Light signaling and plant responses to blue and UV radiations—Perspectives for applications in horticulture

Huché-Thélier, Lydie; Crespel, Laurent; Gourrierec, José Gentilhomme-Le; Morel, Philippe; Sakr, Soulaïman; Leduc, Nathalie

doi:10.1016/j.envexpbot.2015.06.009

Cited by 333 publications

(252 citation statements)

References 195 publications

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“…We also wondered whether the palisade cell phenotype of the cry1 cry2 phot1 phot2 mutant was derived from defects in canonical blue‐light signalling pathways or other unknown mechanisms related to photoreceptor function (Galvão and Fankhauser, ; Huché‐Thélier et al ., ; Casal and Qüesta, ). To investigate this, we tested the effect of monochromatic light irradiation on leaf thickening in blue‐light receptor mutants (Figure S5).…”

Section: Resultsmentioning

confidence: 97%

Multiple steps of leaf thickening during sun‐leaf formation in Arabidopsis

2019

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SummaryPlant morphological and physiological traits exhibit plasticity in response to light intensity. Leaf thickness is enhanced under high light (HL) conditions compared with low light (LL) conditions through increases in both cell number and size in the dorsoventral direction; however, the regulation of such phenotypic plasticity in leaf thickness (namely, sun‐ or shade‐leaf formation) during the developmental process remains largely unclear. By modifying observation techniques for tiny leaf primordia in Arabidopsis thaliana, we analysed sun‐ and shade‐leaf development in a time‐course manner and found that the process of leaf thickening can be divided into early and late phases. In the early phase, anisotropic cell elongation and periclinal cell division on the adaxial side of mesophyll tissue occurred under the HL conditions used, which resulted in the dorsoventral growth of sun leaves. Anisotropic cell elongation in the palisade tissue is triggered by blue‐light irradiation. We discovered that anisotropic cell elongation processes before or after periclinal cell division were differentially regulated independent of or dependent upon signalling through blue‐light receptors. In contrast, during the late phase, isotropic cell expansion associated with the endocycle, which determined the final leaf thickness, occurred irrespective of the light conditions. Sucrose production was high under HL conditions, and we found that sucrose promoted isotropic cell expansion and the endocycle even under LL conditions. Our analyses based on this method of time‐course observation addressed the developmental framework of sun‐ and shade‐leaf formation.

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Section: Resultsmentioning

confidence: 97%

Multiple steps of leaf thickening during sun‐leaf formation in Arabidopsis

2019

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“…The low R:FR ratio increases the activity of several transcription factors that activate genes involved in auxin biosynthesis leading to faster stem elongation [29]. Blue light regulates morphological responses such as shoot and internode elongation, shoot dry matter, and leaf area expansion [30]. The flower yield was affected by the light treatments.…”

Section: Plant Morphology and Flower Yieldmentioning

confidence: 97%

“…In the present study, the highest CBG and THC concentrations were measured in the NS1 treatment, which had the highest portion of blue and UV-A wavelengths in the spectrum compared to the other treatments. Blue and UV wavelengths have been previously reported to have a positive effect on the synthesis of many secondary metabolites in multiple species [30]. Mahlberg and Hemphill [23] studied the effect of light intensity and light quality on cannabinoid content in plants grown in greenhouse conditions with altered spectra using different colored filters.…”

Section: Plant Morphology and Flower Yieldmentioning

confidence: 99%

The Effect of Light Spectrum on the Morphology and Cannabinoid Content of Cannabis sativa L.

Magagnini

Grassi

Kotiranta³

2018

Med Cannabis Cannabinoids

102

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Cannabis sativa L. flowers are the main source of Δ-9-tetrahydrocannabinol (THC) used in medicine. One of the most important growth factors in cannabis cultivation is light; light quality, light intensity, and photoperiod play a big role in a successful growth protocol. The aim of the present study was to examine the effect of 3 different light sources on morphology and cannabinoid production. Cannabis clones were grown under 3 different light spectra, namely high-pressure sodium (HPS), AP673L (LED), and NS1 (LED). Light intensity was set to ∼450 µmol/m 2 /s measured from the canopy top. The photoperiod was 18L: 6D/21 days during the vegetative phase and 12L: 12D/46 days during the generative phase, respectively. At the end of the experiment, plant dry weight partition, plant height, and cannabinoid content (THC, cannabidiol [CBD], tetrahydrocannabivarin [THCV], cannabigerol [CBG]) were measured under different light treatments. The experiment was repeated twice. The 3 light treatments (HPS, NS1, AP673L) resulted in differences in cannabis plant morphology and in cannabinoid content, but not in total yield of cannabinoids. Plants under HPS treatment were taller and had more flower dry weight than those under treatments AP673L and NS1. Treatment NS1 had the highest CBG content. Treatments NS1 and AP673L had higher CBD and THC concentrations than the HPS treatment. Results were similar between experiments 1 and 2. Our results show that the plant morphology can be manipulated with the light spectrum. Furthermore, it is possible to affect the accumulation of different cannabinoids to increase the potential of medicinal grade cannabis. In conclusion, an optimized light spectrum improves the value and quality of cannabis. Current LED technology showed significant differences in growth habit and cannabinoid profile compared to the traditional HPS light source. Finally, no difference of flowering time was observed under different R:FR (i.e., the ratio between red and far-red light).

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“…Light is not only a source of energy for plant photosynthesis, but also an important environmental factor affecting plant growth and development (Huché-Thélier et al, 2016). Alterations in light quality (light spectra) can impose enormous effects on plant physiological processes, morphogenesis, growth and development; however, the effects vary between plant species (Demotes-Mainard et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Morphological and Physiological Responses of <i>Morus alba</i> Seedlings under Different Light Qualities

Dai

Guang-yu

2016

Not Bot Horti Agrobo

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Light quality can influence the photosynthetic characteristics, morphology and physiological processes of plants. To investigate the effects of different light qualities (white light, W; red light, R; blue light, B; mixture of red and blue light, RB) of light emitting diodes (LEDs) and white cold fluorescent lamp on the growth and morphology of fruiting mulberry plants (Morus alba L. cv. 'Longsang No.1'), fruiting mulberry plants were grown under different light qualities: W, R, B and RB of the same photosynthetic photo flux density (PPFD; 100 μmol m -2 s -1 ) for 20 d. Our results showed that stem length and leaf area of plants grown under R were the highest. However, stem length and leaf area of plants grown under B were lowest. Dry weights (DW), leaf mass per area (LMA), chlorophyll a/b ratio, soluble protein content, sucrose and starch content, and total leaf nitrogen (N) content of plants grown under R were the lowest. Net photosynthetic rate (Pn), stomatal conductance (gs), and actual photochemical efficiency of PSII (ΦPSII) of plants grown under RB were similar to plants grown under W. Net photosynthetic rate (Pn) and ΦPSII of plants grown under R and B were lower than plants grown under W and RB. Antioxidant enzymes activity of plants grown under R, RB and B were higher than plants grown under W. The number of leaf stomata, leaf thickness, palisade tissue length and spongy tissue length were the lowest in plants grown under R. The number of leaf stomata, leaf thickness and palisade tissue length of plants grown under RB and B were higher than plants grown under R. The results of this study indicate that a certain ratio of mixed red and blue LEDs light can reduce adverse effects of monochromatic red and blue LEDs light on fruiting mulberry growth and development.

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Light signaling and plant responses to blue and UV radiations—Perspectives for applications in horticulture

Cited by 333 publications

References 195 publications

Multiple steps of leaf thickening during sun‐leaf formation in Arabidopsis

Multiple steps of leaf thickening during sun‐leaf formation in Arabidopsis

The Effect of Light Spectrum on the Morphology and Cannabinoid Content of Cannabis sativa L.

Morphological and Physiological Responses of <i>Morus alba</i> Seedlings under Different Light Qualities

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