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Water use efficiencies for the whole plant (WUE,) and singie leaves (WUE,) were studied in a greenhouse as a function of soil moisture during four phenological stages of bush bean growth, WUE, increased significantly with soil moisture stress and attained its maximum value before the fiowering stage. WUE, and WUE, were linearly related (r = 0.92), and WUE; was correlated with the transpiration rate (r = -0.87), stomatal conductance {r = -0.80) and photosynthetic rate (r = 0.81). Carbon isotope discrimination, ), decreased as soil moisture decreased, and ) was negatively correlated with both WUEj (r = -0.92) and WUE, {r = -0.88). There were significant differences in leaf N among water regimes.