Far-red LEDs improve fruit production in greenhouse tomato grown under high-pressure sodium lighting

Hao, Xiying; Little, C.; Zheng, Jingming; Cao, Ruge

doi:10.17660/actahortic.2016.1134.13

Cited by 26 publications

(33 citation statements)

References 7 publications

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“…Conversely, the addition of FR to R can reduce the antioxidant synthesis in some species: for instance, in lettuce an increase in plant biomass was associated to a lower anthocyanin content (Li and Kubota 2009; Table 1). Conversely, in tomato increasing FR LED light, added to natural light supplemented with HPS, positively affected the stem length and fruit yield in the first month of the trial, as well as carotenoid content during the whole experiment (Hao et al 2016).…”

Section: Vegetable Cropsmentioning

confidence: 87%

“…length of internodes and leaf insertion angle) with consequent reduction of leaves self-shading, which has a relevant impact on light penetration and light use efficiency (Sarlikioti et al 2011). Later, other experiments on cucumber highlighted that the addition of LED R light as interlighting to assimilation HPS light and natural light, in order to raise the R:FR ratio, did not increase fruit yield while promoted Chl synthesis, with consequent increase in fruit colour and improvement of visual appearance (Hao et al 2016; Table 2).…”

Section: Vegetable Cropsmentioning

confidence: 99%

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Light-Quality Manipulation to Control Plant Growth and Photomorphogenesis in Greenhouse Horticulture: The State of the Art and the Opportunities of Modern LED Systems

Paradiso

Proietti

2021

J Plant Growth Regul

251

121

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Light quantity (intensity and photoperiod) and quality (spectral composition) affect plant growth and physiology and interact with other environmental parameters and cultivation factors in determining the plant behaviour. More than providing the energy for photosynthesis, light also dictates specific signals which regulate plant development, shaping and metabolism, in the complex phenomenon of photomorphogenesis, driven by light colours. These are perceived even at very low intensity by five classes of specific photoreceptors, which have been characterized in their biochemical features and physiological roles. Knowledge about plant photomorphogenesis increased dramatically during the last years, also thanks the diffusion of light-emitting diodes (LEDs), which offer several advantages compared to the conventional light sources, such as the possibility to tailor the light spectrum and to regulate the light intensity, depending on the specific requirements of the different crops and development stages. This knowledge could be profitably applied in greenhouse horticulture to improve production schedules and crop yield and quality. This article presents a brief overview on the effects of light spectrum of artificial lighting on plant growth and photomorphogenesis in vegetable and ornamental crops, and on the state of the art of the research on LEDs in greenhouse horticulture. Particularly, we analysed these effects by approaching, when possible, each single-light waveband, as most of the review works available in the literature considers the influence of combined spectra.

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Section: Vegetable Cropsmentioning

confidence: 87%

Section: Vegetable Cropsmentioning

confidence: 99%

Light-Quality Manipulation to Control Plant Growth and Photomorphogenesis in Greenhouse Horticulture: The State of the Art and the Opportunities of Modern LED Systems

Paradiso

Proietti

2021

J Plant Growth Regul

251

121

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“…The results showed that the highest studied green percentage (39%), which was similar to the sunlight spectrum, showed the best effects on plant biomass and yield, suggesting that plants may use sunlight-combined wavelengths more efficiently for growth than other wavelength combinations (Kaiser et al, 2019b ). The far-red wavelength was also investigated by several studies on greenhouse tomato supplemental LED lighting (Pepin et al, 2014 ; Hao et al, 2015 , 2016 ; Gómez and Mitchell, 2016b ; Song et al, 2016 ; Dzakovich et al, 2017 ; Fanwoua et al, 2019 ; Ji et al, 2019 ; Kalaitzoglou et al, 2019 ; Kim et al, 2019 , 2020 ; Zhang et al, 2019 ). The far-red ratio, particularly the red:far-red ratio, influences phytochrome regulation and has effects on plant architectural development, flower induction, germination, photosynthetic capacity, and nutrition (Demotes-Mainard et al, 2016 ).…”

Section: Discussionmentioning

confidence: 99%

“…In this context, several studies have already reported the usefulness of LED lighting system applications for qualitative and quantitative improvements in greenhouse truss tomato production (Tewolde et al, 2016 ; Dzakovich et al, 2017 ; Jiang et al, 2017 ; Kim et al, 2019 ). However, inconsistencies among studies are also present; non-significant effects of supplemental LED lighting, especially on qualitative parameters (e.g., soluble solids, ascorbic acid) (Lu et al, 2012b ; Hao et al, 2016 ), have been found. In most studies to date, researchers have integrated supplemental LED lighting technologies either in greenhouses where no supplemental lighting was formerly present or as additional lighting sources in greenhouses where top artificial lights (e.g., high-pressure sodium lights, HPSs, lamps) were already installed and in operation.…”

Section: Introductionmentioning

confidence: 99%

Supplemental LED Lighting Effectively Enhances the Yield and Quality of Greenhouse Truss Tomato Production: Results of a Meta-Analysis

et al. 2021

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Intensive growing systems used for greenhouse tomato production, together with light interception by cladding materials or other devices, may induce intracanopy mutual shading and create suboptimal environmental conditions for plant growth. There are a large number of published peer-reviewed studies assessing the effects of supplemental light-emitting diode (LED) lighting on improving light distribution in plant canopies, increasing crop yields and producing qualitative traits. However, the research results are often contradictory, as the lighting parameters (e.g., photoperiod, intensity, and quality) and environmental conditions vary among conducted experiments. This research presents a global overview of supplemental LED lighting applications for greenhouse tomato production deepened by a meta-analysis aimed at answering the following research question: does supplemental LED lighting enhance the yield and qualitative traits of greenhouse truss tomato production? The meta-analysis was based on the differences among independent groups by comparing a control value (featuring either background solar light or solar + HPS light) with a treatment value (solar + supplemental LED light or solar + HPS + supplemental LED light, respectively) and included 31 published papers and 100 total observations. The meta-analysis results revealed the statistically significant positive effects (p-value < 0.001) of supplemental LED lighting on enhancing the yield (+40%), soluble solid (+6%) and ascorbic acid (+11%) contents, leaf chlorophyll content (+31%), photosynthetic capacity (+50%), and leaf area (+9%) compared to the control conditions. In contrast, supplemental LED lighting did not show a statistically significant effect on the leaf stomatal conductance (p-value = 0.171). In conclusion, in addition to some partial inconsistencies among the considered studies, the present research enables us to assert that supplemental LED lighting ameliorates the quantitative and qualitative aspects of greenhouse tomato production.

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“…This finding is consistent with some study that confirmed FR (700-800 nm) has a major effect on the extension growth and length of stem (Park and Runkle, 2017) by adding FR to R and B at the end of day 30 min or enriched spectrum. Lastly, FR adding in HPS lamp could increase stem length in the early growth of tomato (Hao et al, 2016). R:B.3.5+FR50 increased the stem diameter of the holy basil by 25% of R:B.3.5 and 20% of R:B.7.…”

Section: Holy Basilmentioning

confidence: 96%

Increasing Growth and Yield of Sweet Basil and Holy Basil by Application of Far-Red Radiation for Indoor Horticulture

Watjanatepin¹,

Sritanauthaikorn²

2020

J. Eng. Appl. Sci.

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The objective of this study is to investigate the interaction of R, B and FR from phosphor-converted LED on the growth and yield of the sweet basil and holy basil. Seedlings were grown in the chamber with a continuous supply of 200 µmolm-2 sec-1 PPFD of R and B. Several ratios were applied as R:B.3.5 and 7.0 without FR and R:B.3.5 with FR 50 µmolm-2 sec-1. The photo period was 16/8 h. The results found that R:B.3.5 with FR50 significantly increased the growth rate by 49-114%, the plant height by 64-137%, the stem diameter by 20-25% and the total fresh weight by 98-181% of the crops. R:B.3.5 with FR50 also significantly increased the average leaf area by 59-85% for the holy basil but not in the sweet basil and increased the total dry weight by 110-253% of the sweet basil but not in the holy basil. Additionally, no effects on the leaf thickness of the crops were observed. R:B.7 without FR had the trend to promote the growth of leaf and stem and total fresh weight of the crops than R:B.3.5 without FR. Moreover, the combination of FR with the R and B light could increase the leaf expansion, stem length whole plant photosynthesis and total fresh and dry weight of the sweet basil and holy basil.

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Far-red LEDs improve fruit production in greenhouse tomato grown under high-pressure sodium lighting

Cited by 26 publications

References 7 publications

Light-Quality Manipulation to Control Plant Growth and Photomorphogenesis in Greenhouse Horticulture: The State of the Art and the Opportunities of Modern LED Systems

Light-Quality Manipulation to Control Plant Growth and Photomorphogenesis in Greenhouse Horticulture: The State of the Art and the Opportunities of Modern LED Systems

Supplemental LED Lighting Effectively Enhances the Yield and Quality of Greenhouse Truss Tomato Production: Results of a Meta-Analysis

Increasing Growth and Yield of Sweet Basil and Holy Basil by Application of Far-Red Radiation for Indoor Horticulture

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