It is known that many plants typically die when exposed to temperatures of 40 to 50°C (I believe, these figures relate to exposure times of ~1–2 hours). When a plant is heated, what is the mode of action at the cellular level that results in the death of the plant? What are the main mechanisms involved?
P.S. I have read that at high temperatures plants synthesize heat-shock proteins, so I am not sure if this plays a role in the death of the plant. Another obvious effect following heating is the damage/denaturation of some chlorophylls (but a plant should be able to survive the loss of some photosynthesis; e.g. detaching leaves will not kill a plant).
Any explanation is greatly appreciated.