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This experiment was carried out using the gynodioecious cultivar like Arka Prabhath. It is an advanced generation hybrid derivative from the cross of (Arka Surya x Tainung-1) x Local Dwarf has released from ICAR- IIHR.. It is gynodioecious in nature, with large sized fruits of 900-1200 g and smooth skin. The pulp is an attractive deep pink colour with good keeping quality and high TSS (13-14˚B). 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 impact on qualitative and quantitative traits viz., days to flowering, sex type, and height to first flowering, trunk circumference, canopy spread, shelf life and yield. M₁ populations of papaya were selected and forwarded to M₂ and assigned into families (A to Y). The X family (153 days) and D family (152.6 days) takes longer days to first flowering where as J family (146 days) and K family (146.4 days) takes shorter days to first flower. Significantly superior trunk circumference (33.90 cm) was observed in the A family and M family (32.80 cm). The highest canopy spread (E-W) was observed in C family (143.33 cm) and G family (140.50 cm). The highest yield was observed in G family (57.90 kg/pt) and M family (36.40 kg/pt) whereas lowest yield records in J family (15.90 kg/pt) and P family (16.78 kg/pt).

Key words: Gamma irradiation, TILLING, Carica Papaya