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Your position:Home > News > Industry News > The study reveals how the root.....

The study reveals how the roots of plants perceive light

  • Author:Eunice
  • Source:net
  • Release on :2017-04-25
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    A recent study published in the journal Science-Signal shows that plants seem to deliver sunlight directly to the underground roots to help them grow.
     It is well known that the light receptors in the stem, leaves and flowers can regulate plant growth. Although the roots also have these receptors, it is not clear how they perceive the light in the dark soil.
    Hyo-Jun Lee and colleagues from the National University of Seoul, Korea, studied the phenomenon using a small flowering plant, Arabidopsis from cruciferous, as a model. They found that the stem of Arabidopsis would act like a fiber optic cable and transmit light down to the root receptor known as the photosensitive pigment. This triggers a protein called HY5, which promotes healthy growth of the roots.

     When these plants were transformed into light-sensitive mutations, HY5 production began to decline. And when they have HY5 mutations, their roots are hampered and the angle of stretching is very weird.
     To confirm that the light was transmitted directly in the plant rather than the activation of the signal to the roots of the signal chemical substances, the researchers through the fiber to connect a light source to the plant stem. The ground detector at the end of the root confirms that the light is transmitted directly there.
    More importantly, when they were treated with common plant signal chemicals such as sucrose in the dark Arabidopsis samples, no significant signs of rapid growth in root growth were observed. This suggests that such chemicals do not drive growth.
    The study also found that red light in the plant the highest efficiency of movement. Lee said that the long wavelengths of such rays may be advantageous because they can travel fartherly than the shorter blue and green wavelengths. He also said that most plants have light-sensitive pigments, and this suggests that direct transport of light through the stem to the roots is a common mechanism used to optimize root growth.

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