تاثیر تنش غرقاب کامل در مرحله دو برگی بر رشد گیاهچه برنج در شرایط گلخانه

In order to investigate the effect of complete submergence on seedling growth of five rice cultivars in transplanting boxes, a greenhouse experiment was carried out in the Deputy of Rice Research Institute of Iran (Amol). A split plot experiment was conducted in a complete randomized design with two factors of cultivar and duration of complete submergence. Flooding periods with zero, 12, 24 and 48 hours were considered as the main plot and cultivars of Shirudi, Tarom Mahali, Fajr, Kouhsar and Keshvari as the sub plots. After treatment, seedling growth traits of rice, such as seedling height, root length, leaf area, dry weight of leaves, stems, roots, seeds, total dry weight and entire volume of roots and shoots, root -shoot ratio ​​were measured. The results showed that the effect of variety, duration of submergence and their interaction are significant at 1%. Kouhsar variety had higher seedling height, roots volume, leaf area and total dry weight than Shirudi, Tarom Mahali, Fajr, and Keshvari varieties. With the increase of submergence duration, seedling height, roots volume and root -shoot ratio also increased, but seeds and total dry weights decreased. The reaction of rice cultivars related to submergence was different.