Photosynthetic Photon Flux Density Effects on Portulaca olearacea in Controlled-Environment Agriculture

Kudirka, Gediminas; Viršilė, Akvilė; Laužikė, Kristina; Sutulienė, Rūta; Samuolienė, Giedrė

doi:10.3390/plants12203622

Cited by 4 publications

(1 citation statement)

References 35 publications

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“…The photosynthetic response at leaf or canopy level to varying PPFD has been evaluated in dwarf tomatoes (Ke et al 2023), Portulaca olearacea (Kudirka et al 2023), tomato (Ke et al 2021), Dieffenbachia (El-Mahrouk et al 2016), cucumber (Matsuda et al 2021). However, there is a scarcity of information about the effects of limited irradiance on the photosynthetic e ciency of yam bean.…”

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confidence: 99%

Carbon enrichment enhances photosynthetic efficiency of yam bean (Pachyrhizus erosus L.) under low light conditions

Ravi,

Pushpaleela,

Raju

et al. 2024

Preprint

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Physiological responses and agricultural crop fecundity are significantly impacted due to contrasting sky conditions. Here we report the impact of the combined effect of varying photosynthetic photon flux density (PPFD) and elevated carbon dioxide on the photosynthetic responses of yam bean. We found that limited PPFD down-regulated the photosynthetic activity whereas the fertilization effect of CO2 enrichment alleviated the negative impact of limiting PPFD. The mean photosynthetic rates increased linearly and significantly across PPFD. Notably, the quantum of increment of mean photosynthetic rate across increasing PPFD was significantly higher at 600 and 800 ppm CO2 in comparison to 400 ppm and 1000 ppm due to the acclimation effect of carbon enrichment at 1000 ppm. Irrespective of the PPFD, the mean stomatal conductance (gs) rate remained high at 600, 800 and 1000 ppm in comparison to 400 ppm. As a general trend, at all CO2 levels, the mean gs increased significantly up to 50-1000 µmol m− 2 s− 1 PPFD followed by a slight down-regulation at 1200–1500 µmol m− 2 s− 1 PPFD. A similar trend was observed in the case of intracellular carbon dioxide concentration (Ci) and the ratio of intercellular to ambient CO2 concentration (Ci/Ca). As an effect of CO2 fertilization, the mean transpiration rate (E) increased linearly and significantly across all PPFD and CO2 concentrations. Our results suggest that the down-regulated photosynthesis of yam bean under cloudy conditions or limited PPFD will benefit from ECO2.

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Section: )mentioning

confidence: 99%

Carbon enrichment enhances photosynthetic efficiency of yam bean (Pachyrhizus erosus L.) under low light conditions

Ravi,

Pushpaleela,

Raju

et al. 2024

Preprint

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Lowering the target daily light integrals following days with excessive lighting can reduce lettuce production costs

Mayorga-Gomez,

van Iersel,

Ferrarezi

2024

Front. Plant Sci.

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Given the fluctuating availability of natural lighting throughout the year, supplemental light is frequently employed to maintain the optimal daily light integral (DLI) levels necessary for adequate plant growth. However, the use of supplemental light translates into higher operational costs. Recent reports suggest that plants can tolerate a day with low DLI following exposure to a day with high DLI from natural light. This was referred to as the ‘carryover’ effect. In such cases, supplemental lighting may not be necessary, resulting in energy savings. In this study, we determined if plants can withstand such DLI fluctuations over multiple days without compromising plant growth. Additionally, we calculated the energy requirements for trese treatments to evaluate the potential energy savings of the carryover effect. To test this, we cultivated lettuce plants (Lactuca sativa cv. ‘Waldmand’s Dark Green’ and ‘Rouxai’) in a walk-in grow chamber, subjecting them to six different lighting treatments. Each treatment consisted of a day with a high DLI of 22.5 mol·m-2·d-1 followed by a varying number of consecutive days with low DLI, ranging from 1 to 5 days, with DLIs of 7.5, 11.25, 12.5, 13.13, and 13.5 mol·m-2·d-1 respectively. The combined DLI for each treatment, calculated as the average DLI across high and low DLI days, was maintained at 15 mol·m-2·d-1. Additionally, we included a control treatment where plants were exposed to a constant DLI of 15 mol·m-2·d-1. We measured plant growth rate, final fresh and dry weights, leaf number, leaf area, specific leaf area, light use efficiency, and relative pigment content to assess differences in plant growth under the different lighting regimes. We observed a decrease in biomass accumulation, as indicated by a 13% reduction in final dry weight only for the treatment involving one day of high DLI followed by one day of low DLI, compared to our control. We discovered that plants can tolerate multiple days of low DLI following a day with high DLI, in contrast to the optimal values reported in the literature. This finding can lead to reduced energy consumption for supplemental lighting and consequent operational cost savings.

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Light Intensity Effects on Productivity and Post-Harvest Quality in Perilla frutescens Cultivated in CEA

Viršilė,

Gudžinskaitė,

Laužikė

et al. 2024

Agriculture

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Leafy vegetables, mainly lettuces, are currently the main crop cultivated in controlled environment agriculture (CEA), including vertical farming and plant factories. There is a rising demand to expand this portfolio with a wider variety of underutilized edible plants containing various bioactive compounds and sensory properties seeking to enrich human diets. However, the optimal cultivation conditions for these underutilized plants significantly differ from those optimized for lettuce, basil, and other popular CEA crops. Therefore, this study aims to explore the impacts of light-emitting diode (LED) lighting intensity (photosynthetic photon flux density, PPFD) on green leaf Perilla frutescens cultivated in CEA. Plants were grown under four levels of LED lighting PPFDs from 150 to 300 µmol m−2s−1 for 4 weeks. Plant biomass productivity, soluble sugar contents, antioxidant properties (DPPH, ABTS free radical scavenging activities, FRAP antioxidant power), and total contents of phenolic compounds in leaves were evaluated at harvesting time. Further, harvested plant material was stored in the dark, at +6 °C, and the water content, water loss and transpiration rate, leaf sugar contents, and antioxidant properties were monitored 1, 3, and 5 days after harvesting. The summarized data suggest that higher cultivation lighting PPFD results in better harvest quality preservation during post-harvest storage.

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Photosynthetic Photon Flux Density Effects on Portulaca olearacea in Controlled-Environment Agriculture

Cited by 4 publications

References 35 publications

Carbon enrichment enhances photosynthetic efficiency of yam bean (Pachyrhizus erosus L.) under low light conditions

Carbon enrichment enhances photosynthetic efficiency of yam bean (Pachyrhizus erosus L.) under low light conditions

Lowering the target daily light integrals following days with excessive lighting can reduce lettuce production costs

Light Intensity Effects on Productivity and Post-Harvest Quality in Perilla frutescens Cultivated in CEA

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