Plants Use Body Clocks to Prepare for Battle
Lest I gave the impression that the animal immune system was using the circadian clock but the plant defense system was not, we have this:
Some of the circadian-regulated genes are linked to wounding or healing responses, meaning that they can anticipate an attack from insects just as they anticipate the sunrise.
This is really cool work, showing that plants use circadian regulation of defense compounds to provide maximum protection at the most likely time of insect feeding.
Gravitropic 