Seeds of the sunflower variety 'Surya' were irradiated with 4 doses of gamma rays. Effects of gamma rays on the induction of plant injury and morphological mutations were studied. Increasing doses of gamma rays increased the plant injury in the M1 generation. Two sectorial male sterile chimera were found in the M1 generation. In the M2 generation, 27 morphological mutants were isolated. Among them, 3 each were for chlorophyll and stem, 9 for leaf, 8 for capitulum and 4 for seed coat colour. Some of the mutants possessed more than one mutated character. Mutations like yellow leaf vein, fasciation, wrinkled leaf, zigzag stem, zigzag ray florets, stigma emergence and brown patch mutants are novel characteristics. Among the 4 doses of gamma rays, 200 Gy was the most effective dose for induction of mutation in sunflower.