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The papaya Arka Prabhath is an advanced generation gynodioecious cultivar developed at IIHR-Bengaluru. The seeds of this hybrid were treated with various doses (0 Gy, 50 Gy, 100 Gy, 250 Gy, 500 Gy and 750 Gy) of Gamma radiation to study the treatment influence on quality parameters viz., days to flowering, sex type, height to first flowering, trunk circumference, canopy spread, shelf life and yield. The radio sensitivity test on survival (%) among M₁ progenies showed that highest survival per cent was recorded in control treatment (82%) followed by 78% ( 50 Gy), 74% ( 100 Gy), 72 % (250 Gy) 28% ( 500 Gy)   and 0 % ( 750 Gy). The data on days to first flowering recorded among the M₁ progenies revealed significant differences among the treatments, which ranged from 0.00 to 132.00 days. Among the seeds germinated under various treatments, significantly lower number of days (120.00) was recorded in the treatment 500 Gy, which was on par with control recording (122.33 days). Sex type among mutagenic population did not show any significant difference; they segregated as females and hermaphrodites. The data shows number of nodes to first flowering revealed significant difference among the treatments. It was in the range of 0.00 to 7.91 between treatments. Height to first flowering ranged from 0.00 to 90.41cm, trunk circumference ranged from 0.0 to 31.79 cm, canopy spread ranged from 0.00 to 164 cm. The data on fruit yield showed significant difference among treatments, which ranged from 0.00 to 35.52 kg/tree.

Key words: Papaya, Gamma radiation, Yield, Genomics