Precision Stressing by Uv-B Radiation to Improve Quality of Spinach Under Protected Cultivation

Heuberger, Heidi; Praeger, Ulrike; Georgi, Manfred; Schirrmacher, Georg; Graßmann, Johanna; Schnitzler, W. H.

doi:10.17660/actahortic.2004.659.25

Cited by 14 publications

(10 citation statements)

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“…One protection mechanism is the altered synthesis of antioxidant substances like essential oils, carotenoids, phenolics, as well as other secondary metabolites. Effects of PAR and UV-B radiation on herbs and other plant species were already reported by some authors (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14). UV-B can also essentially influence the growth of herbs (15).…”

Section: Introductionmentioning

confidence: 75%

Effects of PAR and UV‐B Radiation on Herbal Yield, Bioactive Compounds and Their Antioxidant Capacity of Some Medicinal Plants Under Controlled Environmental Conditions

Manukyan

2012

Photochem & Photobiology

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Photosynthetically active radiation (PAR) and Ultraviolet B (UV-B) radiation are among the main environmental factors acting on herbal yield and biosynthesis of bioactive compounds in medicinal plants. The objective of this study was to evaluate the influence of biologically effective UV-B light (280-315 nm) and PAR (400-700 nm) on herbal yield, content and composition, as well as antioxidant capacity of essential oils and polyphenols of lemon catmint (Nepeta cataria L. f. citriodora), lemon balm (Melissa officinalis L.) and sage (Salvia officinalis L.) under controlled greenhouse cultivation. Intensive UV-B radiation (2.5 kJ m(-2) d(-1) ) influenced positively the herbal yield. The essential oil content and composition of studied herbs were mainly affected by PAR and UV-B radiation. In general, additional low-dose UV-B radiation (1 kJ m(-2) d(-1) ) was most effective for biosynthesis of polyphenols in herbs. Analysis of major polyphenolic compounds provided differences in sensitivity of main polyphenols to PAR and UV-B radiation. Essential oils and polyphenol-rich extracts of radiated herbs showed essential differences in antioxidant capacity by the ABTS system. Information from this study can be useful for herbal biomass and secondary metabolite production with superior quality under controlled environment conditions.

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Section: Introductionmentioning

confidence: 75%

Effects of PAR and UV‐B Radiation on Herbal Yield, Bioactive Compounds and Their Antioxidant Capacity of Some Medicinal Plants Under Controlled Environmental Conditions

Manukyan

2012

Photochem & Photobiology

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“…" at low and medium dose; # at high doseHeuberger et al (2004) …”

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confidence: 99%

A comprehensive review on carotenoids in foods and feeds: status quo, applications, patents, and research needs

Meléndez-Martínez

Mandić

Bantis

et al. 2021

Critical Reviews in Food Science and Nutrition

173

107

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Carotenoids are isoprenoids widely distributed in foods that have been always part of the diet of humans. Unlike the other so-called food bioactives, some carotenoids can be converted into retinoids exhibiting vitamin A activity, which is essential for humans. Furthermore, they are much more versatile as they are relevant in foods not only as sources of vitamin A, but also as natural pigments, antioxidants, and health-promoting compounds. Lately, they are also attracting interest in the context of nutricosmetics, as they have been shown to provide cosmetic benefits when ingested in appropriate amounts. In this work, resulting from the collaborative work of participants of the COST Action European network to advance carotenoid research and applications in agrofood and health (EUROCAROTEN, www.eurocaroten.eu, https://www.cost.eu/actions/CA15136/ #tabsjName:overview) research on carotenoids in foods and feeds is thoroughly reviewed covering aspects such as analysis, carotenoid food sources, carotenoid databases, effect of processing and storage conditions, new trends in carotenoid extraction, daily intakes, use as human, and feed additives are addressed. Furthermore, classical and recent patents regarding the obtaining and formulation of carotenoids for several purposes are pinpointed and briefly discussed. Lastly, emerging research lines as well as research needs are highlighted.

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“…m -2 day -1 ) resulted in a 2.7--fold increase in ascorbate levels [59], whereas α--tocopherol 7 levels increased about eightfold in spinach and lettuce (Lactuca sativa) that were exposed 8 to UV--B for one week [60]. Exposure to 1.4 W m -2 UV--B resulted in a 4.5--fold increase in 9 total GSH levels in pea [57].…”

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confidence: 99%

UV-B exposure, ROS, and stress: inseparable companions or loosely linked associates?

Hideg

Jansen

Strid

2013

Trends in Plant Science

542

382

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All authors contributed equally to this paperCorresponding author: Jansen, M.A.K. (M.Jansen@ucc.ie). concepts, or if they are artifacts of particularly harsh UV exposure conditions. We examine UV--B doses induce considerable alterations in antioxidant status, but that there is no direct 10 evidence that these changes are mediated by ROS. 11Is UV--B radiation a stressor? 12To address the question of whether UV--B radiation is a stressor, it is necessary to define exposed to a 'stress' (a force) which results in a 'strain' (bending). In plant sciences, the 21 terms of 'stress factor' or 'stressor' are used to describe this imposed, external factor. 22Exposure of plants to a stressor can cause reversible, elastic eustress (strain or bending in increased water--use efficiency [20]. In contrast, distress is a severe stress that has a 7 predominantly negative effect on the plant and its development, and is also referred to as tolerance, and can be induced by below ambient, chronic UV--doses which do not cause 21 substantial damage [6,8,26]. These responses can therefore be defined as eustress. 22However, whereas productivity may not be directly affected by UV--radiation under depend on UV--dose and/or the spectral quality, but will also depend on, for example, 5 background intensity of photosynthetically active radiation (PAR), plant acclimation state

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Precision Stressing by Uv-B Radiation to Improve Quality of Spinach Under Protected Cultivation

Cited by 14 publications

References 14 publications

Effects of PAR and UV‐B Radiation on Herbal Yield, Bioactive Compounds and Their Antioxidant Capacity of Some Medicinal Plants Under Controlled Environmental Conditions

Effects of PAR and UV‐B Radiation on Herbal Yield, Bioactive Compounds and Their Antioxidant Capacity of Some Medicinal Plants Under Controlled Environmental Conditions

A comprehensive review on carotenoids in foods and feeds: status quo, applications, patents, and research needs

UV-B exposure, ROS, and stress: inseparable companions or loosely linked associates?

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