جستجوی مقالات مرتبط با کلیدواژه « quercetin » در نشریات گروه « باغبانی »

Mangifera indica L. belongs to the Anacardiaceae family. The various organs of this plant, especially the leaves, contain valuable flavonoid compounds that are used in the treatment of diabetes. In the present study, to evaluate the amounts of rutin and quercetin in the leaves of different M. indica genotypes in the habitats of southern Iran, four major habitats including Manoojan and Roodan from Kerman province, Minab from Hormozgan province, and Bushehr port from Bushehr province were selected. From each habitat, 10 mature and healthy trees were selected and from each tree, three groups of leaf samples were taken from a height of two meters. Extraction of dried mango leaves was performed by methanol-acetic acid solvent and injected into HPLC for analysis. The amounts of rutin and quercetin in 40 samples of M. indica extracts were determined. Data were analyzed in a completely randomized design using SPSS statistical software and cluster analysis was performed by Ward method to group the populations and genotypes. There was a statistically significant difference (P <0.05) between the four M. indica populations in terms of both rutin and quercetin. The highest levels of rutin and quercetin were obtained in Manoujan (124.03 ppm) and Bushehr (6.05 ppm) populations, respectively. Cluster analysis divided the four populations into three independent groups: populations Rudan and Minab in group 1, Bushehr in group 2, and Manoujan in group 3. Evaluation of phytochemical diversity can provide valuable information in the management of M. indica germplasm and be useful in identifying suitable populations for different breeding purposes in this species.

Calendula officinalis L. belongs to Asteraceae and is an ornamental and medicinal plant. Since diagnosis of medicinal plants growth under different irrigation conditions and drought stress can be a guide for growing plants in dry and low water conditions, the aim of this study was investigating of the effects of drought stress on morphological characteristics and quercetin amount, in different stages of plant growth of C. officinalis L. This research was conducted in Gorgan in a completely randomized factorial design, each treatment with 3 replications. The experimental treatments included three levels of stress (no stress, mild stress and severe stress) in pots under greenhouse conditions, at vegetative, pre-flowering, flowering, and fruiting stages. After determining the soil field capacity in the pots, the water content was calculated for control pots, and then its content was set at 2/3 for mild and 1/3 for drought stress. The pots were irrigated with the specified amount. After the treatments, plants were pulled from soil and their morphological traits including plant height, root length, stem length, leaf length, number of flowers, and flower diameter were measured. Moreover, their predominant flavonoid production (quercetin) was measured by liquid chromatography. Statistical analysis was performed SPSS software and means were compared using Duncan's multiple range test at 5% level. The results showed decreased plant height, leaf number and area and flower number and diameter, and increased root length by decreasing of soil moisture content at all stages of growth. The amount of quercetin increased in mild stress condition and decreased in severe stress condition at flowering and fruiting stages. The highest level of quercetin (59.11 mg g-1 dry weight) was belonged to mild drought stress at fruiting stage and the lowest level (41.05 mg g-1 dry weight) was belonged to severe drought stress at flowering stage. It can be concluded that plants produce more secondary metabolites in response to stress, and in severe stress, they produce fewer secondary metabolites due to lower plant growth rate.

Quinces use as bearing fruit tree and also have numerous medicinal effects, such as high contents of antioxidants including phenols and flavonoids. Due to importance of flavonoids in the physiological and medicinal aspects of this tree, the current research was conducted to investigate the variations of flavonoids in the leaves and fruits of quince genotypes from northern regions of Iran, comparing them with cultivar Esfahan as control. So, it was followed by using 24 genotypes including ARD1-7, Beh Amroudi, Beh Sibi, Beh Givi Kowsar from Ardebil province, LA1 and LA3 from Tehran provinces, M1, M2, M3, M4, M8 and M9 from Khorasan and AS1, ASM1, ASM2, ASM3, ASP1 and ASP2 from Guilan province. The results showed significant differences in the total flavonoids in the leaves and fruits of the quinces. According to the results, M3 and LA1 genotypes respectively had the highest and lowest total levels of the flavonoids in their leaves with 21.9 and 3.1 mg QE/g values, compared with the control cultivar containing 13.4 mg QE/g. Also the results of the flavonoid contents of the fruits indicated the highest level in control cultivar, Esfahan with 6.2 mg QE/g, while all other genotypes had significantly lower levels of flavonoids. Also evaluation the effects of sampling period on the variation of total contents of the leaf flavonoids showed that the highest concentration of these compounds belonged to the beginning of the summer, while the leaves had lower levels of flavonoids at other sampling periods.