<p>Mung bean is a fast maturing legume crop, grown for its nutritional value and a rich source of digestible protein. However, it is poor in grain yield due the breakdown of its photosynthetic machinery at reproductive stage as organic nitrogen is relocated heavily from source to economic sink for grain development. Therefore, in order to augment endogenous organic nitrogen sources by minimizing the deficit of organic nitrogen during reproductive phase, an experiment was accomplished to analyse the photosynthetic and yield responses of two IPM2-3 and Pusa Vishal varieties to exogenous treatments of amino compounds namely GABA (1 mM); Glutathione (0.5 mM); Proline (5 mM); Spermidine (0.25 mM); Arginine (1.25 mM); Glycine betaine (50 mM) and Tryptophan (5 mM). These treatments were applied at the flowering stage with water spray as control. Results of the present investigation demonstrated significant improvements in yield and its related traits such as SPAD value, photosynthetic pigments level, Fv/Fm ratio, electron transport rate (ETR), non-photochemical quenching (NPQ), photosynthesis rate, pod number, pod weight, and test weight. The most notable yield enhancement was observed with glutathione, followed by proline and GABA. These findings in turn suggested that foliar application of amino compounds may effectively be used to minimize the organic nitrogen deficits during flowering to enhance mung bean yield by improving photosynthetic activity and minimizing organic nitrogen deficits. Consequently, treatments of amino compounds may also be considered a viable agronomic strategy to improve mung bean productivity.</p>