Quantification of the Effects of Alternating and Simultaneous Red and Blue Irradiations on Plant Morphology and Shoot Fresh Weight in Leaf Lettuce‘Greenwave’

MASUDA, Kaito; Nakashima, Hiroshi; Miyasaka, Juro; Ohdoi, Katsuaki

doi:10.2525/ecb.59.181

Cited by 6 publications

(11 citation statements)

References 25 publications

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“…The experimental procedure was previously described (Masuda et al, 2021). All experiments were conducted in a controlled environment room (2 m widthϫ5 m depthϫ2.5 m height; TAF-24KS, ESPEC MIC Co., Aichi, Japan).…”

Section: Plant Materials and Conditionsmentioning

confidence: 99%

“…The dry weight of the simultaneously irradiated plants increased with longer light periods. Masuda et al (2021) quantified the effects of several patterns of alternating and simultaneous red and blue LED irradiation (100 mmol m Ϫ2 s Ϫ1 ) on leaf lettuce morphology and weight. They concluded that only red-light irradiation maximized the shoot fresh weight and number of leaves.…”

Section: Introductionmentioning

confidence: 99%

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Effects of Time Variation of Light Intensity on the Growth of the Leaf Lettuce “Greenwave”

MASUDA

Nakashima

et al. 2022

Environmental Control in Biology

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The growth and morphogenesis of leaf lettuce in response to gradual changes in light intensity over time were investigated. Seedlings of leaf lettuce (Lactuca sativa L. var. crispa "Greenwave") were grown in a blue to red light-emitting diode (LED) ratio of 0.33 and daily light integral (DLI) of 8.7 mol m Ϫ2 d Ϫ1 . The first experiment was conducted with nine treatments, in which light intensity varied every 15 min with its peak during the day and a consistent dark period of 8 h. In the second experiment, three dark period lengths and three irradiation changes were combined based on the irradiations that produced different plant growth responses in the first experiment. Based on the results of the two experiments, most of the irradiation methods with the same DLI and dark period resulted in similar leaf lettuce growth in terms of plant weight and shape. However, plant weight was reduced when a high level of light intensity was employed for a long duration during the light period. Shorter dark periods can accelerate the growth of leaf lettuce. Consequently, the results from this study propose a new irradiation method with a non-constant light intensity in relation to time.

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Section: Plant Materials and Conditionsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Effects of Time Variation of Light Intensity on the Growth of the Leaf Lettuce “Greenwave”

MASUDA

Nakashima

et al. 2022

Environmental Control in Biology

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“…The results were the same as those of previous studies. Masuda et al (2021) quantified the effects of alternating and simultaneous red and blue irradiation (100 mmol m Ϫ2 s Ϫ1 ) on the weight and morphology of leaf lettuce. They also investigated the relationship between weight and morphological characteristics.…”

Section: Introductionmentioning

confidence: 99%

“…The difference in weight between alternating and simultaneous irradiations can be explained by leaf length. Some studies (Chen et al, 2017;Ohtake et al, 2018;Masuda et al, 2021) have suggested that the differences in leaf length and width are due to alternating versus simultaneous irradiation, but a more detailed analysis of leaf morphology is required.…”

Section: Introductionmentioning

confidence: 99%

“…They discussed the importance of geometric morphometrics in detecting the subtle morphological variations that are undetectable to the human eye, and the evolutionary implications thereof. Although leaf length and width have been measured in leaf lettuce under artificial light in previous studies (Masuda et al, 2021;Ohtake et al, 2021), leaf contour has not yet been quantified; therefore, an objective evaluation of EFD is necessary.…”

Section: Introductionmentioning

confidence: 99%

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Evaluation of Leaf Contours of the Leaf Lettuce “Greenwave” Using an Elliptic Fourier Descriptor

MASUDA

HIRAOKA

et al. 2023

Environmental Control in Biology

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To investigate the effects of different types of irradiation on the growth and morphological characteristics of leaf lettuce (Lactuca sativa L. var. crispa "Greenwave"), a quantitative analysis of the leaf contour using an elliptic Fourier descriptor (EFD) was carried out together with conventional measurement methods. Two experiments were conducted to test the different treatments. Experiment 1 investigated the effects of monochromatic/alternating/simultaneous red/blue irradiation, and Experiment 2 determined the effects of random variations in photosynthetic photon flux density (PPFD) compared with that of constant light. The growth and morphological characteristics in Experiment 1 were consistent with those of previous studies, where the shoot fresh weights in monochromatic and alternating irradiations were larger than those in simultaneous irradiations. EFD showed that the leaf length and petiole under monochromatic and alternating irradiation were longer and more apparent than those under simultaneous irradiation. In Experiment 2, both the conventional measurement methods and EFD could hardly detect any differences in leaf lettuce growth and morphological characteristics under constant PPFD. These results suggested that fluctuating PPFD within certain limits in a PFAL may have little effect on the leaf lettuce growth.

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Modifying spectral distributions during the seedling stage influences the flowering and branching of Petunia × hybrida

Rashidi

Tehranifar²,

Samiei³

2023

Scientia Horticulturae

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Quantification of the Effects of Alternating and Simultaneous Red and Blue Irradiations on Plant Morphology and Shoot Fresh Weight in Leaf Lettuce‘Greenwave’

Cited by 6 publications

References 25 publications

Effects of Time Variation of Light Intensity on the Growth of the Leaf Lettuce “Greenwave”

Effects of Time Variation of Light Intensity on the Growth of the Leaf Lettuce “Greenwave”

Evaluation of Leaf Contours of the Leaf Lettuce “Greenwave” Using an Elliptic Fourier Descriptor

Modifying spectral distributions during the seedling stage influences the flowering and branching of Petunia × hybrida

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