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What is the role of light in plant growth?

Light is the energy source of photosynthesis, plants through photosynthesis to convert solar energy into other forms of life in the biosphere can use energy, light energy utilization in plant photosynthesis for terrestrial higher plants mainly concentrated in the red and blue area, aquatic plants in the submerged plant is mainly the use of shorter wavelength light, such as ocean algae you can use green.

Only visible light can be used for photosynthesis. Solar radiation can be used as physiological photosynthesis effective radiation (physiologically radiation, active) in physiological ecology on understanding photosynthetic effective radiation, the order of effectiveness of each spectrum for blue violet red orange light > > > yellow light green. Green in the terrestrial plant photosynthesis is rarely used, called physiological radiation (physiologically non-activeradiation) invalid.

The process by which plants depend on light for growth, development, and differentiation. Photosynthesis is a high energy reaction (requires a strong light), which converts light energy into chemical energy. Light is a low energy response (not too Qiang Guangzhao), light as a signal to stimulate the receptor, promote a series of reactions in the cell, the final performance of the morphological changes. The total energy of the red light required for the establishment of the light and the light compensation point (the light intensity of the plant and the intensity of illumination at the same time) reached 10 orders of magnitude. The red light and far red light can determine the change of the formation of the light, the light body is phytochrome, and then control the plant seed germination, tissue and organ differentiation, improve the growth rate.


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