Fig. 4 Carbon isotope discrimination (), internal substomatal [CO₂] (C_i), and water-use efficiency given as leaf photosynthetic assimilation (A_a, leaf area basis) divided by stomatal conductance (g_s) of tall fescue Kentucky 31 (K-31) populations selected for high and low . Plants were grown under greenhouse conditions and data averaged across well-watered and polyethylene glycol stress treatments. The bar is the LSD at

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