Hormone auxin helps plants to grow towards light
An international team of scientists has proved for the first time that plant hormone auxin definitely is the substance that drives the plants to grow toward the sunlight to be able to generate energy by photosynthesis.
The growth of plants toward light is particularly important at the beginning of their lifecycle. Many seeds germinate in the soil and get their nutrition in the dark from their limited reserves of starch and lipids. Reaching for the surface, the seedlings rapidly grow upwards against the gravitational pull, which provides an initial clue for orientation.