Effects of Far-Red Light on Plants

                   Author:  Amaris Luo         E: [email protected]        Wechat &Whatsapp: 86 13667831599

With people's more and more in-depth research on the spectrum, from simple white light, red light to UV, the pursuit of far red. When we want to know the effect of far-red light on short-day plants, we should learn what far-red is.

What is far red?

Plant photosynthesis absorption spectrum is mainly in the blue light of the 450nm band and the red light of the 660nm band. However, there is an EMERSON effect that proves that under the red light of about 735nm wavelength, the quantum efficiency of the photosynthesis is higher than that of this part of light.Usually regarded as the region between 700 and 750 nm wavelength, it is dimly visible to human eyes.

1. Shade avoidance

Effect of 730nm far-red light is shade avoidance.If the plant is only irradiated by the deep red light of 660nm, the plant will feel that it is under direct sunlight and grow normally. If the plant is mainly irradiated by the far-red light of 730nm, the plant will feel as if the direct light of the sun is blocked by another taller plant, so the plant will grow harder to break through the blocking, that is, there is helps plants grow taller, but doesn't necessarily mean more biomass.

2. The flowering induction effect of 730nm far-red light

Another important role of 730nm far-red light in horticultural lighting applications is that it has great value for ornamental flowers, and the flowering cycle can be controlled by 660nm and 730nm light.The conversion of the phytochrome Pr to Pfr is mainly induced by deep red light at 660 nm (representing sunlight during the day), while the conversion of Pfr to Pr usually occurs naturally at night, and can also be excited by irradiation with far-red light at 730 nm.

It is generally believed that the control of plant flowering by phytochromes mainly depends on the ratio of Pfr/Pr, so we can control the Pfr/Pr value by irradiating far-red light at 730 nm, thereby controlling the flowering cycle more accurately.

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