Development of next-generation light irradiation techniques for Japanese plant factory system powered by light-emitting diode

Shimokawa, Akihiro; Tonooka, Yuki; Matsumoto, Mitsuharu; Hirata, Shouko; Ara, Hironori; Suzuki, Hiroshi; Yamauchi, Naoki; Shigyo, Masayoshi

doi:10.17660/actahortic.2020.1271.12

Cited by 5 publications

(4 citation statements)

References 30 publications

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“…The differences in TFW and SFW in R24B0 were the largest and those in RB12 were the smallest among all treatments. These results are consistent with those of previous studies (Shimokawa et al, 2014(Shimokawa et al, , 2020Chen et al, 2017;Kuno et al, 2017;Ohtake et al, 2018;Masuda et al, 2021). The effect of irradiation on SDW differed from to that on TFW and SFW.…”

Section: Experiments 1: Comparisons Among Monochromatic Alternating A...supporting

confidence: 92%

“…One of the prospective irradiation methods for enhancing the growth of leaf lettuce is the use of alternating red (660 nm) and blue (450 nm) light irradiation (Shigyo's method) (Shimokawa et al, 2014(Shimokawa et al, , 2020. Red and blue LEDs are used for plants because chlorophylls mainly absorb these light spectra for efficient photosynthesis (Mohr and Schopfer, 1998).…”

Section: Introductionmentioning

confidence: 99%

“…Red and blue LEDs are used for plants because chlorophylls mainly absorb these light spectra for efficient photosynthesis (Mohr and Schopfer, 1998). Shimokawa et al (2014Shimokawa et al ( , 2020 found that two cultivars of leaf lettuce (Lactuca sativa L. var. crispa) were larger in size under alternating red (100 mmol m Ϫ2 s Ϫ1 ) and blue (60 mmol m Ϫ2 s Ϫ1 ) LED irradiation than under simultaneous red and blue irradiation.…”

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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Section: Experiments 1: Comparisons Among Monochromatic Alternating A...supporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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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“…Cos Lettuce) grown for 14 h using simultaneous red and blue LED irradiation (90 mmol m Ϫ2 s Ϫ1 ) was smaller than that of lettuce grown under longer lighting periods with red-light irradiation a few hours after blue light irradiation, as described by Hanyu and Shoji (2002). Shimokawa et al (2014Shimokawa et al ( , 2020 found that Shigyo's method, which involved alternating red (LED; 100 mmol m Ϫ2 s Ϫ1 ) and blue (LED; 60 mmol m Ϫ2 s Ϫ1 ) irradiation, enhanced the growth of two leaf lettuce cultivars (Lactuca sativa L. var. crispa) compared with simultaneous red and blue irradiation.…”

Section: Introductionmentioning

confidence: 95%

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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Alternating red-blue light alleviated physiological injury by reducing oxidative stress under both high light and continuous light from red-blue LEDs

Liu,

Liu

2024

Hortic. Environ. Biotechnol.

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Development of next-generation light irradiation techniques for Japanese plant factory system powered by light-emitting diode

Cited by 5 publications

References 30 publications

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

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

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

Alternating red-blue light alleviated physiological injury by reducing oxidative stress under both high light and continuous light from red-blue LEDs

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