BACKGROUND The genus Rosa comprises economically important horticultural plants belonging to the family Rosaceae. Recently, the use of different Rosa species has increased owing to their multipurpose properties (ornamental, food and medicinal uses). In this study, 21 accessions of Rosa genotypes were compared for fruit phytochemical composition and color parameters. RESULTS The highest antioxidant activity (37.86 mg AAE g−1 FW) and total phenolic (8.17 mg GAE g−1 FW), total flavonoid (2.53 mg QUE g−1 FW), total carotenoid (20.21 mg g−1 FW) and ascorbic acid (84.27 mg g−1 FW) contents were observed in G20 (R. canina), G8 (R. canina), G9 (R. canina), G5 (R. damascena) and G10 (R. moschata) respectively. Chlorogenic acid and gallic acid were found as the main phenolic constituents of Rosa fruits. High amounts of apigenin, rutin, quercetin, p‐coumaric acid, cinnamic acid, chlorogenic acid, caffeic acid and gallic acid were obtained in fruit extracts of G6, G14, G6, G8, G19, G9, G19 and G12 respectively. Moreover, the level of color parameters also varied among genotypes. The highest values of a*, b*, L* and chroma were obtained in G4 (R. canina). Based on hierarchical clustering analysis with heat‐map, five groups of accessions were identified. CONCLUSION Different Rosa genotypes are rich in certain phytochemical compounds, with significant variations in their levels being observed. Hence evaluation of Rosa genetic resources can supply valuable data for screening accessions containing high levels of individual phenolics, antioxidants and other bioactive compounds for use in breeding programs and food and pharma industries. © 2019 Society of Chemical Industry

The petals of species are used in the food industry and various traditional medicinal products, but few studies exist on the phytochemical composition and antioxidant activity of petals of L. species grown in Iran. Phytochemical characteristics and antioxidant activity and some phenolic compounds of petals of six L. species were studied. Total phenolic content, total flavonoid content, and antioxidant activity were determined using Folin-Ciocalteu reagent, aluminum chloride method, ferric-reducing antioxidant power (FRAP), and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assays, respectively. An HPLC system was used for quantitative analysis of phytochemical compounds. Hierarchical cluster analysis (HCA) and principal component analysis (PCA) were performed among the variables analyzed using Minitab software. Also, heat maps were used to visualize phytochemical characteristics and antioxidant activity in each species using GraphPad Prism software. The amount of total phenol content, total flavonoid content, and antioxidant activity were in the range of 25.13-52.01 mg gallic acid equivalents/g dry weight (DW), 0.61-0.82 mg quercetin equivalents/g DW, 11.47-20.93 µmol Fe/g DW (FRAP), and 31.66-74.44% (DPPH), respectively. The p-coumaric acid (647.28 μg/g DW) and chlorogenic acid (24.37-135.23 μg/g DW) were found to be the most abundant phenolic compounds in the extracts of rose petals. The HCA and PCA revealed three distinct categories of species based on phytochemical composition and antioxidant activity. These results showed that phytochemical characteristics of different rose species widely correlated with species type and are promising sources of natural antioxidants beneficial for use in the food or pharmaceutical industries. Iran is one of the main centers for genetic diversity of L. The petals of species are used in the food industry and various traditional medicinal products, but few studies exist on the phytochemical composition and antioxidant activity of petals of L. species grown in Iran. Antioxidant activity and phytochemical compound of Six L. species petals grown in Iran were studied. Phenolic compounds in petals of were analyzed by HPLC. The color parameters, amount of total phenolic, total flavonoids, antioxidant activity and some individual phenolic compounds were significantly variable amongst species.

No abstract

No abstract