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Sunflowers rotate in the direction of the Sun. In a study published in Science, researchers found that sunflowers' biological clock and light-detecting ability work together, activating genes involved in development at the right time. the tree trunk bends the Sun's arc. The team also showed that, when fully grown, in some cases as tall as humans, the trees would always head east for a fresh start, to be warmed by the Sun to attract insects. chalk.

Stacey Harmer and Hagop Atamian, plant biologists at the University of California, together with Davis and their colleagues studied sunflowers in fields, pots and growth chambers. They found that plants grow more slowly than those exposed to sunlight. Chasing the Sun promotes plant growth. The fact that the sunflowers turn to the east again at night, for no particular reason, may be due to the action of the biological clock. The researchers placed sunflowers in a room with a light that mimicked the path of the sun during different light and dark cycles. Plants behave as expected in a 24-hour cycle. But over the 30-hour cycle, they get confused. And when the plants were turned around for 24 hours outdoors and placed indoors under fixed light, they continued to curl from east to west for a few days following the solar cycle. This means that the 24-hour circadian rhythm drives the sunflower's movement.

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