Effect of monochromatic UV-A LED irradiation on the growth of tomato seedlings

Khoshimkhujaev, Bekhzod; Kwon, Jong-Hee; Park, Kyoung Sub; Choi, Hyo-Won; Lee, Sun Yi

doi:10.1007/s13580-014-0021-x

Cited by 19 publications

(12 citation statements)

References 18 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In this study, LED light with a 3% UV-A share in the emitted spectrum effectively increased the stem diameter of broccoli compared to light without UV-A, regardless of storage time. Khoshimkhujaev et al [39] indicated that UV-A (376 nm) added to red LEDs significantly improved tomato seedling parameters, including stem diameter that was significantly larger, compared to solely red light. In the 1980s, it was observed that lighting young cabbage plants with UV light inhibited hypocotyl elongation [40], which is a very desirable feature in seedling production (a short and thick stem is preferred).…”

Section: Discussionmentioning

confidence: 99%

Response of Broccoli Transplants to LED Light during Short and Long-Term Storage

et al. 2020

View full text Add to dashboard Cite

In broccoli production a big challenge is preparation of seedlings, which must be delivered during a strictly defined period to vegetable producers that are often in distant places. The goal of the present study was to investigate the response of 5-week old broccoli transplants cv. Parthenon F1 to 2 and 6 weeks of storage at 4 °C under two LED light spectra (L1: 29% red 660 nm + 14% red 630 nm + 42% blue 250 nm + 15% green 520 nm and L2: 38% red 660 nm + 18% red 630 nm +26% blue 450 nm + 15% green 520 nm + 3% UV-A 330 nm; photoperiod 16/8 h day/night and PPFD 30 ± 10 µmol m−2 s−1) and darkness. Control 5-week-old seedlings were not stored. Light treatment improved the morphology and physiological parameters of seedlings. The yield of broccoli from control seedlings was similar to that obtained after L2 treatment, regardless of seedling storage duration. The most promising effects were obtained by adding 3% UV-A radiation to the lighting spectrum. The results are applicable to the transport of broccoli transplants to remote locations or storage for several weeks, in cases where it is necessary to delay planting.

show abstract

Section: Discussionmentioning

confidence: 99%

Response of Broccoli Transplants to LED Light during Short and Long-Term Storage

et al. 2020

View full text Add to dashboard Cite

show abstract

“…The rapid development of UV-emitting diodes makes it possible to add single UV-A wavelengths to the light spectrum in CEA lighting, which enables a more accurate assessment of the effect of those single wavelengths. Only few studies have been published on the effects of UV-A on vegetables, and these studies show stimulatory effects of UV-A on the growth of some vegetables (Brazaitytė et al, 2010; Chang and Chang, 2014; Khoshimkhujaev et al, 2014; Brazaitytė et al, 2015; Mickens et al, 2019) but inhibitory (Brazaitytė et al, 2009; Vaštakaitė et al, 2015; Jensen et al, 2018) or no effects on others (Li and Kubota, 2009). Our investigations with a standard visible LED lighting system revealed a positive effect of 390-nm UV-A (for 10 h) and 402-nm UV-A (for 10 and 16 h) on the leaf area of mustard microgreens ( Figure 2 ).…”

Section: Discussionmentioning

confidence: 99%

“…Consequently, the usage of UV wavelengths in CEA is still in its initial stages (Wargent, 2016; Neugart and Schreiner, 2018). Although UV LED lighting is a new technology, research has been conducted on the effects of UV-A LED, as a part of different lighting systems or as a sole source of light, on the growth and metabolism of plants (Li and Kubota, 2009; Samuolienė et al, 2013; Khoshimkhujaev et al, 2014; Brazaitytė et al, 2015; Vaštakaitė et al, 2015; Lee et al, 2014; Brazaitytė et al, 2016; Goto et al, 2016; Rechner et al, 2017; Jensen et al, 2018). Some of these investigations showed that UV-A LED leads to higher total phenolic content, anthocyanin content, ascorbic acid concentration, and antiradical properties in leafy vegetables and herbs (Li and Kubota, 2009; Samuolienė et al, 2013; Brazaitytė et al, 2015; Vaštakaitė et al, 2015; Goto et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Response of Mustard Microgreens to Different Wavelengths and Durations of UV-A LEDs

et al. 2019

View full text Add to dashboard Cite

Ultraviolet A (UV-A) light-emitting diodes (LEDs) could serve as an effective tool for improving the content of health-promoting bioactive compounds in plants in controlled-environment agriculture (CEA) systems. The goal of this study was to investigate the effects of UV-A LEDs at different wavelengths (366, 390, and 402 nm) and durations (10 and 16 h) on the growth and phytochemical contents of mustard microgreens (Brassica juncea L. cv. “Red Lion”), when used as supplemental light to the main LED lighting system (with peak wavelengths of 447, 638, 665, and 731 nm). Plants were grown for 10 days under a total photon flux density (TPFD) of 300 µmol m−2 s−1 and 16-h light/8-h dark period. Different UV-A wavelengths and irradiance durations had varied effects on mustard microgreens. Supplemental UV-A radiation did not affect biomass accumulation; however, the longest UV-A wavelength (402 nm) increased the leaf area of mustard microgreens, regardless of the duration of irradiance. The concentration of the total phenolic content and α-tocopherol mostly increased under 402-nm UV-A, while that of nitrates increased under 366- and 390-nm UV-A at both radiance durations. The contents of lutein/zeaxanthin and β-carotene increased in response to the shortest UV-A wavelength (366 nm) at 10-h irradiance as well as longer UV-A wavelength (390 nm) at 16 h irradiance. The most positive effect on the accumulation of mineral elements, except iron, was observed under longer UV-A wavelengths at 16-h irradiance. Overall, these results suggest that properly composed UV-A LED parameters in LED lighting systems could improve the nutritional quality of mustard microgreens, without causing any adverse effects on plant growth.

show abstract

“…320-400 nm 파장 영역을 갖는 UV-A은 식물의 생리적, 생화학적, 유전적 특성을 변화시킬 수 있어 식물 생장과 발달 을 제한하는 물리적 스트레스 요인 중 하나이다 [8,9]. 식물은 UV-A와 같은 광 스트레스로부터 스스로 보호하고 방어하기 위해 플라보노이드, 안토시아닌, 카로티노이드와 같은 2차 대 사산물의 생합성을 촉진한다 [4,10].…”

Section: Research Articleunclassified

“…따라서, 높은 항산화능력을 보유한 식물은 불량한 환경스트레스에 대한 저 항성이 높다. 식물 생장에 해를 주지 않는 에너지 수준의 UV-A 조사는 식물의 환경 저항성을 증대시킬 수 있는 재배 기술로 활용될 수 있고, 식물의 파이토케미컬을 증대시키기 위한 UV-A와 관련된 많은 연구들이 진행되고 있다 [8,9,[13][14][15][16]. 실제로 UV-A 조사는 식물 세포벽 강화와 관련된 페 놀화합물, 프롤린, 수베린, 리그닌을 증가시키며 이러한 화합 물들은 저온 스트레스에 대한 내성을 증대시킨다고 보고되었 다 [14,17,18].…”

Section: Research Articleunclassified

Elicitation of Chilling Tolerance of Pepper Seedlings Using UV-A LED

Park¹

2020

Korean Journal of Environmental Agriculture

View full text Add to dashboard Cite

BACKGROUND: After transplanting, the recent abnormal low temperature caused physiological disorders of pepper seedlings. This study was conducted to evaluate the effects of UV-A LED, a physical elicitor, on the chilling tolerance of pepper seedlings. METHODS AND RESULTS: Seedlings were continuously irradiated with 370 and 385 nm UV-A LEDs with 30 W•m-2 for 6 d. After that, seedlings were exposed to 4°C for 6 h and then recovered under the normal growing condition for 2 d. There were no significant differences in growth characteristics of UV-A treatments compared to the control. Fv/Fm values of two UV-A treatments were below 0.8. Electrolyte leakage in the control was increased by chilling stress, while 385 nm UV-A had the significantly lowest value. Total phenolic content and antioxidant capacity of two UV-A treatments significantly increased due to UV-A radiation. However, total phenolic content and antioxidant capacity of the control increased due to chilling stress and tended to decrease again during the recovery time. CONCLUSION: We confirmed that UV-A light was effective to induce the chilling tolerance of pepper seedling, and the supplemental radiation of 385 nm UV-A LED before transplanting could be used as a cultivation technique to produce high quality pepper seedlings.

show abstract

Effect of monochromatic UV-A LED irradiation on the growth of tomato seedlings

Cited by 19 publications

References 18 publications

Response of Broccoli Transplants to LED Light during Short and Long-Term Storage

Response of Broccoli Transplants to LED Light during Short and Long-Term Storage

Response of Mustard Microgreens to Different Wavelengths and Durations of UV-A LEDs

Elicitation of Chilling Tolerance of Pepper Seedlings Using UV-A LED

Contact Info

Product

Resources

About