Influences of LED Light Quality and Intensity on Stomatal Behavior of Three Petunia Cultivars Grown in a Semi-closed System

Sakhonwasee, Siriwat; Tummachai, Kittipoom; Nimnoy, Ninlawan

doi:10.2525/ecb.55.93

Cited by 7 publications

(7 citation statements)

References 40 publications

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“…However, stomatal density in the R LED-treated leaves was lower ( Figure 5(A4,B2)), which may be related to the lower water loss during transpiration in the plants and leaf edge curling. Therefore, the higher light intensity with the B LEDs increases stomatal density [50,74] and may enhance the photosynthetic rate and stomatal conductance in the early growth stage of Eustoma leaves. thicker abaxial epidermal layer resulting from treatment with B LEDs may be beneficial for increasing the photosynthetic rate and CO2 fixation of Eustoma leaves.…”

Section: Discussionmentioning

confidence: 99%

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

2017

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Abstract:In a controlled environment, light from light-emitting diodes (LEDs) has been associated with affecting the leaf characteristics of Eustoma. LEDs help plant growth and development, yet little is known about photosynthetic performance and related anatomical features in the early growth stage of Eustoma leaves. In this study, we examined the effects of blue (B), red (R), and white (W) LEDs on the photosynthetic performance of Eustoma leaves, as well as leaf morphology and anatomy including epidermal layer thickness, palisade cells, and stomatal characteristics. Leaves grown under B LEDs were thicker and had a higher chlorophyll content than those grown under the R and W LEDs. Leaves under B LEDs had greater net photosynthetic rates (A), stomatal conductance (g s ), and transpiration rates (E), especially at a higher photon flux density (PPFD), that resulted in a decrease in the intercellular CO 2 concentration (C i ), than leaves under the W and R LEDs. B LEDs resulted in greater abaxial epidermal layer thickness and palisade cell length and width than the R and W LED treatments. The palisade cells also developed a more cylindrical shape in response to the B LEDs. B LED leaves also showed greater guard cell length, breadth, and area, and stomatal density, than W or R LEDs, which may contribute to increased A, g s and E at higher PPFDs.

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Section: Discussionmentioning

confidence: 99%

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

2017

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“…One month after sowing, seedlings were transferred to 7-inch plastic pots and grown under either warm white (3200 K), daylight (6500 K) (Ledonhome Trading Co., Ltd., Bangkok, Thailand) or combined red and blue (RB) LED light treatments (Shigyo TM ; Showa Denko K. K., Tokyo, Japan) until the end of experiment; five months after seed sowing. The spectrum details of all LED lights were published by Sakhonwasee et al (2017). The percentages of blue (B, 400-500 nm), green (G, 500-600 nm) and red (R, 600-700 nm) light in each treatment, measured by Photosynthetically Active Radiation (PAR) meter (101EG; Nippon Medical & Chemical Instruments Co., Ltd., Osaka, Japan), were 9.7% B + 36.1% G + 54.2% R for 3200 K, 26.5% B + 39.9% G + 33.6% R for 6500 K and 30.2% B + 2.2% G + 67.6% R for RB.…”

Section: Plant Materials and Growth Conditionsmentioning

confidence: 99%

Reproductive Development, Seed Yield and Seed Quality of Gloxinia (<i>Sinningia speciosa</i>) in a Closed Plant Production System as Influenced by LED Light Quality and Intensity

Sudthai

Sakhonwasee

2022

Hortic J

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The flower seed industry is facing a variety of issues related to ongoing climate change. The closed plant production system (CPPS) may be a solution to these issues as the environment inside the system can be fully controlled to allow seed production from many plant species. In this study, the influence of an artificial light condition, one of the key factors influencing plant growth and development in CPPS, on gloxinia (Sinningia speciosa) seed production was investigated. Three types of lights: warm white (3200 K), daylight ( 6500K), and red and blue lights (RB) at a photosynthetic photon flux density of either 150 or 200 μmol•m −2 •s −1 were applied to gloxinia plants. The highest vegetative growth was found in plants grown under 3200 K at 200 μmol•m −2 •s −1 light but this did not correlate with seed yield. Plants grown under RB light exhibited the most compact canopy. Day to anthesis, flower diameter and percentage of pod set were not significantly different among the light treatments. Gloxinia plants grown under RB light at 150 μmol•m −2 •s −1 had the highest seed yield, which is attributed to higher pollen elongation and flower number. The effect of light quality on seed yield is strongly dependent on light intensity. Moreover, treatment with RB light resulted in longer pollen grains and seeds than the other light quality treatments. Gloxinia seeds from all light treatment exhibited more than 80% germination and similar seed vigor. The results from this study suggest that CPPS, with suitable light conditions, may be used for commercial gloxinia seed production.

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“…The photo-response was tested with a green light source (using an LED of 533 nm and 50 mW) and a red light source (an LED of 633 nm, 50 mW), as the white light contains maximum contribution from these wavelengths. [40] As suggested by the UV-Visible absorption spectra, there is no (negligible) absorption from MoO 3 NR in this frequency range since its absorption edge is at ≈438 nm. The photoresponses of MoS 2 NR, MoS 2 /MoO x NR, and MoS 2 /MoO x NR + C black (as C-black is added with the active material during electrode fabrication for the battery) are measured, Figure 2c.…”

Section: Photocurrent Measurementsmentioning

confidence: 84%

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

Kumar

Thakur

Sharma

et al. 2021

Small

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sectors, such as in high energy density demand portable devices, solar vehicles, solar impulse planes, satellites, etc. [4][5][6] This concept was initially proposed by Hodes et al. in 1976, where they have shown a three-electrode system comprised of cadmium selenide, sulfur, and silver sulfide (CdSe/S/Ag 2 S). [7] In this system, one of the components acted as photoelectrode while the others acted as the components for the energy storage. Such efforts have continued with other threeelectrode systems, such as n-cadmium selenide telluride/cesium sulfide/tin sulfide [8] and hybrid titania (TiO 2 ) poly(3,4ethylenedioxythiophene) as photo anode and a perchlorate (ClO 4 − )-doped polypyrroles counter electrode. This approach was improved by using a two-electrode system with a hybrid mixture of lithium iron phosphate (LFP) nanocrystals and N719 dye as the active photo-electrode assembled with lithium metal as counter electrode. [9] The N719 dye acts as photon absorber and lithium iron phosphate (LFP) as cathode. In this system, during the photocharging, the electrons produced during the photo-excitation of the dye generate holes in the valance band which repel Li-ions from their intercalated state. The continuous photo-conversion drives the battery to reach back in the charged state (in 30 h) with a 200 W solar spectrum (simulator). [9] It has low photo conversion efficiency and it was observed that soon after the first cycle, the charge capacity started fading due to dissolution of the organic dye in to the organic electrolyte.A different approach was attempted later, where a polycrystalline metal halide based 2D perovskite was used as a photoactive electrode ((C 6 H 9 C 2 H 4 NH 3 ) 2 PbI 4 ) that could provide both energy storage (battery functionality) and photo charging (photovoltaic functionality). [10] This perovskite system provided a low photo conversion efficiency of ≈0.034%. Furthermore, the system suffered from various other challenges such as the conversion reaction between lithium and perovskite generating lead (Pb), where it can further alloy with lithium causing a large volume expansion.More recently, it was reported that an organic molecule based photo-electrode could also be used for photo charging. [11] Absorption of light of a desired wavelength by lithiatedtetrakislawsone electrodes generates electron-hole pairs, and the holes oxidize the lithiated-tetrakislawsone to tetrakislawsone while the generated electrons flow from the tetrakislawsone New ways of directly using solar energy to charge electrochemical energy storage devices such as batteries would lead to exciting developments in energy technologies. Here, a two-electrode photo rechargeable Li-ion battery is demonstrated using nanorod of type II semiconductor heterostructures with in-plane domains of crystalline MoS 2 and amorphous MoO x . The staggered energy band alignment of MoS 2 and MoO x limits the electron holes recombination and causes holes to be retained in the Li intercalated MoS 2 electrode. The holes generated in the MoS 2 pushes...

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Influences of LED Light Quality and Intensity on Stomatal Behavior of Three Petunia Cultivars Grown in a Semi-closed System

Cited by 7 publications

References 40 publications

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

Response of Eustoma Leaf Phenotype and Photosynthetic Performance to LED Light Quality

Reproductive Development, Seed Yield and Seed Quality of Gloxinia (<i>Sinningia speciosa</i>) in a Closed Plant Production System as Influenced by LED Light Quality and Intensity

Photo Rechargeable Li‐Ion Batteries Using Nanorod Heterostructure Electrodes

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