Photosynthesis in Cucumbers with Pulsed or Continuous Light

Klueter, Herschel H.; Bailey, William A.; Zachariah, G. L.; Peart, R. M.

doi:10.13031/2013.34600

Cited by 5 publications

(1 citation statement)

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“…Sager and Giger (1980) examined 20 published studies of P n measured under pulsed light. The authors concluded that no study reported that the P n under pulsed light was higher than that under continuous light at the same averaged PPFD, except for a study on cucumber (Klueter et al, 1980). Jishi et al (2017) investigated the effects of average PPFD (averaged over the light and dark periods), pulse frequency, duty ratio, and their interactions on the P n of cos lettuce plants under pulsed light.…”

Section: Pulsed Light In Plant Cultivationmentioning

confidence: 99%

Time-varying Photosynthetic Photon Flux Density and Relative Spectral Photon Flux Density Distribution to Improve Plant Growth and Morphology in Plant Factories with Artificial Lighting

Jishi

Fujiwara

2021

Hort. J.

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In contrast to fluorescent lamps and high-power sodium lamps, the use of light-emitting diode (LED) lamps enables the control of not only photosynthetic photon flux density (PPFD) at the plant level, but also the relative spectral photon flux density distribution (RSPD) of light because of the variety, even at different times of day, of producible light emitted by LEDs of different types. Effects of the spectral photon flux density on plant growth and morphology have been investigated using several types of LEDs and plant species. However, few studies on lighting methods with time-varying PPFD or RSPD have been published to date. In this paper, we summarize the effects of time-varying PPFD on the net photosynthetic rate (P n) and those of time-varying RSPD on plant growth and morphology. Detailed modeling studies have been conducted on the reactions of the photosynthetic pathway under time-varying PPFD at a cycle of milliseconds to seconds. The results of these modeling studies and actual measurements of P n under pulsed light clearly indicate that pulsed light is not advantageous to improve P n. Although the integrated PPFD of blue and red light was unchanged, the growth of leaf lettuce was promoted by asynchronous irradiation with blue light and red light compared with growth under simultaneous irradiation. We think that blue-light monochromatic irradiation promotes leaf elongation through leaf expansion as a primary factor in the enhancement of plant growth. In addition, changes in leaf photosynthetic capacity caused by blue-light monochromatic irradiation may be involved in plant growth promotion. An increasing number of studies have investigated the effects of time-varying RSPD on plants. However, the mechanisms underlying these effects remain to be elucidated.

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Section: Pulsed Light In Plant Cultivationmentioning

confidence: 99%

Time-varying Photosynthetic Photon Flux Density and Relative Spectral Photon Flux Density Distribution to Improve Plant Growth and Morphology in Plant Factories with Artificial Lighting

Jishi

Fujiwara

2021

Hort. J.

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Environmental Control for Plant Production in Space CELSS

Gotō

1997

Plant Production in Closed Ecosystems

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A kinetic model for estimating net photosynthetic rates of cos lettuce leaves under pulsed light

2015

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Time-averaged net photosynthetic rate (P n) under pulsed light (PL) is known to be affected by the PL frequency and duty ratio, even though the time-averaged photosynthetic photon flux density (PPFD) is unchanged. This phenomenon can be explained by considering that photosynthetic intermediates (PIs) are pooled during light periods and then consumed by partial photosynthetic reactions during dark periods. In this study, we developed a kinetic model to estimate P n of cos lettuce (Lactuca sativa L. var. longifolia) leaves under PL based on the dynamics of the amount of pooled PIs. The model inputs are average PPFD, duty ratio, and frequency; the output is P n. The rates of both PI accumulation and consumption at a given moment are assumed to be dependent on the amount of pooled PIs at that point. Required model parameters and three explanatory variables (average PPFD, frequency, and duty ratio) were determined for the simulation using P n values under PL based on several combinations of the three variables. The model simulation for various PL levels with a wide range of time-averaged PPFDs, frequencies, and duty ratios further demonstrated that P n under PL with high frequencies and duty ratios was comparable to, but did not exceed, P n under continuous light, and also showed that P n under PL decreased as either frequency or duty ratio was decreased. The developed model can be used to estimate P n under various light environments where PPFD changes cyclically.

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Photosynthesis in Cucumbers with Pulsed or Continuous Light

Cited by 5 publications

References 0 publications

Time-varying Photosynthetic Photon Flux Density and Relative Spectral Photon Flux Density Distribution to Improve Plant Growth and Morphology in Plant Factories with Artificial Lighting

Time-varying Photosynthetic Photon Flux Density and Relative Spectral Photon Flux Density Distribution to Improve Plant Growth and Morphology in Plant Factories with Artificial Lighting

Environmental Control for Plant Production in Space CELSS

A kinetic model for estimating net photosynthetic rates of cos lettuce leaves under pulsed light

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