Relation between Changes in Photosynthetic Rate and Changes in Canopy Level Chlorophyll Fluorescence Generated by Light Excitation of Different Led Colours in Various Background Light

Ahlman, Linnéa; Bånkestad, Daniel; Wik, Torsten

doi:10.3390/rs11040434

Cited by 3 publications

(3 citation statements)

References 22 publications

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“…This includes small size, durability, long operating lifetime, and relatively cool emitting surfaces, which make them ideal light source to be used in VFALs. Another benefit of LEDs is the capability of tuning both the light quality (spectrum or wavelength) and quantity (intensity) 8 . Although LEDs enable the photosynthesis and light‐signaling functions of plants, 9,10 the challenge is now ascertaining wavelengths for any given crop in order to maximize the yield.…”

Section: Introductionmentioning

confidence: 99%

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Potential application of light emitting diodes to improve molecular, physiological, and growth responses in peppermint plant

Khazaei,

Rafiei,

Sabzalian

et al. 2023

JSFA Reports

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BackgroundClimate change and growing global population are driving forces that shift the agriculture from open fields to environmentally‐controlled confined systems. In such confined systems, plants are adapted to unique light spectra to achieve maximal qualitative and quantitative yields. In the present study, effects of five light spectra on morpho‐physiological and molecular attributes of peppermint were examined. Treatments included a traditional greenhouse considered as the control, a fluorescent light, and four types of light emitting diodes (LED): red, blue, red‐blue (70:30), and white. Leaf samples were collected from plants and analyzed for volatile constituents using a headspace GC–MS. Meanwhile, changes in the expression profile of genes involved in the biosynthesis of menthol were evaluated.ResultsOur results showed that maximal yield (wet and dry biomass) was achieved under greenhouse condition and the red‐blue LED. Application of the red‐blue LED resulted in maximal production of beneficial monoterpenes, which indicate superiority to greenhouse environment. A significant change in the gene expression profile was observed among plants grown under different light treatments. The red‐blue LED was associated with a significant up‐regulation of key genes in the menthol biosynthesis (menthol dehydrogenase and pulegone reductase). This phenomenon was consistent with a higher menthol production under the same condition.ConclusionThe application of red‐blue LED was associated with the highest level of yield and menthol production, whereas it resulted in lower concentrations of unfavorable by‐products (isomenthol, cis‐pulegone, and menthofuran). In conclusion, 70:30 red‐blue LED can be satisfactory applied to maximize growth yield and optimize favorable bioactive constituent in peppermint.

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Section: Introductionmentioning

confidence: 99%

“…Another benefit of LEDs is the capability of tuning both the light quality (spectrum or wavelength) and quantity (intensity). 8 Although LEDs enable the photosynthesis and light-signaling functions of plants, 9,10 the challenge is now ascertaining wavelengths for any given crop in order to maximize the yield.…”

Section: Introductionmentioning

confidence: 99%

Potential application of light emitting diodes to improve molecular, physiological, and growth responses in peppermint plant

Khazaei,

Rafiei,

Sabzalian

et al. 2023

JSFA Reports

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show abstract

“…We have previously shown correlation with photosynthesis [26][27][28] and used it for growth tracking [29] and for light stress detection [30][31][32]. In the latter work, the variations in the DFR originating from a weak excitation from a blue LED light were used for light stress detection.…”

Section: Introductionmentioning

confidence: 99%

Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level

et al. 2021

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Chlorophyll fluorescence is interesting for phenotyping applications as it is rich in biological information and can be measured remotely and non-destructively. There are several techniques for measuring and analysing this signal. However, the standard methods use rather extreme conditions, e.g., saturating light and dark adaption, which are difficult to accommodate in the field or in a greenhouse and, hence, limit their use for high-throughput phenotyping. In this article, we use a different approach, extracting plant health information from the dynamics of the chlorophyll fluorescence induced by a weak light excitation and no dark adaption, to classify plants as healthy or unhealthy. To evaluate the method, we scanned over a number of species (lettuce, lemon balm, tomato, basil, and strawberries) exposed to either abiotic stress (drought and salt) or biotic stress factors (root infection using Pythium ultimum and leaf infection using Powdery mildew Podosphaera aphanis). Our conclusions are that, for abiotic stress, the proposed method was very successful, while, for powdery mildew, a method with spatial resolution would be desirable due to the nature of the infection, i.e., point-wise spread. Pythium infection on the roots is not visually detectable in the same way as powdery mildew; however, it affects the whole plant, making the method an interesting option for Pythium detection. However, further research is necessary to determine the limit of infection needed to detect the stress with the proposed method.

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Physiological and Phytochemical Responses of Spinach Baby Leaves Grown in a PFAL System with LEDs and Saline Nutrient Solution

Bantis

Fotelli²,

Ilić³

et al. 2020

Agriculture

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Spinach is a leafy vegetable containing a plethora of bioactive compounds. Our study aimed to evaluate the physiological (i.e., JIP-test) and phytochemical response of spinach baby leaves grown with regular or mildly saline (40 mM NaCl) nutrient solution and irradiated by four light-emitting diodes (LEDs) with broad spectra. T1 (highest red and far-red, low blue) and T3 (high red, balanced blue, green and far-red) led to a better developed photosynthetic apparatus compared to T2 (red peak in 631 nm) and T4 (highest blue and green), highlighted by PIABS and its structural components: RC/ABS, φP0, ψE0, and ΔVIP. Elevated salinity only affected the latter parameter. T1 induced the maximum yield production but also the highest nitrate content which was far below the maximum level permitted by European legislation. Regardless of salinity level, T3 enhanced total phenol, chlorophyll, and carotenoid content. T2 and T4 led to inferior nutritional quality. Non-saline nutrient solution promoted the chlorophyll and carotenoid contents and the antioxidant potential, regardless of light treatment. By contrast, soluble sugar content was enhanced by saline nutrient solution. Our study shows that physiology and nutritional quality of spinach baby leaves can be manipulated by small interplays in the light spectra and salinity level.

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Relation between Changes in Photosynthetic Rate and Changes in Canopy Level Chlorophyll Fluorescence Generated by Light Excitation of Different Led Colours in Various Background Light

Cited by 3 publications

References 22 publications

Potential application of light emitting diodes to improve molecular, physiological, and growth responses in peppermint plant

Potential application of light emitting diodes to improve molecular, physiological, and growth responses in peppermint plant

Stress Detection Using Proximal Sensing of Chlorophyll Fluorescence on the Canopy Level

Physiological and Phytochemical Responses of Spinach Baby Leaves Grown in a PFAL System with LEDs and Saline Nutrient Solution

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