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  • Anyone who has travelled across multiple time zones and suffered jet lag will understand just how powerful our biological clocks are. In fact, every cell in the human body has its own molecular clock, which is capable of generating a daily rise and fall in the number of many proteins the body produces over a 24-hour cycle. The brain contains a master clock that keeps the rest of the body in sync, using light signals from the eyes to keep in time with environment. Plants have similar circadian rhythms that help them tell the time of day, preparing plants for photosynthesis prior to dawn, turning on heat-protection mechanisms before the hottest part of the day, and producing nectar when pollinators are most likely to visit. And just like in humans, every cell in the plant appears to have its own clock. But unlike humans, plants don’t have a brain to keep their clocks synchronized. So how do plants coordinate their cellular rhythms? Our new research shows that all the cells in the plant coordinate partly through something called local self-organization. This is effectively the plant cells communicating their timing with neighboring cells, in a similar way to how schools of fish and flocks of birds coordinate their movements by interacting with their neighbors. Previous research found that the time of the clock is different in different parts of a plant. These differences can be detected by measuring the timing of the daily peaks in clock protein production in the different organs. These clock proteins generate the 24-hour oscillations in biological processes. For instance, clock proteins activate the production of other proteins that are responsible for photosynthesis in leaves just before dawn. We decided to examine the clock across all the major organs of the plant to help us understand how...