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The study was conducted to appraise the influence of water deficit conditions on growth, yield, gas exchange characteristics, and antioxidative defense system in two mungbean [Vigna radiata (L.) Wilczek) lines, 97001 and 97012. The plants of both lines were grown for 30 days under normal natural conditions, after which time two drought regimes [control (well-watering and 60% field capacity)] were applied. Data for various attributes were recorded after 30 days of drought application while at maturity, yield attributes were recorded. Water deficit conditions caused a considerable reduction in growth attributes, net CO2 assimilation rate, stomatal conductance, electron transport ratio, total phenolics, leaf Ca2+ and yield attributes. Imposition of water deficit conditions significantly increased leaf tocopherol contents and activity of catalase in both mungbean lines. Both lines showed a considerable variation in growth attributes, the line 97001 being better in performance compared with 97012 under water deficit conditions.