Bichromatic red and blue LEDs during healing enhance the vegetative growth and quality of grafted watermelon seedlings

Bantis, Filippos; Κουκουνάρας, Αθανάσιος; Siomos, Anastasios S.; Fotelli, Mariangela N.; Kintzonidis, Damianos

doi:10.1016/j.scienta.2019.109000

Cited by 28 publications

(22 citation statements)

References 44 publications

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“…The photoperiod was set at 16 h and photosynthetic photon flux density (PPFD) was maintained at 85 ± 5 µmol m −2 s −1 emitted by two lamps per light treatment. In a recent study, the above-mentioned PPFD proved beneficial for the growth of watermelon and interspecific squash seedlings before grafting [26]. Each species was tested independently in two separate experiments which were performed twice.…”

Section: Growth Chamber and Light Conditionsmentioning

confidence: 99%

Optimal LED Wavelength Composition for the Production of High-Quality Watermelon and Interspecific Squash Seedlings Used for Grafting

et al. 2019

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Watermelon is cultivated worldwide and is mainly grafted onto interspecific squash rootstocks. Light-emitting diodes (LEDs) can be implemented as light sources during indoor production of both species and their spectral quality is of great importance. The objective of the present study was to determine the optimal emission of LEDs with wide wavelength for the production of watermelon and interspecific squash seedlings in a growth chamber. Conditions were set at 22/20 °C temperature (day/night), 16 h photoperiod, and 85 ± 5 μmol m−2 s−1 photosynthetic photon flux density. Illumination was provided by fluorescent (FL, T0) lamps or four LEDs (T1, T2, T3, and T4) emitting varying wide spectra. Watermelon seedlings had greater shoot length, stem diameter, cotyledon area, shoot dry weight-to-length (DW/L) ratio, and Dickson’s quality index (DQI) under T1 and T3, while leaf area and shoot dry weight (DW) had higher values under T1. Interspecific squash seedlings had greater stem diameter, and shoot and root DW under T1 and T3, while leaf and cotyledon areas were favored under T1. In both species, T0 showed inferior development. It could be concluded that a light source with high red emission, relatively low blue emission, and a red:far-red ratio of about 3 units seems ideal for the production of high-quality watermelon (scion) and interspecific squash (rootstock) seedlings.

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Section: Growth Chamber and Light Conditionsmentioning

confidence: 99%

Optimal LED Wavelength Composition for the Production of High-Quality Watermelon and Interspecific Squash Seedlings Used for Grafting

et al. 2019

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“…Their main light absorption spectral regions coincide with the red and blue wavelengths; thus, photosynthesis is mainly driven by red and blue light [34]. Previous research of our group [10] that focused on Cel × TZ demonstrated that 12B and 24B treatments enhanced several quality features of grafted watermelon seedlings. In the present research, it is shown that 24B is beneficial for the biomass production of three out of four genotype combinations compared to some of the light treatments tested, but 12B leads to inferior shoot biomass in genotype combinations, including Sunny Florida F1 (i.e., Flor × TZ and Flor × Rad), compared to some of the light treatments tested (Figure 3).…”

Section: Resultsmentioning

confidence: 99%

“…Until today, only a few published research articles [ 9 , 10 ] are related to the effects of light spectra on grafted watermelon seedlings. In addition, to our knowledge, there is no information available about the possible scion and rootstock genotype dependency after illumination with different light spectra in any graft-propagated vegetable species (i.e., watermelon, cucumber, tomato, pepper, etc.).…”

Section: Introductionmentioning

confidence: 99%

Influence of Light Spectra from LEDs and Scion × Rootstock Genotype Combinations on the Quality of Grafted Watermelon Seedlings

Bantis

Dangitsis

Κουκουνάρας

2021

Plants

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Grafting is the main means of propagation for watermelon crops. The aim of the present study was to evaluate whether light quality during graft healing variably affects different scion × rootstock genotype combinations. Two watermelon hybrid scions (Sunny Florida F1 and Celine F1) and two interspecific squash rootstocks (Radik and TZ-148) were used, and four scion × rootstock genotype combinations derived. After grafting, we tested seven light-emitting diodes (LEDs), which provided narrow-band red (R) and blue (B); R-B with 36% (36B), 24% (24B), and 12% (12B) blue; 12B with additional far-red (12B+FR); and white (W), in a healing chamber. In three genotype combinations, shoot length, leaf area, and shoot biomass were mainly enhanced under red-blue LEDs, while stem diameter was greater under R. In contrast, dry weight of roots, Dickson’s quality index, and ratio of shoot dry weight/length were variably affected in each genotype combination. From the results, it is concluded that light treatments differentially affected each genotype combination, but some parameters involving biomass production show genotypic dependency.

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“…The visible light is typically the major contributor to the photosynthesis process for sweet basil plants [ 15 ]. According to the earlier publication reports, the red and blue spectral components are the major contributors to crop growth, such as promotes vegetative growth [ 16 ] and compactness [ 17 , 18 ] and creates aroma and nutritional value [ 19 ], as shown in Figure 1 . While blue light has a short wavelength, it helps the plant adjust its growth [ 20 ] with the environmental interaction at a different stage and promotes early vegetative growth.…”

Section: Introductionmentioning

confidence: 99%

LED Illumination Spectrum Manipulation for Increasing the Yield of Sweet Basil (Ocimum basilicum L.)

Rahman

Vasiliev

Alameh

2021

Plants

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Manipulation of the LED illumination spectrum can enhance plant growth rate and development in grow tents. We report on the identification of the illumination spectrum required to significantly enhance the growth rate of sweet basil (Ocimum basilicum L.) plants in grow tent environments by controlling the LED wavebands illuminating the plants. Since the optimal illumination spectrum depends on the plant type, this work focuses on identifying the illumination spectrum that achieves significant basil biomass improvement compared to improvements reported in prior studies. To be able to optimize the illumination spectrum, several steps must be achieved, namely, understanding plant biology, conducting several trial-and-error experiments, iteratively refining experimental conditions, and undertaking accurate statistical analyses. In this study, basil plants are grown in three grow tents with three LED illumination treatments, namely, only white LED illumination (denoted W*), the combination of red (R) and blue (B) LED illumination (denoted BR*) (relative red (R) and blue (B) intensities are 84% and 16%, respectively) and a combination of red (R), blue (B) and far-red (F) LED illumination (denoted BRF*) (relative red (R), blue (B) and far-red (F) intensities are 79%, 11%, and 10%, respectively). The photosynthetic photon flux density (PPFD) was set at 155 µmol m−2 s−1 for all illumination treatments, and the photoperiod was 20 h per day. Experimental results show that a combination of blue (B), red (R), and far-red (F) LED illumination leads to a one-fold increase in the yield of a sweet basil plant in comparison with only white LED illumination (W*). On the other hand, the use of blue (B) and red (R) LED illumination results in a half-fold increase in plant yield. Understanding the effects of LED illumination spectrum on the growth of plant sweet basil plants through basic horticulture research enables farmers to significantly improve their production yield, thus food security and profitability.

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Bichromatic red and blue LEDs during healing enhance the vegetative growth and quality of grafted watermelon seedlings

Cited by 28 publications

References 44 publications

Optimal LED Wavelength Composition for the Production of High-Quality Watermelon and Interspecific Squash Seedlings Used for Grafting

Optimal LED Wavelength Composition for the Production of High-Quality Watermelon and Interspecific Squash Seedlings Used for Grafting

Influence of Light Spectra from LEDs and Scion × Rootstock Genotype Combinations on the Quality of Grafted Watermelon Seedlings

LED Illumination Spectrum Manipulation for Increasing the Yield of Sweet Basil (Ocimum basilicum L.)

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