Comparison of HPS lighting and hybrid lighting with top HPS and intra-canopy LED lighting for high-wire mini-cucumber production

Kumar, Krishan; Hao, Xiying; Khosla, S.; Guo, Xue-Feng; Bennett, Nicholas J.

doi:10.17660/actahortic.2016.1134.15

Cited by 30 publications

(19 citation statements)

References 14 publications

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“…25% increase in DCA; Table 4; Fig. 8), similar to the reported increase in cucumber fruit yield (22%–31%) by inter-lighting in the winter season (Kumar et al , 2016). In the summer season, suboptimal nitrogen partitioning induced by sudden doubling in DPI can be overcome by pre-treatment of increasing nitrogen supply and inter-lighting ( ca .…”

Section: Discussionsupporting

confidence: 85%

Environmental triggers for photosynthetic protein turnover determine the optimal nitrogen distribution and partitioning in the canopy

Pao

Chen

Moualeu-Ngangue

et al. 2018

Journal of Experimental Botany

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Plants acclimatize their photosynthetic functions in leaves constantly to the fluctuating light, thereby optimizing the use of photosynthetic nitrogen (Nph) at the canopy level. To investigate the complex interplay between external signals during the acclimation processes, a mechanistic model based on the concept of protein turnover (synthesis and degradation) was proposed and parameterized using cucumber grown under nine combinations of nitrogen and light in growth chambers. Integrating this dynamic model into a multi-layer canopy model provided accurate predictions of photosynthetic acclimation of greenhouse cucumber canopies grown under high (HN) and low (LN) nitrogen supply in combination with day-to-day fluctuations in light at two different levels. This allowed us to quantify the degree of optimality in canopy nitrogen use for maximizing canopy carbon assimilation, which was influenced by Nph distribution along canopy depth or Nph partitioning between functional pools. Our analyses suggest that Nph distribution is close to optimum and Nph reallocation is more important under LN. Nph partitioning is only optimal under the light level similar to the average light intensity during acclimation, meaning that day-to-day light fluctuations inevitably result in sub-optimal Nph partitioning. Our study provides insights into photoacclimation and can be applied for crop model improvement.

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Section: Discussionsupporting

confidence: 85%

Environmental triggers for photosynthetic protein turnover determine the optimal nitrogen distribution and partitioning in the canopy

Pao

Chen

Moualeu-Ngangue

et al. 2018

Journal of Experimental Botany

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“…Light is the most limiting factor for greenhouse crop production in the northern regions (Li 2015). Intra-canopy lighting with LEDs substantially increases production of high-wire fruit vegetables in the greenhouse (Pettersen et al 2010;Kumar et al 2016). Here we showed that tomato production under intra-canopy lighting can be further stimulated by overhead supplementary of short duration of FR light (Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Recently, intra-canopy lightings with LEDs are widely applied for high-wire fruit vegetable production in greenhouses. It has been reported that yield can be enhanced by 10-20% under intra-canopy lighting condition for sweet bell pepper (Capsicum annuum Davos) and cucumber (Cucumis sativus Picowell) plants (Guo et al 2016;Kumar et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Zhang

Yang

et al. 2019

Journal of Integrative Agriculture

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Far-red (FR) light regulates phytochrome-mediated morphological and physiological plant responses. This study aims to investigate how greenhouse tomato morphology and production response to different durations of FR light during daytime and at the end of day (EOD). High-wire tomato plants were grown under intra-canopy lighting consisting of red (peak wavelength at 640 nm) and blue (peak wavelength at 450 nm) light-emitting diodes (LEDs) with photosynthetic photon flux density (PPFD) of 144 μmol m-2 s-1 at 10 cm away from the lamps, and combined with overhead supplemental FR light (peak wavelength at 735 nm) with PPFD of 43 μmol m-2 s-1 at 20 cm below the lamps. Plants were exposed to three durations of FR supplemental lighting including: 06:00-18:00 (FR12), 18:00-19:30 (EOD-FR1.5), 18:00-18:30 (EOD-FR0.5), and control that without supplemental FR light. The results showed that supplemental FR light significantly stimulated stem elongation thereby resulting in longer plants compared with the control. Moreover, FR light altered leaf morphology toward higher leaf length/width ratio and larger leaf area. The altered plant architecture in FR supplemented plants led to a more homogeneous light distribution inside the canopy. Total plant biomass was increased by 9-16% under supplemental FR light in comparison with control, which led to 7-12% increase in ripe fruit yield. Soluble sugar content of the ripe tomato fruit was slightly decreased by longer exposure of the plants to FR light. Dry matter partitioning to different plant organs were not substantially affected by the FR light treatments. No significant differences were observed among the three FR light treatments in plant morphology as well as yield and biomass production. We conclude that under intra-canopy lighting, overhead supplemental FR light stimulates tomato growth and production. And supplementary of EOD-FR0.5 is more favorable, as it consumes less electricity but induces similar effects on plant morphology and yield.

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“…Furthermore, obtaining whole plant data allows for a greater understanding of the interactions between environmental stimuli. This, in turn, can allow for the translation of information to controlled environment production and climate regulation related to common inputs such as CO 2 and light [ 24 – 25 ].…”

Section: Introductionmentioning

confidence: 99%

Effect of elevated CO2 and spectral quality on whole plant gas exchange patterns in tomatoes

et al. 2018

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In controlled environment plant production facilities, elevating either light or CO2 levels generally has led to increased biomass and yield due to enhanced canopy photosynthesis. Today, advancements in light-emitting diodes (LEDs) have made this technology a viable option for both supplementary lighting in greenhouses and a sole lighting source in controlled environment chambers. Our study used tomato plants grown under both ambient CO2 (AC) and elevated CO2 (EC) conditions then exposed them to various CO2 and lighting treatments during both whole plant and leaf level measurements. Plants grown under EC reached the first flower developmental stage 8 days sooner and were approximately 15cm taller than those grown under AC. However, under AC plants had more leaf area while their dry weights were similar. Of note, under EC chlorophyll a and b were lower, as were carotenoids per unit leaf area. Whole plant analyses, under all CO2 challenges, showed that plants exposed to high-pressure sodium (HPS), red-blue LED, and red-white LED had similar photosynthesis, respiration, and daily carbon gain. Under different light qualities, day-time transpiration rates were similar among CO2 conditions. Day-time water-use efficiency (WUE) was higher in plants grown and exposed to EC. Similarly, WUE of plants grown under AC but exposed to short-term elevated CO2 conditions was higher than those grown and tested under AC during all light treatments. Under all CO2 conditions, plants exposed to red-white and red-blue LEDs had lower WUE than those exposed to HPS lighting. Assessing alterations due to CO2 and light quality on a whole plant basis, not merely on an individual leaf basis, furthers our understanding of the interactions between these two parameters during controlled environment production. Principle component analyses of both whole plant and leaf data indicates that increasing CO2 supply has a more dramatic effect on photosynthesis and WUE than on transpiration.

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Comparison of HPS lighting and hybrid lighting with top HPS and intra-canopy LED lighting for high-wire mini-cucumber production

Cited by 30 publications

References 14 publications

Environmental triggers for photosynthetic protein turnover determine the optimal nitrogen distribution and partitioning in the canopy

Environmental triggers for photosynthetic protein turnover determine the optimal nitrogen distribution and partitioning in the canopy

Overhead supplemental far-red light stimulates tomato growth under intra-canopy lighting with LEDs

Effect of elevated CO2 and spectral quality on whole plant gas exchange patterns in tomatoes

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