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ISHS Acta Horticulturae 1170: International Symposium on New Technologies and Management for Greenhouses - GreenSys2015

Light spectral effects on phenolic compounds in Perilla frutescens leaves as related to the leaf age, color and duration of exposure

Authors:   A. Viršilė, A. Brazaitytė, R. Sirtautas, P. Duchovskis
Keywords:   light quality, flavonoids, DPPH, red and green perilla, young and mature leaves
DOI:   10.17660/ActaHortic.2017.1170.126
We aimed to evaluate the effects of light spectral components on the phenolic compounds in young and mature green and red perilla leaves seeking to raise plants with increased antioxidant and nutritional value. Plants were cultivated in phytotron (21/17░C) under experimental light emitting diode (LED) based lighting (18 h, 300 Ámol m-2 s-1) the whole 30 days growth cycle (long-term exposure) or transferred from high pressure sodium lighting to experimental LED lighting for the last 3 days of experiment (short-term exposure). Experimental lighting spectra consisted of sole red 638 or 665 nm LED light (300 Ámol m-2 s-1) or the combination of red 665 nm with 50 Ámol m-2 s-1 of blue 455, yellow 595, green 520 nm or 15 Ámol m-2 s-1 of UV-A 385 nm light (total PPFD of 300 Ámol m-2 s-1 maintained). Sole red light promoted accumulation of phenolic compounds in young red and green perilla leaves both after short-term and long-term exposure, when supplemental blue light had significant effect only in mature leaves. In young green perilla leaves higher contents of phenolic compounds were determined after short-term UV-A exposure. The higher contents of phenolic compounds under different light spectra exposure correlates with higher 2,2-diphenyl-1-picrylhydrazyl (DPPH) free radical scavenging activity after long-term exposure in green perilla and both after long and short-term exposure in red perilla leaves.

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