Photosynthetic apparatus performance of tomato seedlings grown under various combinations of LED illumination

Ahmed, Yousef; Ali, Muhammad Moaaz; Rizwan, Hafiz Muhammad; Tadda, S.A.; Kalaji, Hazem M.; Yang, Hao; Ahmed, Mohamed A. A.; Wróbel, Jacek; Xu, Yong; Chen, Faxing

doi:10.1371/journal.pone.0249373

Cited by 35 publications

(29 citation statements)

References 72 publications

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“…The results showed that after plants dark-acclimation the best light mode that squandered excess lowering energy were LM2 and CK ( Fig 6A ), whereas the best treatment squandered excess lowering energy was LM2 after light-acclimation ( Fig 6B ). The results obtained differed from those reported previously other researches [ 16 , 50 – 52 ], where it was reported that the mixture of red and blue light with a high ratio of red to blue led to an increase of Y(II)max (Fv/Fm).…”

Section: Discussioncontrasting

confidence: 99%

Photosynthetic performance of rocket (Eruca sativa. Mill.) grown under different regimes of light intensity, quality, and photoperiod

et al. 2021

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In recent years, much effort has been devoted to understanding the response of plants to various light sources, largely due to advances in industry light-emitting diodes (LEDs). In this study, the effect of different light modes on rocket (Eruca sativa. Mill.) photosynthetic performance and other physiological traits was evaluated using an orthogonal design based on a combination between light intensity, quality, and photoperiod factors. Some morphological and biochemical parameters and photosynthetic efficiency of the plants were analyzed. Plants grew in a closed chamber where three light intensities (160, 190, and 220 μmol m-2 s-1) provided by LEDs with a combination of different ratios of red, green, and blue (R:G:B- 7:0:3, 3:0:7, and 5:2:3) and three different photoperiods (light/dark -10/14 h, 12/12 h, and 14/10 h) were used and compared with white fluorescent light (control). This experimental setup allowed us to study the effect of 9 light modes (LM) compared to white light. The analyzes performed showed that the highest levels of chlorophyll a, chlorophyll b, and carotenoids occurred under LM4, LM3, and LM1, respectively. Chlorophyll a fluorescence measurement showed that the best effective quantum yield of PSII photochemistry Y(II), non-photochemical quenching (NPQ), photochemical quenching coefficient (qP), and electron transport ratio (ETR) were obtained under LM2. The data showed that the application of R7:G0:B3 light mode with a shorter photoperiod than 14/10 h (light/dark), regardless of the light intensity used, resulted in a significant increase in growth as well as higher photosynthetic capacity of rocket plants. Since, a clear correlation between the studied traits under the applied light modes was not found, more features should be studied in future experiments.

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Section: Discussioncontrasting

confidence: 99%

Photosynthetic performance of rocket (Eruca sativa. Mill.) grown under different regimes of light intensity, quality, and photoperiod

et al. 2021

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“…For instance, cucumber seedlings grown under equal amounts of R and B light have higher yields compared to seedlings grown under R light only 41 . Yousef and co-authors extended the study to factory tomatoes and showed that illumination with 100 μmol m −2 s −1 70% R and 30% B resulted in the optimal growth of the plants 42 . Moreover, the barrier tissue cells in the leaves were particularly well developed and the spongy tissue cells were arranged in an orderly manner 43 .…”

Section: Discussionmentioning

confidence: 99%

Increasing the performance of Passion fruit (Passiflora edulis) seedlings by LED light regimes

Liang

Ahmed

Wei

et al. 2021

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Due to progress in the industrial development of light-emitting diodes (LEDs), much work has been dedicated to understanding the reaction of plants to these light sources in recent years. In this study, the effect of different LED-based light regimes on growth and performance of passion fruit (Passiflora edulis) seedlings was investigated. Combinations of different light irradiances (50, 100, and 200 µmol m−2 s−1), quality (red, green, and blue light-emitting LEDs), and photoperiods (10 h/14 h, 12 h/12 h and 14 h/10 h light/dark cycles) were used to investigate the photosynthetic pigment contents, antioxidants and growth traits of passion fruit seedlings in comparison to the same treatment white fluorescent light. Light irradiance of 100 µmol m−2 s−1 of a 30% red/70% blue LED light combination and 12 h/12 h light/dark cycles showed the best results for plant height, stem diameter, number of leaves, internode distance, and fresh/dry shoot/root weights. 14 h/10 h light/dark cycles with the same LED light combination promoted antioxidant enzyme activities and the accumulation of phenols and flavonoids. In contrast, lower light irradiance (50 µmol m−2 s−1) had negative effects on most of the parameters. We conclude that passion fruit seedlings' optimal performance and biomass production requires long and high light irradiances with a high blue light portion.

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“…The LED lamps (UH-BLDT0510) used in this study were manufactured by Kedao Technology Corporation (Huizhou, China). Tomato seeds were planted 30 days before grafting under 100 μmol m −2 s −1 R7:B3 (red ~ 70: blue ~ 30), which was chosen as the best LED source in our previous research 54 , 55 . The seeds were sown in trays (W 28 cm × L 54 cm × H 5 cm, Luoxi Plastic Products Co., Shandong, China) filled with the commercial growing substrate (N 1 :P :1 K 1 ≥ 3%, Organic matter ≥ 45%, pH 5.5–6.5, Jiangping Enterprise Co., Fujian, China).…”

Section: Methodsmentioning

confidence: 99%

Light quality and quantity affect graft union formation of tomato plants

Ahmed

Ali

Rizwan

et al. 2021

Sci Rep

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It is already known that there are many factors responsible for the successful formation of a graft union. However, the role of light has been little studied. In an anatomical study, Scanning Electronic Microscope (SEM) was used to explore the effects of different light-emitting diodes (LEDs) on graft union formation in grafted tomato. In addition, the expression genes related to Auxin hormone signaling pathway (SAUR67, AUX1, ARF30, and LAX3) was investigated. The obtained results showed that the concrescence process occurred faster under R7:B3 light conditions, as compared to blue (B) and white fluorescent (WFL) lights. Red light application caused a delay in the vascular tissue differentiation, which may lead to callus development on both sides, causing junctional failure and resulting in ineffective graft junctional arrangement. The expression of genes related to Auxin hormone significantly increased by R7:B3 application. We suggest that LED spectra affects the graft development of tomato plants and can improve the performance of grafted tomato seedlings.

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Photosynthetic apparatus performance of tomato seedlings grown under various combinations of LED illumination

Cited by 35 publications

References 72 publications

Photosynthetic performance of rocket (Eruca sativa. Mill.) grown under different regimes of light intensity, quality, and photoperiod

Photosynthetic performance of rocket (Eruca sativa. Mill.) grown under different regimes of light intensity, quality, and photoperiod

Increasing the performance of Passion fruit (Passiflora edulis) seedlings by LED light regimes

Light quality and quantity affect graft union formation of tomato plants

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