Pomegranate trees quality under drought conditions using potassium silicate, nanosilver, and selenium spray with valorization of peels as fungicide extracts

Abstract

The current study was performed on 8 years old "Succary" pomegranate cultivar (Punica granatum L.) during the 2019 and 2020 seasons. One hundred pomegranate trees were chosen and sprayed three times at the beginning of flowering, full bloom, and 1 month later with the following treatments: water as control, 0.025, 0.05 and 0.1 mg/L Se; 5 mL/L, 7.5 and 10 mL/L Ag NPs, and 0.5, 1 and 2 mg/L K2Si2O5. The results showed that spraying of SE, Ag NPs, and K2Si2O5 ameliorated the shoot length, diameter, leaf chlorophyll content, set of fruiting percentage, and fruit yield per tree and hectare compared to control through studying seasons. Moreover, they improved the fruit weight, length, and diameter, as well as total soluble solids, total, reduced, and non-reduced sugars percent, while they lessened the juice acidity percentage compared to control. The most obvious results were noticed with Se at 0.1 mg/L, Ag NPs at 10 mL/L, and K2Si2O5 and K2Si2O5 in both experimental seasons over the other applied treatments. By HPLC analysis, peel extracts showed the presence of several bioactive compounds of catechol, syringic acid, p-coumaric acid, benzoic acid, caffeic acid, pyrogallol, gallic acid, ferulic acid, salicylic acid, cinnamic acid, and ellagic acid. The extracts applied to Melia azedarach wood showed promising antifungal activity against Rhizoctonia solani and were considered wood-biofingicides.

Effects of Pomegranate Peel Extract and/or Lactic Acid as Natural Preservatives on Physicochemical, Microbiological Properties, Antioxidant Activity, and Storage Stability of Khalal Barhi Date Fruits

“…Moreover, two flavonoids, namely rutin and apigenin, also appeared on the HPLC chromatogram of PPE with low concentrations. Our findings are in line with those obtained by Mosa et al [ 31 ], who reported that the main polyphenols in PPE include gallic acid, ellagic acid, quercetin, caffeic acid, p-coumaric acid, and vanillic acid. Fischer et al [ 32 ] investigated the polyphenols in pomegranate peels and they observed similar results but with different concentrations.…”

Influence of Selenium, Titanium, and Silicon Nanoparticles on the Growth, Yield, and Fruit Quality of Mango under Drought Conditions

“…Additionally, this treatment also improved the fruit weight, and length, along with increased the soluble solids as well as total, reduced, and non-reduced sugars in fruits. Simultaneously, it resulted in a reduction in juice acidity on opposite to not sprayed trees [81]. Additionally, the extern application of Se on blueberry at a complete flowering time and one month later, has been found to significantly enhance fruit quality, as well as the nutritional content of the trees [82].…”

Phytochemicals derived from Leucaena leucocephala (Lam.) de Wit (Fabaceae) biomass and their antimicrobial and antioxidant activities: HPLC analysis of extracts

“…Standard HPLC grade phenolic and flavonoid compounds (Fig. 3) including pyrogallol (1), quinol (2), gallic acid (3), catechol (4), p-hydroxybenzoic acid (5), chlorogenic acid (6), vanillic acid (7), caffeic acid (8), syringic acid (9), vanillin (10), p-coumaric acid (11), ferulic acid (12), benzoic acid (13), rutin (14), ellagic acid (15), o-coumaric acid ( 16), salicylic acid (17), resveratrol (18), cinnamic acid (19), myricetin (20), quercetin (21), rosmarinic acid (22), naringenin (23), and kaempferol (24) as well as caffeine (25), were used for the HPLC analysis. The detection was set at 284 nm to identify the existed compounds.…”

“…Botanical extracts have been observed to inhibit the mycelial growth and spore germination of some plant pathogenic fungi [15,16]. Promising antifungal activity against Rhizoctonia solani was observed as wood samples from Melia azedarach treated with pomegranate peel extracts, where the HPLC analysis showed the presence of phenolic acid compounds, syringic, p-coumaric, benzoic, caffeic, gallic, ferulic, salicylic, cinnamic, and ellagic as well as catechol and pyrogallol [17]. Olive leaf extract showed potential antimicrobial activity and compounds oleuropein, caffeic acid, luteolin 7-O-glucoside, rutin, apigenin 7-O-glucoside verbascoside, and luteolin 4'-O-glucoside were identified by HPLC/DAD [18].…”