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Photoreceptors and Plant Responses to Light02:00

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Light plays a significant role in regulating the growth and development of plants. In addition to providing energy for photosynthesis, light provides other important cues to regulate a range of developmental and physiological responses in plants.
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The energy required to carry out photosynthesis is light— typically electromagnetic radiation from the sun. The range of all possible wavelengths is known as the electromagnetic spectrum.
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In order to produce glucose, plants need to capture sufficient light energy. Many modern plants have evolved leaves specialized for light acquisition. Leaves can be only millimeters in width or tens of meters wide, depending on the environment. Due to competition for sunlight, evolution has driven the evolution of increasingly larger leaves and taller plants, to avoid shading by their neighbors with contaminant elaboration of root architecture and mechanisms to transport water and nutrients.
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The circadian—or biological—clock is an intrinsic, timekeeping, molecular mechanism that allows plants to coordinate physiological activities over 24-hour cycles called circadian rhythms. Photoperiodism is a collective term for the biological responses of plants to variations in the relative lengths of dark and light periods. The period of light-exposure is called the photoperiod.
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Updated: Jan 2, 2026

Analysis of Arabidopsis thaliana Growth Behavior in Different Light Qualities
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Light Me up? Why, When, and How Much Light We Need

Céline Vetter1, Andrew J K Phillips2, Ana Silva3

  • 1Department of Integrative Physiology, University of Colorado, Boulder, Colorado, USA.

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|December 10, 2019
PubMed
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No abstract available in PubMed .

Keywords:
entrainmentjetlaglight at nightmelatoninretinal ganglion cells

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