The role of quercetin in plants

Singh, Priyanka; Arif, Yamshi; Bajguz, Andrzej; Hayat, Shamsul

doi:10.1016/j.plaphy.2021.05.023

Cited by 277 publications

(181 citation statements)

References 139 publications

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“…In plant tissues, quercetin facilitates several physiological processes such as seed germination, pollen growth, photosynthesis, plant growth, and development [30]. It is found in several edible vegetables as onion, asparagus, and berries.…”

Section: Polyphenolsmentioning

confidence: 99%

Natural Polyphenols as Immunomodulators to Rescue Immune Response Homeostasis: Quercetin as a Research Model against Severe COVID-19

Bernini

Velotti

2021

Molecules

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The COVID-19 pandemic is caused by SARS-CoV-2 and is leading to the worst health crisis of this century. It emerged in China during late 2019 and rapidly spread all over the world, producing a broad spectrum of clinical disease severity, ranging from asymptomatic infection to death (4.3 million victims so far). Consequently, the scientific research is devoted to investigating the mechanisms of COVID-19 pathogenesis to both identify specific therapeutic drugs and develop vaccines. Although immunological mechanisms driving COVID-19 pathogenesis are still largely unknown, new understanding has emerged about the innate and adaptive immune responses elicited in SARS-CoV-2 infection, which are mainly focused on the dysregulated inflammatory response in severe COVID-19. Polyphenols are naturally occurring products with immunomodulatory activity, playing a relevant role in reducing inflammation and preventing the onset of serious chronic diseases. Mainly based on data collected before the appearance of SARS-CoV-2, polyphenols have been recently suggested as promising agents to fight COVID-19, and some clinical trials have already been approved with polyphenols to treat COVID-19. The aim of this review is to analyze and discuss the in vitro and in vivo research on the immunomodulatory activity of quercetin as a research model of polyphenols, focusing on research that addresses issues related to the dysregulated immune response in severe COVID-19. From this analysis, it emerges that although encouraging data are present, they are still insufficient to recommend polyphenols as potential immunomodulatory agents against COVID-19.

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Section: Polyphenolsmentioning

confidence: 99%

Natural Polyphenols as Immunomodulators to Rescue Immune Response Homeostasis: Quercetin as a Research Model against Severe COVID-19

Bernini

Velotti

2021

Molecules

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“…Quercetin (3,3 ,4 , 5,7-pentahydroxyflavone) is one of the most abundant flavonoids among plants belonging to the class of flavonols. Quercetin, classified as a phenolic compound, has a strong antioxidant effect as it helps maintain oxidative balance [14]. This flavonoid is located in the chloroplast envelope, probably in the outer envelope membrane [10].…”

Section: Introductionmentioning

confidence: 99%

“…However, they have a significant impact on the natural environment and human health. Therefore, more and more emphasis has being placed on the use of safe agents-biostimulants, which could contain flavonoids-including quercetin [14,21]. However, despite the large number of publications on the impact of external application of phenolic substances on the physiological processes occurring in plants [22][23][24], information about it in wheat seedlings is insufficient [25].…”

Section: Introductionmentioning

confidence: 99%

The Effect of Exogenous Application of Quercetin Derivative Solutions on the Course of Physiological and Biochemical Processes in Wheat Seedlings

Jańczak-Pieniążek

Migut

Piechowiak

et al. 2021

IJMS

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Quercetin, classified as a flavonoid, is a strong antioxidant that plays a significant role in the regulation of physiological processes in plants, which is particularly important in the case of biotic and abiotic stresses. The study investigated the effect of the use of potassium quercetin solutions in various concentrations (0.5%, 1.0%, 3.0% and 5.0%) on the physiological and biochemical properties of wheat seedlings. A pot experiment was carried out in order to determine the most beneficial dose of this flavonoid acting as a bio-stimulant for wheat plants. Spraying with quercetin derivative solutions was performed twice, and physiological measurements (chlorophyll content and fluorescence as well as gas exchange) were carried out on the first and seventh days after each application. The total phenolic compounds content and the total antioxidant capacity were also determined. It was shown that the concentrations of potassium quercetin applied have a stimulating effect on the course of physiological processes. In the case of most of the tested physiological parameters (chlorophyll content and fluorescence and gas exchange) and the total antioxidant capacity, no significant differences were observed in their increase as a result of application with concentrations of 3.0 and 5.0%. Therefore, the beneficial effect of quercetin on the analysed parameters is already observed when spraying with a concentration of 3.0%.

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“…Quercetin (3.3′,4′,5.7-pentahydroxyflavone) belongs to a group of flavonoids found mainly in the form of glycosides in plants [ 27 ]. Its most important functions are to ensure plant–environment communication and protect plants, mainly through antioxidant activity, i.e., protection photosynthetic machinery against oxidative stress, which can damage the cell’s DNA [ 28 , 29 ]. Moreover, quercetin can chelate transitive metal ions responsible for the production of ROS [ 30 , 31 , 32 ].…”

Section: Introductionmentioning

confidence: 99%

Physiological Response of Maize Plants (Zea mays L.) to the Use of the Potassium Quercetin Derivative

Migut

Jańczak-Pieniążek

Piechowiak

et al. 2021

IJMS

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Plant production technologies based solely on the improvement of plants themselves face obstacles resulting from the natural limitations of the biological potential of varieties. Therefore, new substances are sought that positively influence the growth and development of plants and increase resistance to various biotic and abiotic stresses, which also translates into an increase in obtained yields. The exogenous application of various phytoprotectants shows great promise in terms of cost effectiveness compared to traditional breeding methods or transgenic approaches in relation to increasing plant tolerance to abiotic stresses. Quercetin is a strong antioxidant among phenolic compounds, and it plays a physiological and biochemical role in plants. As such, the aim of this research was to assess the effect of an aqueous solution of a quercetin derivative with potassium, applied in various concentrations (0.5%, 1.0%, 3.0% and 5.0%), on the efficiency of the photosynthetic apparatus and biochemical properties of maize. Among the tested variants, compared to the control, the most stimulating effect on the course of physiological processes (PN, gs, ci, CCI, Fv/Fm, Fv/F0, PI) in maize leaves was found in 3.0 and 5.0% aqueous solutions of the quercetin derivative. The highest total antioxidant capacity and total content of polyphenolic compounds were found for plants sprayed with 5.0% quercetin derivative solution; therefore, in this study, the optimal concentration could not be clearly selected.

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The role of quercetin in plants

Cited by 277 publications

References 139 publications

Natural Polyphenols as Immunomodulators to Rescue Immune Response Homeostasis: Quercetin as a Research Model against Severe COVID-19

Natural Polyphenols as Immunomodulators to Rescue Immune Response Homeostasis: Quercetin as a Research Model against Severe COVID-19

The Effect of Exogenous Application of Quercetin Derivative Solutions on the Course of Physiological and Biochemical Processes in Wheat Seedlings

Physiological Response of Maize Plants (Zea mays L.) to the Use of the Potassium Quercetin Derivative

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