Moderate UV-A supplementation benefits tomato seed and seedling invigoration: a contribution to the use of UV in seed technology

Mariz-Ponte, Nuno; Mendes, Rafael J.; Sario, Sara; Melo, Paula; Santos, Conceição

doi:10.1016/j.scienta.2018.03.025

Cited by 21 publications

(20 citation statements)

References 48 publications

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“…In the present study, T1 and T2 presented the best results, indicating that in addition to light quality, the photoperiod is an important variable for plant growth. In accordance with the results of Kang et al (2018) and Mariz-Ponte et al (2018), the chlorophyll values did not vary significantly between treatments. Furthermore, the stem diameters and chlorophyll quantities did not display statistical differences, consistent with the experiment results reported by Hern andez and Kubota (2012), who evaluated ratios of R/B with different DLI values for 'Komeett' tomato seedlings.…”

Section: Discussionsupporting

confidence: 90%

“…Ultraviolet-A supplementation has been proven to have beneficial effects on seedlings growth and secondary metabolite production. Mariz-Ponte et al (2018) found an increase in shoot length, cotyledon area, length/size, and fresh matter in tomato seedlings irradiated with ultraviolet-A, but a reduction in dry matter in some treatments; however, the chlorophyll-a (Chl-a) and chlorophyll-b (Chl-b) contents were unaffected. Kang et al (2018) showed that ultraviolet-A stimulated plant biomass production in larger leaves and did not induce any stress because the chlorophyll content was unaffected.…”

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confidence: 99%

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Effect of Extended Photoperiod with a Fixed Mixture of Light Wavelengths on Tomato Seedlings

Aguirre‐Becerra¹,

García‐Trejo²,

Vázquez-Hernández³

et al. 2020

horts

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Light is an abiotic factor, and its quality, quantity, and photoperiod can be modulated to work as eustress inductors to regulate plant processes. It is known that red (R), blue (B), far-red (FR), and ultraviolet-A wavelengths can promote photomorphogenesis and secondary metabolite production in plants. Several ratios of R:B and the addition of end of-day FR, separately, have beneficial effects on plant development, whereas adding ultraviolet-A enhances the production of secondary metabolites such as phenols. However, the effects of extended photoperiods with a mixture of these four wavelengths and extra end-of-day FR have not been evaluated for plants of commercial interest. The objective of this study was to determine the effects on tomato seedlings (‘Saladette’, CORDOBA F1) of different overnight photoperiods using a fixed combination of R (625 nm), B (460 nm), FR (720 nm), and ultraviolet-A (410 nm). We expected increases in the production of specialized metabolites and the generation of beneficial changes in the seedling biomass and morphology. Four treatments involving overnight artificial light provided by a light-emitting diode (LED) module were established: TC (control), 0 h; T1, 4 hours; T2, 8 hours; and T3, 12 hours. All treatments were subjected to a 12-hour natural photoperiod and 12 hours of overnight artificial light. The experiment lasted 4 weeks, and plants were sampled every week for physical and phytochemical measurements. In general, seedlings subjected to 4-hour and 8-hour treatments presented better results than those subjected to the control and 12-hour overnight photoperiod treatments. Seedlings subjected to treatments with an 8-hour overnight photoperiod presented large accumulation of biomass in the stem rather than in the leaves because they had large stem dry weight, stem weight, and elongation and higher first, second, and third internode lengths; however, they had lower leaf area, leaf dry weight, and health index. Seedlings subjected to treatment with a 4-hour overnight photoperiod were visually bigger, with large leaf expansion, total length, stem weight, total weight, and specific leaf area; however, this treatment had a negative impact on the biomass accumulation, with lower leaf weight, stem dry weight, and health index. The 12-hour treatment had a negative impact on the leaf area, and thus the specific leaf area, of seedlings; however, the biomass accumulation was large, with higher leaf dry weight, total dry matter, and specific leaf area, but no difference in stem dry weight compared with the control. At the end of the experiment, the total phenolic content increased in all treatments compared with the control, but the flavonoid content decreased. Moreover, the antioxidant capacity was higher for T2 during the last 2 weeks of the experiment. Results are discussed according to the possibilities of using this light strategy for seedling production.

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Section: Discussionsupporting

confidence: 90%

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confidence: 99%

Effect of Extended Photoperiod with a Fixed Mixture of Light Wavelengths on Tomato Seedlings

Aguirre‐Becerra¹,

García‐Trejo²,

Vázquez-Hernández³

et al. 2020

horts

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“…Nevertheless, in the last decade, a new agricultural paradigm emerged, which considers UV-supplementation as a strategy to improve crop yield and/or quality [ 7 , 8 , 9 , 10 , 11 ]. Besides, UV-irradiation systems do not pose legal restrictions, and some systems (e.g., UV-A, LED-UV) are easily affordable.…”

Section: Introductionmentioning

confidence: 99%

Physiological, Biochemical and Molecular Assessment of UV-A and UV-B Supplementation in Solanum lycopersicum

Mariz-Ponte

Mendes

Sario

et al. 2021

Plants

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Daily UV-supplementation during the plant fruiting stage of tomato (Solanum lycopersicum L.) growing indoors may produce fruits with higher nutraceutical value and better acceptance by consumers. However, it is important to ensure that the plant’s performance during this stage is not compromised by the UV supplement. We studied the impact of UV-A (1 and 4 h) and UV-B (2 and 5 min) on the photosynthesis of greenhouse-grown tomato plants during the fruiting/ripening stage. After 30 d of daily irradiation, UV-B and UV-A differently interfered with the photosynthesis. UV-B induced few leaf-necrotic spots, and effects are more evidenced in the stimulation of photosynthetic/protective pigments, meaning a structural effect at the Light-Harvesting Complex. UV-A stimulated flowering/fruiting, paralleled with no visible leaf damages, and the impact on photosynthesis was mostly related to functional changes, in a dose-dependent manner. Both UV-A doses decreased the maximum quantum efficiency of photosystem II (Fv/Fm), the effective efficiency of photosystem II (ΦPSII), and gas exchange processes, including net carbon assimilation (PN). Transcripts related to Photosystem II (PSII) and RuBisCO were highly stimulated by UV supplementation (mostly UV-A), but the maintenance of the RuBisCO protein levels indicates that some protein is also degraded. Our data suggest that plants supplemented with UV-A activate adaptative mechanisms (including increased transcription of PSII peptides and RuBisCO), and any negative impacts on photosynthesis do not compromise the final carbohydrate balances and plant yield, thus becoming a profitable tool to improve precision agriculture.

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“…Aladjadjiyan 2012), as in germination, which conditions the vigor of the plants and could be the basis for intensification of crop production (Mariz-Ponte et al 2018). Physical methods for seed invigoration have advantages over conventional treatments based on chemical substances, e.g.…”

Section: Introductionmentioning

confidence: 99%

Characterization of Bean Seeds, Germination, and Phenolic Compounds of Seedlings by UV-C Radiation

Hernández-Aguilar

Domínguez-Pacheco

Palma-Tenango

et al. 2020

J Plant Growth Regul

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We quantitatively evaluate the effects of UV-C radiation on bean seeds Oti (Phaseolus vulgaris), their germination and phenolic compounds of seedlings, by means of photoacoustic spectroscopy and scanning electron microscopy. It is shown that: i) The photoacoustic signal produced by the bean seeds exposed to UV-C radiation during 15 minutes, reduces from 0.24 to 0.10 mV for the wavelengths of 295 and 340 nm, as a result of their degradation. This significant reduction of 58.3% decreases, but keeps over 50% for other spectral UV wavelengths within the interval (270-400 nm). ii) As the UV-C radiation time increases from 2 to 15 min, the morphological changes at the surface of the bean seeds exhibits micro-holes and detachment of the cotyledon sclereids. iii) There are no significant statistical differences in the variables of germination, dry weight and seedling length, for exposure times up to 15 minutes. iv). The phenolic acids and flavonoids of the bean seedlings of seeds treated by UV-C for different exposure times (0, 2, 5, 10 and 15 min) display significant statistical differences (P ≤ 0.05) in both roots and foliage. For both the roots and foliage, the highest concentration of phenolic acids is observed at 10 and 15 minutes, while for root flavonoids, it appears at 5 and 15 minutes.

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Moderate UV-A supplementation benefits tomato seed and seedling invigoration: a contribution to the use of UV in seed technology

Cited by 21 publications

References 48 publications

Effect of Extended Photoperiod with a Fixed Mixture of Light Wavelengths on Tomato Seedlings

Effect of Extended Photoperiod with a Fixed Mixture of Light Wavelengths on Tomato Seedlings

Physiological, Biochemical and Molecular Assessment of UV-A and UV-B Supplementation in Solanum lycopersicum

Characterization of Bean Seeds, Germination, and Phenolic Compounds of Seedlings by UV-C Radiation

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