I've read that many plants have some sort of circadian rhythm where they perform a certain action on a cycle of about 24 hours, like the mimosa plant opening and closing its leaves. Obviously, this is done in order to synchronize with the sun, but many such plants continue to perform these actions even when left in constant darkness or light. It follows that this is the result of some sort of biochemical pathway, but whatever internal 'clock' is used is also independent of temperature.
How can these plants perform certain actions every 24 hours at different temperatures when the chemical reactions most biochemical pathways use are temperature dependent?
It would seem like the length of the cycle should vary widely according to the temperature as it affected the reactions involved, but instead it stays at a very constant length very close to 24 hours. How can this be?
(This is in my textbook, but unfortunately the book doesn't cite any studies. I would greatly appreciate it if anyone could help me find one to link to so I can improve the question. :)