Effect of Different Chemical Mutagens on Tarrom Mahali Rice Cultivar

Mutation induction has been accepted as a useful tool in plant breeding programs to provide maximum inheritable variability. In present study، role of three chemical mutagens [Ethyl Methan solfonate (140 mM)، Sodium Azide (2 mM) and a combination treatment of Methyl Nitros ourea+ Sodium Azide (30 mM+2 mM)] for creating variability in Tarrom Mahali cultivar have been investigated. The measured agronomic characters were: Plant height، tiller number، length and width of flag leaf، panicle length، number of first and second spikelet، number of unfilled، filled and total seeds per panicle. Results indicated that plant height and number of total seed per panicle showed the best response to this mutagens because plant height decreased significantly in all mutagen treatments compared with control. Number of total seed per panicle increased significantly in all mutagen treatments compared with control. Plant height in three mutagen treatments showed the most heritability and genetic advance. Maximum heritability and genetic advances were belong to combination treatment MNU+AZ in most traits، therefore، it is indicated that effects of this mutagen is higher than the other two mutagens.