Introducing the new drought-resistant encore variety "Siyadan"

Among the various grape cultivars, some possess desirable fruit qualities that, due to their high quality, attract the attention of growers for uses such as fresh consumption, raisin production, and processing. Consequently, the cultivation area of these cultivars has been increasing steadily. In contrast, cultivars with less desirable fruit have lost their significance and are often overlooked. However, these seemingly less desirable cultivars may harbor valuable genetic traits, such as resistance to pests, diseases, cold, salinity, drought, and similar stresses. Identifying these cultivars is particularly important for addressing challenges posed by climate change, including drought, increased heat, and spring frost.
To identify, select, and evaluate drought-resistant grape genotypes in Qazvin Province, a project was initiated in the spring of 2002. This project began with a comprehensive survey of vineyards in the region and indirect selection and screening of drought-tolerant cultivars based on morphological traits. Initially, all grape genotypes in Qazvin Province were examined for traits compatible with drought stress. After identifying superior cultivars, cuttings were prepared and planted in a primary field. The local commercial cultivar, White Seedless, was used as a control. Drought stress treatments were applied, eventually leading to the introduction of a new cultivar named Siaden, recognized as drought-resistant and suitable for fresh consumption. This cultivar features characteristics such as round black berries, suitability for fresh consumption, early ripening as unripe grapes, and excellent market potential.