The Growth and Development of ‘Mini Chal’ Tomato Plug Seedlings Grown under Various Wavelengths Using Light Emitting Diodes

Kim, Hye Min; Hwang, Seung Jae

doi:10.3390/agronomy9030157

Cited by 21 publications

(31 citation statements)

References 84 publications

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“…Importantly, the DQI was greater in seedlings grown with the +10 • C DIF than those in the other two treatments, implying the ability of the +10 • C DIF to yield high-quality plug seedlings. The biomass, stem diameter, and DQI are important parameters used to evaluate the quality of seedlings [34][35][36]. These results were in accordance with previous studies in tomato [19,37] and sweet pepper [38].…”

Section: Discussionsupporting

confidence: 91%

Manipulating the Difference between the Day and Night Temperatures Can Enhance the Quality of Astragalus membranaceus and Codonopsis lanceolata Plug Seedlings

2019

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Astragalus membranaceus Bunge and Codonopsis lanceolata Benth. et Hook. f. are two famous medical species in Korea, China, and Japan, mainly used for treating diseases including cancer, obesity, and inflammation. Manipulation of the difference between the day and night temperatures (DIF) is an efficient horticultural practice to regulate the growth and development of vegetables in a glasshouse. However, little research has focused on how the DIF influences the plug seedling quality of medicinal plants. In this study, uniform plug seedlings were cultivated in three environmentally controlled chambers under an average daily temperature of 20 °C with negative (−10 °C), zero, or positive (+10 °C) DIFs, and the same relative humidity (75%), photoperiod (12 h), and light intensity (150 μmol·m−2·s−1 photosynthetic photon flux density with white LEDs). The results showed that the DIF had a noticeable effect on the growth, development, and morphology of A. membranaceus and C. lanceolata plug seedlings. The positive DIF (+10 °C) significantly increased the biomass (shoot, root, and leaf), stem diameter, and Dickson’s quality index, indicating an enhanced plug seedling quality. Moreover, the contents of primary and secondary metabolites, including soluble sugar, starch, total phenols and flavonoids, were higher with higher DIFs, where the maximum values were found at 0 °C or +10 °C DIF. Furthermore, the increases in the chlorophyll content and stomatal conductance were obtained in a positive DIF, indicating that a positive DIF was favorable to photosynthesis. An analysis of the gene expression showed that a positive DIF (+10 °C) up-regulated the expression of photosynthetic genes, including GBSS, RBCL, and FDX. In conclusion, the results of this study recommend a positive DIF (+10 °C) for enhancing the quality of A. membranaceus and C. lanceolata plug seedlings.

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Section: Discussionsupporting

confidence: 91%

Manipulating the Difference between the Day and Night Temperatures Can Enhance the Quality of Astragalus membranaceus and Codonopsis lanceolata Plug Seedlings

2019

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“…In UV-A treatments, the stem diameter was not significantly different by UV-A intensity. In our previous study, stem diameter of tomato seedling was increased under Fr light treatment; however, there are non-significant differences in R/Fr ratios [22]. It seems that there are species differences in tomato and cucumber plants.…”

Section: Resultsmentioning

confidence: 67%

“…Plants 2020, 9, x FOR PEER REVIEW 7 of 13 treatment; however, there are non-significant differences in R/Fr ratios [22]. It seems that there are species differences in tomato and cucumber plants.…”

Section: Resultsmentioning

confidence: 99%

Using Light Quality for Growth Control of Cucumber Seedlings in Closed-Type Plant Production System

Jeong

Lee

Kim

et al. 2020

Plants

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During seedling production, growth control of seedlings is an important problem because the overgrowth of seedlings causes a decrease of seedling quality and has disadvantages after transplanting. In this study, we aim to evaluate the possibility of replacing chemical plant growth regulators using light quality in a closed-type plant production system (CPPS) for cucumber seedling production. We used various light treatments, such as monochromatic or combined red (R) and blue (B), and combined R and B with UV-A or Far-red (Fr) light, to compare with a chemical plant growth regulator conventionally using in nursery farms. The combined R and B treatment decreased stem elongation and increased dry matter and compactness. UV-A treatment increased compactness but did not significantly affect the stem elongation or dry matter. Fr increased stem elongation and stem diameter and decreased compactness and dry matter. In leaf growth, combined R and B treatments and UV-A treatments increased leaf area, specific leaf weight, and SPAD value, and decreased leaf shape index. Fr treatments increased leaf area and leaf shape index and decreased specific leaf weight (SLW) and SPAD values. Cucumber seedlings have many different morphological changes, and R5B5 light quality was more effective in growth control due to higher compactness than chemical plant growth regulators. Also, R5B5 light quality has increased seedling quality, such as dry matter and SLW compared with fluorescent lamps. Thus, the use of light quality is a possible alternative to a chemical plant growth regulator.

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“…moreover, while HPS technology emits a large range of the SL spectrum between the yellow-orange wavelength, with LEDs, it is possible to optimize the spectral quality for various plants and different physiological processes [9]. Consequently, recent studies have shown that for tomato plants, the best LED SL spectrum for increasing tomato production is red + blue (RB) [10], with about 90-95% of the total radiation on the red (R) wavelength and 5-10% on the blue wavelength (B) [11][12][13]. moreover, when giving a small percentage of green (G) light on the RB background, the SL penetration on plant canopy increases [14].…”

Section: Introductionmentioning

confidence: 99%

Supplemental LED Increases Tomato Yield in Mediterranean Semi-Closed Greenhouse

Palmitessa

Paciello²,

Santamaria

2020

Agronomy

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Supplemental light (SL) is a technique used to increase horticulture yield, especially in northern countries, where the Daily Light Integral (DLI) is a limiting factor during fall and winter, and which could also be used to obtain higher tomato yield at the Mediterranean latitude. In this study, three tomato hybrid (F1) cultivars were grown for year-round production in a commercial semi-closed glasshouse in Southern Italy: two of the cherry fruit-type (‘Juanita’ and ‘Sorentyno’) and one mini plum fruit-type (‘Solarino’). From 120 to 243 days after transplant, light-emitting diode (LED) toplights were used as SL, with a photoperiod of 18 h. The main climatic parameters inside and outside the glasshouse were recorded, and tomato plants’ development and yield were examined. Plants grown with LEDs had longer stems as compared to control treatment (9.53 vs. 8.79 m), a higher stem thickness and yielded more trusses. On average, the yield was 21.7% higher with LEDs. ‘Sorentyno’ was the cultivar with the highest cumulated productivity when it was grown under SL. However, the cultivar with best light use efficiency under LEDs was ‘Solarino’. Therefore, supplemental LED from mid-December until March enhanced tomato growth and yield, opening a favorable scenario for large-scale application of this technology also in the Mediterranean area.

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The Growth and Development of ‘Mini Chal’ Tomato Plug Seedlings Grown under Various Wavelengths Using Light Emitting Diodes

Cited by 21 publications

References 84 publications

Manipulating the Difference between the Day and Night Temperatures Can Enhance the Quality of Astragalus membranaceus and Codonopsis lanceolata Plug Seedlings

Manipulating the Difference between the Day and Night Temperatures Can Enhance the Quality of Astragalus membranaceus and Codonopsis lanceolata Plug Seedlings

Using Light Quality for Growth Control of Cucumber Seedlings in Closed-Type Plant Production System

Supplemental LED Increases Tomato Yield in Mediterranean Semi-Closed Greenhouse

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