but I could be wrong about that.