جستجوی مقالات مرتبط با کلیدواژه « phenol content » در نشریات گروه « زراعت »

Numerous studies have been performed on the effect of rootstock and cultivar on physicochemical traits of apple fruit with their results showing different effects of these two factors. In order to study three vegetative rootstocks on some quantitative and qualitative characteristics of apple cultivars "Golden Delicious" and "Red Delicious", an experiment was carried out in factorial design based on randomized complete blocks with four replications in orchard of Mashhad Agricultural Research Center in 2021. Fruit quantitative and qualitative characteristics, including weight, volume, density, length, diameter, firmness, pH, total soluble solids, phenol content, antioxidant properties and anthocyanin have been measured. The highest amount of total phenol (652.9 μg.g-1FW) and anthocyanin (35.9 mg.g-1FW) has been measured in "Red delicious" on M9 rootstock. The results of this study show that "Red delicious" has had the highest amount of diameter (78/64 mm) and weight (166/9 g). The highest amount of fruit firmness has been observed in M9 rootstock (5/64 kgcm-3). In general, the results of this study indicate a different effect of rootstock and cultivar interaction on the studied characteristics. Depending on the purpose of gardener, different grafting compounds can be recommended "Red delicious" on M9 and MM106  rootstock with highest amount of total phenol and anthocyanin is suggested as a valuable grafting compounds in terms of health benefits under Mashhad Climatic Conditions.

In recent years, studies have focused on the use of new compounds that can be synthesized inside the plant and increase the photosynthetic efficiency of the plant. Some of these compounds include micronutrients and alcohols. Alcohols such as methanol as a carbon source will increase photosynthetic efficiency and improve plant growth parameters. Titanium dioxide nanoparticles also improve and repair the photosynthetic apparatus in the plant and thus increase the photosynthetic efficiency. For this reason, this study investigates methanol and titanium dioxide nanoparticles on the phytochemical properties of artichoke.

In order to investigate the foliar application of methanol and titanium dioxide (TiO2) nanoparticles on artichoke, an experimental factorial design based on randomized complete blocks with 4 levels for each of the 2 methanol factors (0, 15, 30 and 45% by volume) and Anatase of titanium dioxide (0, 20, 40 and 60 mg. l-1) was performed in 3 replications in 2019 and 2020. Measured traits included photosynthetic pigments, phenol, flavonoids and antioxidant activity over two years.

Based on the results, the interaction of treatments for all studied traits in both years of the study was statistically significant at the level of 1%. The highest amount of chlorophyll a, b and whole leaves in the first year of zero volume treatment of methanol + 20 mg.l-1 titanium dioxide nanoparticles and in the second year of leaves from 45% volume treatment of methanol + 40 mg.l-1 titanium dioxide nanoparticles was obtained. In the first year, 30% volumetric treatment of methanol + zero mg.l-1 titanium dioxide nanoparticles and in the second year, 15% volumetric treatment of methanol + zero mg.l-1 titanium dioxide nanoparticles with 218.75 and 192.85% increase, respectively, compared to control had the highest carotenoid levels. The highest amount of first year leaf flavonoids was observed in zero volume treatment of methanol + 20 mg.l-1 titanium dioxide nanoparticles which was not significantly different from zero volume methanol + 60 mg.l-1 titanium dioxide nanoparticles. The highest amount of flavonoid in the second year leaves was obtained from the treatment of 45% by volume of methanol + 40 mg.l-1 titanium dioxide nanoparticles with 284.61% increase in control ratio. The highest amount of first year leaf phenol from the interaction of 15% volumetric methanol + 20 mg.l-1 titanium dioxide nanoparticles The highest amount of second year leaf phenol from the interaction of 45% volumetric methanol + 20 mg.l-1 titanium dioxide nanoparticles, respectively with 73.15 and 216.91% increase in control ratio were seen. The highest amount of antioxidant activity in the first year was zero volume methanol + 20 mg.l-1 titanium dioxide nanoparticles and 30% methanol + zero mg.l-1 titanium dioxide nanoparticles with 32.16% increase compared to the control Allocated. In the second year, the treatment of 45% by volume of methanol + 40 mg.l-1 titanium dioxide nanoparticles with the highest increase of 16.24% compared to the control had the highest free radical scavenging power.

According to the results, the combined use of methanol as a carbon source and nanoparticles of titanium dioxide can be useful in improving the phytochemical properties of artichoke.

The effects of hexanal and Pelargonium. essential oil (PEO)-Cucurbita pepo oil (CPO) on the quality and storability of grape cv. Bidaneh Sefid during cold storage was investigated. The treatments included 1) controls as untreated fruuits, 2) Wet controls (treated fruits with solvent (0.02% 0f Ethanol) that was used in preparation of treatments), 3) hexanal, 4) EFF and 5) combination of PEO and CPO. After treatments, the fruits were stored at 0 ± 1° C and 65-60% RH. At the beginning of the storage, and every 15 days, some parameters were evaluated. The results showed that none of treatments had not significant effect on titratable acidity, pH, total phenol content and fruit quality. The lowest increase in soluble solids (35.59 %) was observed in EFF treatment, which had a significant difference with control untreated fruits. Control fruits with the highest rate of rot (3.5 score) and weight loss (9.3 %) and the lowest firmness (201.3 N mm-2) had less quality than other treated fruits. Hexanal treatment was more successful in maintaining color indices a* and L* in comparison with other treatments. In general, the most effective treatment in preservation postharvest attributes of grape was EFF treatment with significant effects in reducing weight loss, activity of the polyphenol oxidase enzyme, fruits rot and color change of rakis, which seems that good synergistic effects of hexanal treatment, PEO and CPO has maintained quality of grapevine fruits cv. Bidaneh Sefid during 2 months of storage.

This experiment was conducted with three transplanting dates (April 9, May 9 and June 8 2013) and three plant population densities (7, 10 and 16 plant/m2) which considered as main and subplots, respectively. Results showed a relative compensatory effect of higher population density until 10 plants/m2, albeit delayed planting resulted to decrease in total shoot, leaf (L) and stem (S) dry weights. It represents that the highest flower dry weight (F) (27.1 g/plant) was related to planting on May 9 with 10 plant/m2 density. Ratio of L/shoot was greater than S/Shoot than F/shoot. The highest (L)/Shoot ratio was related to the April and May planting dates while the highest S/Shoot ratio was related June’s planting date. Maximum total phenol content of leaves (51.1 mg of GAE/ g dry matter) and stems (35.9 mg of GAE/ g dry matter) were measured in plants cultivated on April 9 with a density of 10 plant/m2. The highest total phenolic content of flowers (56.5 mg of GAE/ g dry matter) was determined in plants cultivated on May 9 with a density of 10 plant/m2.Total phenol of flowers was greater than leaves than stems. Overall, it could be concluded that early planting of purple coneflower on April 9 with 10 plant/m2 density is apparently suitable for leaf and stem dry weight and total phenol production while delayed planting until May 9 with a population density of 10 plant/m2 is favorite for flower based production of dry weight and total phenol, according to the experiment conditions.