roshan, a new released mutant aromatic rice variety with high yield and early maturity

Mutation breeding could be an efficient procedure for improvement of grain yield and quality characteristics in rice. a rice mutation breeding program was conducted at the genetics and agricultural biotechnology institute of tabarestan (gabit) research field during 2010-2018 using five varieties (sang tarom, tarom chaloci, nemat, khazar, and sepidrood). these varieties were treated with gama ray at 200 gray by the atomic energy organization of iran (aeoi). the mutated plants were evaluated for the agronomic characteristics in seven generations (m2-m9). eventually, eleven m9 pure promising lines were selected and evaluated for the agro-morphological and molecular as well as grain quality characteristics. the results showed that a line (m9-p10-37-1-1-1-1-1-1-1) derived from nemat variety has the desired characteristics of high yield (8.23 ton/ha) and early maturity (123.67 days). additionally, it possesses good physicochemical quality such as amylose content (ac=18.4%), gel consistency (gc=98 mm), gelatinization temperature (gt= 5.42), and aromatic scent confirming by fgr gene marker with 257bp length. the grain yield and quality test indicated that the line m9-p10-37-1-1-1-1-1-1-1 has 12.51% more yield compared shiroodi and 47.97% compared tarom hashemi, with a comparable quality. this line was registered as the ‘roshan’ variety.