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To elucidate the potential and sensitivity of γ-irradiation in Pongamia pinnata, the present study has been done by irradiating the air-dried seeds to different γ-irra-diation doses (100 Gy, 200 Gy, 400 Gy and 600 Gy), using 60Co source. Significant increase (p ≤ 0.05) in the germination, growth, and vigor was recorded under the 100 Gy treatment than the control set. The chlorophylla and total chlorophyll content (mg g-1 FW) in the leaves of P. pinnata showed a significant decrease under the higher irradiation treatments (200 Gy, 400 Gy and 600 Gy). In contrast, chlorophyllb showed a radio-resistance up to 200 Gy dose, and above which its concentration declined significantly (p ≤ 0.05). Photosynthetic rate, stomatal conductance, intercellular CO2 concentration, and transpi-ration rate were stimulated by 100 Gy irradiation treatment and the higher doses inhibited these parameters. Antioxi-dant activity in the leaves of P. pinnata tended to increase after irradiation in a dose-dependent manner. All the plants under different treatments of γ-irradiation showed stimu-lation in production of proline, flavonoid, and phenolic content in comparision to the control. The findings of the present study showed that γ-irradiation treatment stimu-lates the secondary metabolite production (proline, flavo-noid and phenolic) and favours faster growth of P. pinnata.