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Effect of decreasing leaf pre-dawn water potential (ΨPD) on leaf stomatal conductance (gs) (A); effect of decreasing gs on internal CO2 concentration (Ci) (B) and effect of decreasing gs on photosynthesis (Pn) (C) of a commercial variety (CV) and four landraces (L1, L2, L3, L4) of cowpea under well-watered (WW) and water deficit (WD) conditions. Points represent individual measurements. ** Regression coefficient significant with p < 0.05.
