Phenolic compounds and antimicrobial properties of Begonia grandis Dryand. subsp. grandis leaves

Abstract

We studied the leaves of Begonia grandis Dryand. subsp. grandis, the northernmost and most cold-resistant representative of the predominantly tropical genus Begonia, by histochemical methods. In glandular and nonglandular trichomes as well as in the epidermal cells of B. grandis Dryand. subsp. grandis leaves, phenolic compounds, including flavonoids, as well as terpenoids and carbonyl compounds were detected. The patterns of phenolic compounds in the acetone and ethanol leaf exudates and in leaves as a whole were similar and contained oxalic, citric, and gallic acids, isoquercitrin, and orientin. Concentrations of phenolic compounds in the acetone and ethanol exudates constituted 0.10 % and 2.59 % of all phenolic compounds in the leaves, respectively. Antimicrobial effects of the aqueous ethanol extract and of the ethanol exudate against reference strains of Bacillus subtilis, Staphylococcus aureus, and Candida albicans were detected at the disc con tents of 50.0 and 45.8 μg, respectively. The observed set of characteristics can be used in a targeted search for highly antimicrobial species of Begoniaceaе.

Phenolic compounds in strawberry (Fragaria x ananassa Duch.) microshoots

“…Under open field conditions, the adaptation is achieved by quercetin derivatives and phenolic acids, during in vitro proliferation, it realized by hydroxybenzoic acids and ellagic acid derivatives, and during in vitro rooting, it is implemented with hydroxycinnamic acids. Similar accumulation of quercetin glycosides in field-grown plants and their absence in greenhouse plants was noted previously [3]. The protective effect of hydroxycinnamic acids associated with changes in the activity of antioxidant system enzymes under stress has also been shown [9,10].…”

“…These in vitro factors interfere the successful acclimatization of plants under non-sterile conditions. In this regard, it is of interest to expand the spectrum of biochemical indicators of the adaptive status of strawberry plants with secondary metabolites, including phenolic compounds, which can often serve as indicators of stress and adaptation [3]. The сomposition of phenolic compounds of F. × ananassa leaves was studied fragmentarily.…”

Morphological diversity and phenetic relationship of wild and cultivated Begonia based on morphology and leaf venation

“…The use of Begonia as a medicinal plant is due to the content of secondary metabolites (Suresh et al 2016). In this regard, Karpova et al (2019) noted that secondary metabolites in Begonia could be found in glandular trichomes and leaf epidermal cells such as those in B. grandis subsp. grandis.…”

Leaf pigments and concentrations of phenolic compound in Begonia grandis plantlets obtained from the floral explants

“…At the same time, permanently high anthocyanin concentration improves adaptation to the environment, including in vitro conditions (Wang et al 2016). The chromatographic profile of B. grandis incorporates organic acids (oxalic, ascorbic and citric acids), phenolic acids, C-glycosyl flavones (including orientin and isovitexin), flavonol O-glycosides (mainly hyperoside, isoquercitrin and astragalin), and aglycones quercetin and luteolin (Karpova et al , 2019. Diversity of secondary metabolites of B. grandis is the basis of antioxidant, antimicrobial and anti-inflammatory effects (Laferriere 1992;Karpova et al 2019;Pendy et al 2020).…”