Improvement of quality, such as seedlessness of fruits, is another desired character, which may be investigated as it is one of the easiest changes usually observed in mutation breeding programmes. Various physical mutagens such as X-ray, 60Co produced gamma ray, fast neutrons, laser beam, electron beam and ion beam etc, have been used in mutation breeding of horticultural crops. Gamma rays produced by 60Co source are currently mostly used and appears more effective than other mutagens in the efficiency of mutation induction [2].