Vol. 9, Issue 2, Part H (2025)

The present investigation was carried out in the experimental field of College of Agriculture, Central Agricultural University, Imphal during rabi 2019-20 and rabi 2020-21. Seeds of Indian mustard genotypes CAULC-2 (local cultivar) and NRCHB-101 were exposed to three doses of gamma rays (1000Gy, 1100Gy and 1200Gy), three concentrations of ethyl methanesulphonate (0.3, 0.5 and 0.7%) and in various combinations (1000Gy + 0.5%, 1100Gy + 0.5% and 1200Gy + 0.5%). Different types of morphological mutations affecting plant growth habit, plant height, maturity, foliage, seed and siliqua characteristics were isolated. In general, maximum frequency of morphological mutants was observed in combination treatment of gamma ray and EMS in both the genotypes CAULC-2 and NRCHB-101. For the genotype CAULC-2, the trend of induction of morphological mutations was in the order of combination treatment > gamma rays > EMS, whereas for the genotype NRCHB-101, it was combination treatment > EMS > gamma rays. The genotypes used in the study showed differential response with regard to viable mutations with NRCHB-101 being more sensitive for the production of viable mutants.