Duration of light-emitting diode (LED) supplemental lighting providing far-red radiation during seedling production influences subsequent time to flower of long-day annuals

Kohler, Annika E.; López, Roberto G.

doi:10.1016/j.scienta.2021.109956

Cited by 14 publications

(7 citation statements)

References 34 publications

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“…The wavelengths from (400-700 nm), termed photosynthetically active radiation (PAR), are the most relevant for plant growth and are measured in PPFD, photosynthetic photon flux density. TPFD, or total photon flux density, is also used to account for the full range of wavelengths sensed by plants (Kim et al, 2019;Zhen and Bugbee, 2020;Kohler and Lopez, 2021).…”

Section: Introductionmentioning

confidence: 99%

Emergent molecular traits of lettuce and tomato grown under wavelength-selective solar cells

Charles

Edwards²,

Ravishankar³

et al. 2023

Front. Plant Sci.

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The integration of semi-transparent organic solar cells (ST-OSCs) in greenhouses offers new agrivoltaic opportunities to meet the growing demands for sustainable food production. The tailored absorption/transmission spectra of ST-OSCs impacts the power generated as well as crop growth, development and responses to the biotic and abiotic environments. To characterize crop responses to ST-OSCs, we grew lettuce and tomato, traditional greenhouse crops, under three ST-OSC filters that create different light spectra. Lettuce yield and early tomato development are not negatively affected by the modified light environment. Our genomic analysis reveals that lettuce production exhibits beneficial traits involving nutrient content and nitrogen utilization while select ST-OSCs impact regulation of flowering initiation in tomato. These results suggest that ST-OSCs integrated into greenhouses are not only a promising technology for energy-neutral, sustainable and climate-change protected crop production, but can deliver benefits beyond energy considerations.

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Section: Introductionmentioning

confidence: 99%

Emergent molecular traits of lettuce and tomato grown under wavelength-selective solar cells

Charles

Edwards²,

Ravishankar³

et al. 2023

Front. Plant Sci.

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“…Our research group has measured the spectral response of saffron leaves before, but some data results are not ideal due to the poor stability and significant attenuation of short arc xenon lamps (Ji et al 2021). LEDs have gained popularity for horticultural applications due to narrow spectrum, cold light source and long lifespan (Kohler & Lopez 2021). The narrowband LEDs at 400−700 nm was used to investigate the photosynthetic spectral dependance for horticultural crops by Lee et al (2017), but non-uniform wavelength interval may result in missing key wavelengths during measurements.…”

Section: Introductionmentioning

confidence: 99%

Study on spectral response of saffron (Crocus sativus L.) at different leaf ages and evaluation on photosynthetic energy efficiency of narrow-band LED spotlights

Gao,

Yuan,

Pei

et al. 2023

Preprint

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Leaf photosynthesis largely determines the daughter corm yields in vegetative growth for saffron (Crocus sativus L.). Most of previous researches focuses on spectral response in various species, but lacking the study on saffron leaves at different leaf ages. In this study, the action spectrum based on photosynthetic photon flux density (PPFD) and irradiance were distinguished and interpretated. The optical properties and photosynthetic performances of leaves were respectively investigated at two leaf ages, dependence on customized narrow-band LED spotlights from 380 nm to 780 nm with an interval 20 nm and a band width 10 nm. The younger leaves charactered higher reflectance and transmittance at 500 − 600 nm, resulting in lower absorptance compared to the older leaves. The spectral response curves including action spectrum and quantum yield for younger leaves were higher than the older, but their relative curves displayed coincidence. The spectral response curves exhibited two peaks at 440 and 640 nm, but not low between 500 and 600 nm. Nevertheless, the photosynthetic energy efficiency of spotlights demonstrated very low in green/yellow region. Accordingly, more attentions should be paid to green and yellow LED lighting during the vegetative stage for saffron, as well as improving their manufacturing technology.

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“…Scientists studied the effect of light intensity, light spectrum and wavelength of LEDs on the quality of vegetable crops, in particular, broccoli, carrots, microgreens (microgreens) [4,8,9,20].…”

Section: Introductionmentioning

confidence: 99%

Application of ESCO phytosystem based on narrow-band light-emitting diodes for growing cucumbers under photoculture conditions

2022

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The article deals with the study of photomorphogenesis of different cucumber varieties under light culture conditions. Studies were carried out under laboratory conditions using an experimental phytosystem ESCO based on narrow-band light-emitting diodes, which is equipped with a microcontroller. The microcontroller controls the supplementary light modes. Studies were conducted to develop recommendations for selecting and controlling the spectral composition of light optimal for the life cycle of plants. The aim of our research is to study photomorphogenesis of different cucumber varieties under light-culture conditions using an experimental ESCO phytosystem based on narrow-band light-emitting diodes equipped with a microcontroller that controls the supplementary light modes. Four cucumber hybrids were used to test the ESCO phytosystem. Phytolamps were placed at the height of 1 m in the beginning, then at the height of 1.2 m. Every day we recorded the growth of shoot length, establishment of generative organs (flowers), we recorded the date of flowering and fruit formation. Conditions of humidity, nutrient and air regimes corresponded to biological requirements of growth and development of cucumber plants. Studies have shown that laying of generative organs of cucumber with additional lighting with narrow-band light emitting diodes is good. Female flowers appeared 7-14 days earlier in BV700+RV350+ BF350+FRF350 regime than in plants grown under natural light. The RV light regime had a significant effect on the increase in plant height. Determination of chlorophyll content showed its optimal amount and depended on the varietal characteristics of plants. The best supplementary light mode was BV700+RV350+ BF350+FRF350 during the cultivation of seedlings of different cucumber hybrids. Mode change all to 500 after planting in the ground.

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Duration of light-emitting diode (LED) supplemental lighting providing far-red radiation during seedling production influences subsequent time to flower of long-day annuals

Cited by 14 publications

References 34 publications

Emergent molecular traits of lettuce and tomato grown under wavelength-selective solar cells

Emergent molecular traits of lettuce and tomato grown under wavelength-selective solar cells

Study on spectral response of saffron (Crocus sativus L.) at different leaf ages and evaluation on photosynthetic energy efficiency of narrow-band LED spotlights

Application of ESCO phytosystem based on narrow-band light-emitting diodes for growing cucumbers under photoculture conditions

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