Photoperiod and Photosynthetic Photon Flux Influence Growth and Quality of Greenhouse-grown Lettuce

Gaudreau, L.; Charbonneau, Josée; Vézina, Louis‐P.; Gosselin, André

doi:10.21273/hortsci.29.11.1285

Cited by 66 publications

(40 citation statements)

References 13 publications

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“…In contrast, firmness and red pigmentation of leaves were visibly enhanced under the highest DLI. Gaudreau et al (1994) reported that low light levels result in the formation of loose lettuce heads with low fresh mass, which correspond with our visual assessment and quantitative results (Fig. 2, 3).…”

Section: Resultssupporting

confidence: 91%

Minimum Light Requirements for Indoor Gardening of Lettuce

Paz

Fisher

Gómez

2019

Urban Agric & Regnl Food Sys

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Indoor food-gardening is an important trend in horticulture. However, most research-based light recommendations are oriented towards commercial production, with recommended daily light integrals (DLI) significantly higher than those found inside a home environment. The objective was to evaluate growth (fresh and dry mass), accumulation of key phytochemical constituents (leaf photosynthetic pigment and nitrate content), and aesthetic quality (elongation and pigmentation) of red-leaf lettuce (Lactuca sativa) grown from transplant to a harvest stage in an indoor environment using different (i) light sources (lightemitting diode [LED] vs. fluorescent lamps), and (ii) light quantities (from 1.6 to 9.7 mol m -2 d -1 ). In the first experiment, four broadband white light sources were compared in a growth chamber using 5.2 mol•m -2 •d -1 : (i) 'neutral-white' 4000-K LED lamps, (ii) 'day-white' 5000-K LED lamps, (iii) 'neutral-white' 4100-K fluorescent lamps, or (iv) 'daylight' 6500-K fluorescent lamps. Lettuce grown under LED lamps produced more shoot fresh and dry mass than those grown under fluorescent lamps. However, all light sources resulted in comparable growth and quality attributes. In two separate experiments, plants were grown under one of four DLI. As DLI increased, plants had more growth, higher aesthetic quality (more compact leaves and higher pigment content), and superior nutritional quality (increased leaf concentrations of anthocyanin and carotenoid, and reduced nitrate). Based on these results, a minimum DLI of 6.5 to 9.7 mol m -2 d -1 is recommended when designing indoor gardening systems for red-leaf lettuce plants.core ideas

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Section: Resultssupporting

confidence: 91%

Minimum Light Requirements for Indoor Gardening of Lettuce

Paz

Fisher

Gómez

2019

Urban Agric & Regnl Food Sys

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“…CL has positive effects on increasing the productivity of plant species, including Arabidopsis (Lepistö et al ), lettuce (Gaudreau et al ) and some potato cultivars (Wheeler and Tibbitts ). However, CL also induces injury and damages plants (Velez‐Ramirez et al ).…”

Section: Discussionmentioning

confidence: 99%

Study of the beneficial effects of green light on lettuce grown under short‐term continuous red and blue light‐emitting diodes

Bian

Yang

et al. 2018

Physiologia Plantarum

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Red and blue light are the most important light spectra for driving photosynthesis to produce adequate crop yield. It is also believed that green light may contribute to adaptations to growth. However, the effects of green light, which can trigger specific and necessary responses of plant growth, have been underestimated in the past. In this study, lettuce (Lactuca sativa L.) was exposed to different continuous light (CL) conditions for 48 h by a combination of red and blue light-emitting diodes (LEDs) supplemented with or without green LEDs, in an environmental-controlled growth chamber. Green light supplementation enhanced photosynthetic capacity by increasing net photosynthetic rates, maximal photochemical efficiency, electron transport for carbon fixation (J ) and chlorophyll content in plants under the CL treatment. Green light decreased malondialdehyde and H O accumulation by increasing the activities of superoxide dismutase (EC 1.15.1.1) and ascorbate peroxidase (EC 1.11.1.11) after 24 h of CL. Supplemental green light significantly increased the expression of photosynthetic genes LHCb and PsbA from 6 to 12 h, and these gene expressions were maintained at higher levels than those under other light conditions between 12 and 24 h. However, a notable downregulation of both LHCb and PsbA was observed during 24 to 48 h. These results indicate that the effects of green light on lettuce plant growth, via enhancing activity of particular components of antioxidative enzyme system and promoting of LHCb and PsbA expression to maintain higher photosynthetic capacity, alleviated a number of the negative effects caused by CL.

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“…Although tipburn is considered to be a calcium deficiencyrelated disorder (Saure 1998), it is affected by a variety of environmental factors, such as light intensity (Tibbitts and Rao 1968;Gaudreau et al 1994), temperature (Yanagi et al 1983), humidity (Barta and Tibbitts 1986) and soil composition (Ashkar and Ries 1971;Brumm and Schenk 1993). Identifying cultivars showing absolute resistance to tipburn is an important but difficult task (Cox and McKee 1976;Nagata and Stratton 1994).…”

Section: Validity Of In Vitro Evaluation Of Tipburnmentioning

confidence: 99%

In vitro evaluation of tipburn resistance in lettuce (Lactuca sativa. L)

Koyama

Sanada

Itoh

et al. 2011

Plant Cell Tiss Organ Cult

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Lettuce tipburn is an irreversible physiological disorder caused by calcium deficiency that decreases the crop value. Breeding a tipburn-resistant cultivar is the only causal therapy in many cases. In this study, we investigated an efficient method to evaluate lettuce resistance to tipburn in vitro. Seedlings of 19 lettuce cultivars representing three head types were cultured on agar medium containing EGTA, which chelates Ca 2? . The percentage of tipburned leaves decreased proportionally with EGTA concentration. Susceptible cultivars were distinguished at 0.01 mM EGTA, whereas resistant cultivars were classified at 1.0 mM EGTA. Based on mean values of tipburn measurements, tipburn susceptibility was highest for 'Leaf Lettuce', followed by 'Butterhead Lettuce', and then 'Crisphead Lettuce'. Two cultivars were selected for further tests using hydroponic and pot culture. The rank order of susceptibility to tipburn in these experiments was consistent with that of the in vitro assay. The in vitro evaluation of lettuce susceptibility to calcium deficiency is useful for initial screening of lettuce cultivars against tipburn incidence. Resistant cultivars identified in this study are practical candidates for cultivation in controlled environments, such as a plant factory, while sensitive cultivars are also useful as indicator plants to monitor environmental conditions.

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Photoperiod and Photosynthetic Photon Flux Influence Growth and Quality of Greenhouse-grown Lettuce

Cited by 66 publications

References 13 publications

Minimum Light Requirements for Indoor Gardening of Lettuce

Minimum Light Requirements for Indoor Gardening of Lettuce

Study of the beneficial effects of green light on lettuce grown under short‐term continuous red and blue light‐emitting diodes

In vitro evaluation of tipburn resistance in lettuce (Lactuca sativa. L)

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