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The optical effect of a semiconductor laser on protecting wheat from UV-B radiation damage

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Abstract

Lasers have been widely used in the field of biology along with the development of laser technology, but the mechanism of the bio-effect of lasers is not explicit. The objective of this paper was to test the optical effect of a laser on protecting wheat from UV-B damage. A patent instrument was employed to emit semiconductor laser (wavelength 650 nm) and incoherent red light, which was transformed from the semiconductor laser. The wavelength, power and lightfleck diameter of the incoherent red light are the same as those of the semiconductor laser. The semiconductor laser (wavelength 650 nm, power density 3.97 mW mm−2) and incoherent red light (wavelength 650 nm, power density 3.97 mW mm−2) directly irradiated the embryo of wheat seeds for 3 min respectively, and when the seedlings were 12-day-old they were irradiated by UV-B radiation (10.08 kJ m−2) for 12 h in the dark. Changes in the concentration of malondialdehyde (MDA), hydrogen peroxide (H2O2), glutathione (GSH), ascorbate (AsA), carotenoids (CAR), the production rate of superoxide radical (O2−), the activities of peroxidase (POD), catalase (CAT), superoxide dismutase (SOD) and the growth parameters of seedlings (plant height, leaf area and fresh weight) were measured to test the optical effect of the laser. The results showed that the incoherent red light treatment could not enhance the activities of SOD, POD and CAT and the concentration of AsA and CAR. When the plant cells were irradiated by UV-B, the incoherent red light treatment could not eliminate active oxygen and prevent lipid peroxidation in wheat. The results also clearly demonstrate that the plant DNA was damaged by UV-B radiation and semiconductor laser irradiance had the capability to protect plants from UV-B-induced DNA damage, while the incoherent red light could not. This is the first investigation reporting the optical effect of a semiconductor laser on protecting wheat from UV-B radiation damage.

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Authors and Affiliations

  1. College of Life Science, Northwest University, 229 North Taibai Road, Xi’an, 710069, P. R. China

    Zong-Bo Qiu, Xin-Jun Zhu, Fang-Min Li, Xiao Liu & Ming Yue

  2. College of Life Science, Henan Normal University, Xinxiang, 453007, P. R. China

    Zong-Bo Qiu

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Correspondence to Ming Yue.

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Qiu, ZB., Zhu, XJ., Li, FM. et al. The optical effect of a semiconductor laser on protecting wheat from UV-B radiation damage. Photochem Photobiol Sci 6, 788–793 (2007). https://doi.org/10.1039/b618131g

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