Supplemental blue light increases growth and quality of greenhouse pak choi depending on cultivar and supplemental light intensity

Zheng, Yinjian; Zhang, Yi-ting; Liu, Houcheng; Li, Yamin; Liu, Yingliang; Hao, Yanwei; Lei, Bingfu

doi:10.1016/s2095-3119(18)62064-7

Cited by 63 publications

(45 citation statements)

References 45 publications

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“…A recent study reported a reduction in DPPH antioxidant activity in PC under different pulsed-LED frequencies of yellow (590 nm) LEDs (Vastakaite et al, 2017). Another study found that increasing blue light intensity significantly enhanced DPPH antioxidant activity in two pac choi cultivars (Zheng et al, 2018). Only under a ratio of 18.45A:33.51B:47.48R did we find a significant increase in DPPH antioxidant activity from control in PC microgreens (Table 3).…”

Section: Dpphmentioning

confidence: 61%

Amber, red and blue LEDs modulate phenolic contents and antioxidant activities in eight Cruciferous microgreens

Alrifai¹,

Hao²,

Liu³

et al. 2020

JFB

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LEDs are applied in controlled environments to produce high-quality microgreens of various nutritional benefit. We investigate different ratios of amber, blue and red LEDs on the synthesis of antioxidant phytochemicals in 8 species of the Brassica genus of microgreens. Microgreens were grown under 8 different LED ratios using combined amber, blue and red ranging from 4.73–58.94%, 20.52–58.94% and 74.36–0.57%, respectively. Results indicated that the effect of the combined lighting on antioxidant activity, total phenolic contents (TPC) accumulation, or its sub-groups total flavonoid contents (TFC) and total anthocyanin contents (TAC), were species-dependent. With increasing amber and blue and concurrently decreasing red lighting, overall positive correlations were observed for TPC, TFC and antioxidant activities (DPPH and FRAP), and overall negative correlations for TAC and ORAC (p < 0.05). Current findings suggest the microgreens can be clustered into 3 groups based on phytochemical contents and sensitivity to the lighting: (i) high blue and amber dose-dependence producing high total phenolics and flavonoids content and DPPH antioxidant activity in radish, red Rambo microgreens; (ii) moderate to high sensitivity to overall lighting but no clear dose-dependence to the light in mustards Barbarossa and red kingdom; and (iii) mizunas, pac choi and other microgreens with various responses to lighting.

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Section: Dpphmentioning

confidence: 61%

Amber, red and blue LEDs modulate phenolic contents and antioxidant activities in eight Cruciferous microgreens

Alrifai¹,

Hao²,

Liu³

et al. 2020

JFB

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“…The light environment could affect GLs in brassica species. Higher percentages of blue wavelengths led to a pronounced enhancement of glucosinolate contents in pakchoi [ 53 ]. The accumulation of glucosinolates in Chinese kale sprouts shoots significantly inhibited by 30 μmol m −2 s −1 B LED (470 nm) compared with the darkness control, white LED light and R LED light treatments, while there was no obvious effect on those of the roots [ 54 ].…”

Section: Discussionmentioning

confidence: 99%

The Combination of Selenium and LED Light Quality Affects Growth and Nutritional Properties of Broccoli Sprouts

Gao

Shi

et al. 2020

Molecules

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Selenium (Se) supplement was combined with different LED light qualities to investigate mutual effects on the growth, nutritional quality, contents of glucosinolates and mineral elements in broccoli sprouts. There were five treatments: CK:1R1B1G, 1R1B1G+Se (100 μmol L−1 Na2SeO3), 1R1B+Se, 1R2B+Se, 2R1B+Se, 60 μmol m−2 s−1 PPFD, 12 h/12 h (light/dark). Sprouts under a combination of selenium and LED light quality treatment exhibited no remarkable change fresh weight, but had a shorter hypocotyl length, lower moisture content and heavier dry weight, especially with 1R2B+Se treatment. The contents of carotenoid, soluble protein, soluble sugar, vitamin C, total flavonoids, total polyphenol and contents of total glucosinolates and organic Se were dramatically improved through the combination of Se and LED light quality. Moreover, heat map and principal component analysis showed that broccoli sprouts under 1R2B+Se treatment had higher nutritional quality and health-promoting compound contents than other treatments. This suggests that the Se supplement under suitable LED lights might be beneficial to selenium-biofortified broccoli sprout production.

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“…butterhead) leaves significantly decreased when the light intensity of red and blue LED light (red:blue = 4:1) increased from 60 to 210 μmol m −2 s −1 [ 37 ]. Before harvest, supplemental blue LED light increased the growth and nutrients of pak choi ( Brassica rapa ) grown in the greenhouse, while the nitrate concentration decreased as the blue light intensity increased from 0 to 150 μmol m −2 s −1 [ 38 ]. Samuolienė et al [ 39 ] used mixed LEDs (those emitting at 455, 638, 665 and 731 nm) with different light intensities to treat Brassica microgreens.…”

Section: Nitrate Assimilation and Accumulation In Vegetables In Rementioning

confidence: 99%

A Review of Environment Effects on Nitrate Accumulation in Leafy Vegetables Grown in Controlled Environments

Bian

Wang

Zhang

et al. 2020

Foods

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Excessive accumulation of nitrates in vegetables is a common issue that poses a potential threat to human health. The absorption, translocation, and assimilation of nitrates in vegetables are tightly regulated by the interaction of internal cues (expression of related genes and enzyme activities) and external environmental factors. In addition to global food security, food nutritional quality is recognized as being of strategic importance by most governments and other agencies. Therefore, the identification and development of sustainable, innovative, and inexpensive approaches for increasing vegetable production and concomitantly reducing nitrate concentration are extremely important. Under controlled environmental conditions, optimal fertilizer/nutrient element management and environmental regulation play vital roles in producing vegetables with low nitrate content. In this review, we present some of the recent findings concerning the effects of environmental factors (e.g., light, temperature, and CO2) and fertilizer/nutrient solution management strategies on nitrate reduction in vegetables grown under controlled environments and discuss the possible molecular mechanisms. We also highlight several perspectives for future research to optimize the yield and nutrition quality of leafy vegetables grown in controlled environments.

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Supplemental blue light increases growth and quality of greenhouse pak choi depending on cultivar and supplemental light intensity

Cited by 63 publications

References 45 publications

Amber, red and blue LEDs modulate phenolic contents and antioxidant activities in eight Cruciferous microgreens

Amber, red and blue LEDs modulate phenolic contents and antioxidant activities in eight Cruciferous microgreens

The Combination of Selenium and LED Light Quality Affects Growth and Nutritional Properties of Broccoli Sprouts

A Review of Environment Effects on Nitrate Accumulation in Leafy Vegetables Grown in Controlled Environments

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