Page 61 - Abstract book - TJSSF-2020

Thailand – Japan Student Science Fair 2020 (TJ-SSF 2020)
“Seeding Innovations through Fostering Thailand – Japan Youth Friendship”

The Effects of Blue Light and UV-A Give Plants

Iori Oie , Inori Oie
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Advisor: Yoriko Ikuta
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Nara Prefectural Seisho Junior and Senior High School
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Abstract
According to previous research, irradiation of plants with UV-B or UV-A cause’s growth inhibition.
Specifically, previous studies made use of radish sprouts which were irradiated with Blue and UV-A
light, had significantly longer stems and larger amounts of polyphenol than radish sprouts which were
irradiated with Blue light alone. In addition, researchers were able to confirm the presence of a
polyphenol which absorbed the UV wavelength. We hypothesized that anthocyanin was generated as a
defensive substance when irradiation with Blue Light and UV-A occurred, and that stomatal opening is
promoted by Blue light. In conclusion, this study confirms the existence of a substance which absorbs
short wavelengths when irradiated with Blue or Blue and UV-A light. Finally, it was shown that there
was no substance generated when irradiated with Blue and UV-A light. Furthermore, the current study
illustrated that it is not possible to use a spectrophotometer to distinguish between light absorbing
substances in radish sprouts using a spectrophotometer.

Keywords: irradiation of plants, UV-B or UV-A, Blue light, a spectrophotometer, radish sprouts

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