Morphological and biochemical responses of broccoli florets to supplemental ultraviolet-B illumination

Topcu, Yasin; Doğan, Adem; Sahin‐Nadeem, Hilal; Polat, Ersin; Kasimoglu, Zehra; Erkan, Mustafa

doi:10.1016/j.agee.2018.02.027

Cited by 11 publications

(12 citation statements)

References 71 publications

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“…Exposure to eUV-B affects the photosynthetic pigment content through damage to thylakoid membranes due to excess production of ROS. Total chlorophyll content decreased under eUV-B, as also reported in C. ferskohlii (Takshak & Agrawal, 2015) and broccoli (Topcu et al, 2018). Chlorophyll degradation correlated well with membrane damage.…”

Section: Discussionsupporting

confidence: 80%

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Effects of plant age on performance of the tropical perennial fodder grass,Cenchrus ciliarisL. subjected to elevated ultraviolet‐B radiation

et al. 2020

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• Abiotic stress, notably high ultraviolet-B (eUV-B), limit growth and productivity of many crop plants, but information on response of forage grasses to eUV-B radiation is rather limited. • The present study was therefore conducted to increase our understanding of differential age-related responses on growth, metabolism and fodder quality of Cenchrus ciliaris-3108 (Buffel grass) to elevated UV-B (eUV-B: 7.2 kJÁm À2 Áday À1). • Plant growth at both growth stages was notably reduced in response to eUV-B, except for the number of nodes and tillers at vegetative and reproductive stages. At anthesis, tillering increased due to the perennial habit of this plant, but leaf senescence reduced the number of leaves per tiller. Unlike ambient UV-B, eUV-B at the vegetative stage resulted in diversion of photosynthate for the formation of secondary metabolites (tannins and phenolics), providing dual protection from photooxidative damage and from herbivory. • The forage biomass as well as quality showed a marked decline under eUV-B and relative nutritive value was reduced at both growth stages.

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Section: Discussionsupporting

confidence: 80%

“…A similar reduction in root length and plant height under eUV‐B was reported in Brassica oleracea var. italica (Topcu et al , 2018). One effect of excess UV‐B is the degradation of indoleacetic acid, which inhibits tissue elongation and depends on endogenous auxin availability (Ros & Tevini, 1995).…”

Section: Discussionmentioning

confidence: 99%

Effects of plant age on performance of the tropical perennial fodder grass,Cenchrus ciliarisL. subjected to elevated ultraviolet‐B radiation

et al. 2020

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“…Under prolonged UV-B exposure, at least four genes involved in GL biosynthesis were downregulated in Arabidopsis, whereas short-term exposure led to enhanced GL content, probably following the activation of jasmonic acid and salicylic acid pathways ( 129 ). Pre-harvest and/or supplementary UV radiation might be also beneficial in increasing levels of health beneficial substances and altering the pathways related to the biosynthesis of various secondary metabolites, particularly nitrogen-containing molecules ( 115 , 130 , 131 ). The pre-harvest treatment of broccoli sprouts treated with UV-B radiation at doses ranging from 0.3 to 1 kJ/m 2 /d prompted an increase in the levels of both aliphatic and indole GLs ( 114 ).…”

Section: Factors Affecting Gls Synthesis and Accumulationmentioning

confidence: 99%

“…The pre-harvest treatment of broccoli sprouts treated with UV-B radiation at doses ranging from 0.3 to 1 kJ/m 2 /d prompted an increase in the levels of both aliphatic and indole GLs ( 114 ). Using a combined treatment (10 mM CaCl 2 and 0.18 Wh/m 2 UV-B) on young broccoli microgreens (shoots of the young plant), an increase in GL content correlated essentially with an increase in singrin content at 8.8 kJ/m 2 /d was obtained ( 115 ).…”

Section: Factors Affecting Gls Synthesis and Accumulationmentioning

confidence: 99%

Pre- and Post-harvest Factors Affecting Glucosinolate Content in Broccoli

et al. 2020

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Owing to several presumed health-promoting biological activities, increased attention is being given to natural plant chemicals, especially those frequently entering the human diet. Glucosinolates (GLs) are the main bioactive compounds found in broccoli (Brassica oleracea L. var. italica Plenck). Their regular dietary assumption has been correlated with reduced risk of various types of neoplasms (lung, colon, pancreatic, breast, bladder, and prostate cancers), some degenerative diseases, such as Alzheimer's, and decreased incidence of cardiovascular pathologies. GL's synthesis pathway and regulation mechanism have been elucidated mainly in Arabidopsis. However, nearly 56 putative genes have been identified as involved in the B. oleracea GL pathway. It is widely recognized that there are several pre-harvest (genotype, growing environment, cultural practices, ripening stage, etc.) and post-harvest (harvesting, post-harvest treatments, packaging, storage, etc.) factors that affect GL synthesis, profiles, and levels in broccoli. Understanding how these factors act and interact in driving GL accumulation in the edible parts is essential for developing new broccoli cultivars with improved health-promoting bioactivity. In this regard, any systematic and comprehensive review outlining the effects of pre-and post-harvest factors on the accumulation of GLs in broccoli is not yet available. Thus, the goal of this paper is to fill this gap by giving a synoptic overview of the most relevant and recent literature. The existence of substantial cultivar-to-cultivar variation in GL content in response to pre-harvest factors and post-harvest manipulations has been highlighted and discussed. The paper also stresses the need for adapting particular pre-and post-harvest procedures for each particular genotype in order to maintain nutritious, fresh-like quality throughout the broccoli value chain.

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“… + strictosidine, ajmalicine, catharanthine, tabersonine, serpentine, vindoline, vimblastine, 3’,4’-anhydrovinblastine + tryptophan decarboxylase 136 Broccoli – Day G Narrowband Philips TL F72T12 100 W/01 2.2; 8.8; 16.4 1.36; 2.29; 2.27 27 min, 64 min, 120 min n.a. + phenolics & flavonoids -carotenoids, chlorophyll + sinigrin (glucosinolate) +/− glucotropaelolin 35 Broccoli – Day L TL 20 W/12 RS or TL 40 W/12 RS (Philips) 16.41; 24.01 2.28; 3.34 2 h n.a. +indolyl GS, aliphatic GS (low & high UV-B, 2 h and 24 h past irradiation, PI) Low UV-B: + total phenols (2 h past irradiation, PI), - total phenols (24 h PI) High UV-B: − total phenols (2 h past irradiation, PI); +/− total phenols (24 h PI) Change in individual compounds 142 Antarctic pearlwort – Day L Narrowband PL-L 36 W/01/4 P UV-B (Philips) 3.6; 21.6 0.05; 0.3 20 h n.a.…”

Section: Introduction: Light and Plantsmentioning

confidence: 99%

UV-B light and its application potential to reduce disease and pest incidence in crops

2021

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Ultraviolet-B radiation (280–315 nm), perceived by the plant photoreceptor UVR8, is a key environmental signal that influences plant growth and development and can reduce disease and pest incidence. The positive effect of UV-B on disease resistance and incidence in various plant species supports the implementation of supplemental UV-B radiation in sustainable crop production. However, despite many studies focusing on UV-B light, there is no consensus on the best mode of application. This review aims to analyze, evaluate, and organize the different application strategies of UV-B radiation in crop production with a focus on disease resistance. We summarize the physiological effects of UV-B light on plants and discuss how plants perceive and transduce UV-B light by the UVR8 photoreceptor as well as how this perception alters plant specialized metabolite production. Next, we bring together conclusions of various studies with respect to different UV-B application methods to improve plant resistance. In general, supplemental UV-B light has a positive effect on disease resistance in many plant–pathogen combinations, mainly through the induction of the production of specialized metabolites. However, many variables (UV-B light source, plant species, dose and intensity, timing during the day, duration, background light, etc.) make it difficult to compare and draw general conclusions. We compiled the information of recent studies on UV-B light applications, including e.g., details on the UV-B light source, experimental set-up, calculated UV-B light dose, intensity, and duration. This review provides practical insights and facilitates future research on UV-B radiation as a promising tool to reduce disease and pest incidence.

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Morphological and biochemical responses of broccoli florets to supplemental ultraviolet-B illumination

Cited by 11 publications

References 71 publications

Effects of plant age on performance of the tropical perennial fodder grass,Cenchrus ciliarisL. subjected to elevated ultraviolet‐B radiation

Effects of plant age on performance of the tropical perennial fodder grass,Cenchrus ciliarisL. subjected to elevated ultraviolet‐B radiation

Pre- and Post-harvest Factors Affecting Glucosinolate Content in Broccoli

UV-B light and its application potential to reduce disease and pest incidence in crops

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