Rice is the second cereal which is widely consumed in the country. Therefore, improving this crop for increasing its yield along with maintaining its quality is of great importance. One of the methods to improve breeding plants is using physical mutagens such as ionizing rays. Due to the low yield and lodging of local varieties of the country that have desirable marketing characteristics, a project was carried out in the Nuclear Sciences and Technology Research Institute to produce high yielding varieties with desirable quality through gamma radiation induced mutation.
In this project first, the two local varieties of Tarom and Mousa Tarom were irradiated by gamma ray in various doses. After determination of optimized doze in lab conditions, the related population of both varieties were irradiated with the optimized doze and the irradiated seeds were cultivated in the farm. Plants with high yield and desirable characteristics were selected in each breeding year. The selected plants were cultivated in several zones in order to evaluate their performance and two high yielding lines with desirable quality were chosen among them and were registered accordingly as new varieties through the cooperation of the Ministry of Agricultural Jihad.
In this project, by using the mutation-induced breeding technique, two mutant rice varieties of Pouya and Tabesh were introduced and registered as cultivars with high quality and quantity characteristics such as dwarfness, resistance to lodging, tolerance to blast disease, desirable marketability and high performance.