Quality changes in hydroponic lettuce grown under pre-harvest short-duration continuous light of different intensities

Zhou, Wenjing; Liu, W.K.; Yang, Qi

doi:10.1080/14620316.2012.11512890

Cited by 55 publications

(45 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…A 24 h photoperiod promotes nitrate accumulation in green leaf lettuce, but inhibits it in red leaf lettuce. Other studies propose that continuous plant lighting might be an efficient tool for reducing nitrate contents in leafy vegetables . However, only short‐term pre‐harvest 24 h lighting strategies are efficient enough and depend on overall sensitivity of plant species and varieties to environmental parameters.…”

Section: Discussionmentioning

confidence: 99%

“…Other studies propose that continuous plant lighting might be an efficient tool for reducing nitrate contents in leafy vegetables. [14][15][16] However, only short-term pre-harvest 24 h lighting strategies are efficient enough and depend on overall sensitivity of plant species and varieties to environmental parameters. He et al 7 investigated the effects of PPFD, photoperiod, and light quality on nitrate, vitamin C, soluble sugar, soluble protein and anthocyanin contents.…”

Section: Discussionmentioning

confidence: 99%

“…However, the photoperiod length might play an important effect on nitrate content, as nitrate is mainly processed during the day and accumulated during the night, when storage into vacuoles is the most efficient . Several strategies of plant treatment with 24 h photoperiods in the pre‐harvest stage have been reported as successful for reducing nitrate contents in leafy greens . However, this could be due to a photoperiod effect or light integral effect or both combined …”

Section: Introductionmentioning

confidence: 99%

“…5 Several strategies of plant treatment with 24 h photoperiods in the pre-harvest stage have been reported as successful for reducing nitrate contents in leafy greens. [14][15][16] However, this could be due to a photoperiod effect or light integral effect or both combined. 5 Leafy green vegetables, such as lettuces or baby leaves are dominant crop in indoor horticulture and plant production facilities.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce

et al. 2019

View full text Add to dashboard Cite

BACKGROUND Understanding plant responses to light quantity in indoor horticultural systems is important for optimising lettuce growth and metabolism as well as energy utilisation efficiency. Light intensity and photoperiod sufficient for normal plant growth parameters might be not efficient for nitrate assimilation. Therefore, this study explored and compared the effects of different light intensities (100–500 μmol m−2 s−1) and photoperiods (12–24 h) on the growth and nitrate assimilation in red and green leaf lettuce (Lactuca sativa L.). RESULTS For efficient nitrate assimilation, 300–400 μmol m−2 s−1 photosynthetic photon flux density (PPFD) and 16–18 h photoperiod is necessary for red and green lettuces. The insufficient light quantity resulted in reduced growth and remarkable increase in nitrate and nitrite contents in both cultivars. Short photoperiods, similarly to low PPFD, growth parameters, chlorophyll indices and nitrate assimilation indices showed the shortage of photosynthetic products for normal plant physiological processes. Short photoperiods had the least pronounced effect on nitrate and nitrite contents in lettuce leaves. CONCLUSION Light intensity was superior compared to photoperiods for efficient nitrate assimilation in both lettuce cultivars. Under short photoperiods, similarly to low intensity, growth parameters, chlorophyll index and nitrate assimilation indices showed a shortage of photosynthetic products for normal physiological processes. The free amino acid concentration increased, but it was not efficiently incorporated in proteins, as their level in lettuce was lower compared to those for moderate photoperiods. © 2019 Society of Chemical Industry

show abstract

Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce

et al. 2019

View full text Add to dashboard Cite

show abstract

“…One of the most analysed effects was nitrate reduction (Samuolienė et al, 2009;Samuolienė et al, 2011;Bliznikas et al, 2012). The decrease in nitrate contents was accompanied by increased levels of carbohydrates and ascorbic acid in vegetable tissues (Samuolienė et al, 2012a;Zhou, Liu, & Yang, 2012;Wanlai, Liu, & Qichang, 2013). From the practical side, these research findings also propose the ways how to improve the value of green vegetables, cultivated in light deficiency conditions.…”

Section: Introductionmentioning

confidence: 96%

The effect of led lighting dosage on photosynthetic indices in tatsoi

Kačiušis¹,

Samuolienė²

2018

Research for Rural Development

View full text Add to dashboard Cite

Plant factories provide possibilities to get optimal yield of green leafy vegetables entire year independent from the season. The technology of light-emitting diode (LEDs) light has become one of the most powerful tools in photophysiological researches of various horticultural plants. In order to manage plant physiology and improve productivity, it is necessary to develop new LEDs technologies in horticulture. The aim of the study was to investigate different lighting intensities and elevated red light (660 nm) effect on tatsoi photosynthetic parameters. All plants were grown under the same light sources where overall photosynthetic photon flux density (PPFD) varied from 200 to 300 µmol m-2 s-1. Three days before harvesting red light intensity (640 and 660 nm) was increased until 132 µmol m-2 s-1 and 660 nm until 188 µmol m-2 s-1 at 16 hours photoperiod. In the last treatment merely 24 hours photoperiod was applied. The photosynthetic indices in tatsoi were determined by non-destructive methods using LI-6400XT portable photosynthesis system, OS5p fluorometer, DUALEX optical sensor and CID leaf spectrometer. Research was performed in 2017-2018 winter season. The obtained data revealed that the total photosynthetic photon flux density (PPFD) at level of 200 µmol m-2 s-1 was sufficient for optimal CO 2 assimilation in tatsoi plants. The increased PPFD of LED light at pre-harvest stage resulted in reduced photosynthetic parameters of plants.

show abstract

Effect of red and blue light supplementation on the efficacy of Noccaea caerulescens in decontaminating metals and alleviating leaching risk

Gong,

Hu,

Zhang

et al. 2024

Environ Geochem Health

View full text Add to dashboard Cite

Quality changes in hydroponic lettuce grown under pre-harvest short-duration continuous light of different intensities

Cited by 55 publications

References 0 publications

Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce

Lighting intensity and photoperiod serves tailoring nitrate assimilation indices in red and green baby leaf lettuce

The effect of led lighting dosage on photosynthetic indices in tatsoi

Effect of red and blue light supplementation on the efficacy of Noccaea caerulescens in decontaminating metals and alleviating leaching risk

Contact Info

Product

Resources

About