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• Coriandrum sativum L. leaves and seeds have been used for medicinal purposes in Iran. • Beet curly top virus reduced plant biomass in the leaf stage, and flowering stem did not form in the infected plant. • Vitamin C, total phenol, flavonoid, protein, and proline decreased under virus infection. • Change in aroma and phytochemical properties of coriander leaves probably will affect their reported biological activity. Leaves and seeds of coriander (Coriandrum sativum L.) are edible and have been used for culinary and medicinal purposes. The present study was conducted to investigate the effect of the beet curly top virus-sever on the physical and chemical properties of coriander leaves. Plants were inoculated at the three-five leaf stage with the infectious clone of the virus, and for mock inoculation, plants were treated with Agrobacterium tumefaciens containing binary vectors without virus sequence. Infected plants had a reduction in height (35 %) and in fresh and dry mass (21 and 30 %) respectively. In addition, in plants with high infestation intensity, flowering stems did not form, and seed production stopped completely. The total content of flavonoids, phenolic, and vitamin C decreased in the leaves of infected plants. The essential oil content did not significantly differ between the two treatments. Analysis of GC and GC–MS showed that the production of alcoholic compounds (33.02–36.03 %) and estragole (11.35–13.27 %) as a phenyl propene compound were reduced in essential oils of infected plants, but terpenoids (3.5–2.13 %) and aldehydes (35.9–40.68 %) were increased in their essential oils. n -tetradecanol, 2 E -dodecenal, estragole, 2 E -decenal, decanal, dodecanal, tetradecanal, and 2 E -decenyl acetate were the main identified essential oil compound in both treatments. Virus infection changed the quality and quantity of chemical compounds; therefore, it is probable that the medicinal and culinary quality of coriander would be affected. Due to these chemical changes and, more importantly, the severe reduction in seed production of infected plants, it is recommended to investigate and evaluate the resistance of commercial cultivars and domestic coriander genotypes to the virus. [ABSTRACT FROM AUTHOR]

• Three independent experiments on peach and nectarine cultivars and genotypes in Iran showed significant variations in growth, yield, and biochemical behaviors. • 'Henri' was found to have superior yield, tissue firmness, and total soluble solids. • Specific cultivars were found to have higher yield efficiency and nutrient levels compared to control cultivars, and the study recommends 'Flamino', 'Nectared', and 'Henri' as the best nectarine cultivars and 'Shasta', 'Sorkho-Sefid Mashhad', 'Suncrest', 'Fayette', and 'Shandabad-Hasteh-Joda' peaches as superior cultivars for specific locations. • These findings emphasize the importance of selecting appropriate cultivars for optimal growth and yield and continued research in stone fruit breeding. Stone fruit breeders face a significant challenge in obtaining new and high-yielding cultivars, and utilizing unknown ones. Among stone fruit, peaches and nectarines are the most prominent fruits. To address this issue, three independent experiments were conducted on various peach and nectarine cultivars and genotypes at two locations in Iran during 2018–2019 and 2019–2020 using a randomized complete block design with three replications. The results showed significant variations in growth, yield, and biochemical behaviors among the different genotypes and cultivars. 'Henri' was found to have superior yield, tissue firmness, and total soluble solids. Additionally, certain peach cultivars, such as 'Fayette', 'Sorkho-Sefid-Mashhad', and 'Shandabad', had higher yield efficiency than the control cultivar 'J.H. Hale'. Furthermore, 'PMsh-5′ had higher levels of ascorbic acid, antioxidant capacity, and carotenoids. 'Haj-Kazemi' had the tallest average tree height, trunk diameter, and crown of the tree in Golmakan, while 'Anjiri-Zaferani' had the highest levels of total soluble solids, flavor index, and pH. Based on these findings, 'Flamino', 'Nectared', and 'Henri' are recommended as the best nectarine cultivars in Mashhad due to their high pomological and phenological traits. 'Shasta', 'Sorkho-Sefid Mashhad', and 'Suncrest', as well as 'Fayette' and 'Shandabad-Hasteh-Joda' peaches, are recommended as superior cultivars for Mashhad and Golmakan, respectively. This study highlights the importance of selecting appropriate cultivars for optimal growth and yield and emphasizes the need for further research in stone fruit breeding. [ABSTRACT FROM AUTHOR]