Figure 6. Changes in yield and photosynthesis in relation to modification of diffusive resistances to CO₂ uptake following water-stress.

Those varieties that experienced smaller reductions in parameters were more tolerant of drought. a) relationship between Δyield and Δg _s (linear regression: R² = 0.337; F _1,4 = 2.032; P = 0.227); b) relationship between Δyield and Δg _m (linear regression: R² = 0.134; F _1,4 = 0.618; P = 0.476); c) relationship between Δyield and Δg _tot (linear regression: R² = 0.0818; F _1,4 = 0.356; P = 0.583); d) relationship between ΔA and Δg _s (linear regression: R² = 0.0003; F _1,4 = 0.00106; P = 0.976); e) relationship between ΔA and Δg _m (linear regression: R² = 0.742; F _1,4 = 11.527; P = 0.0274); f) relationship between ΔA and Δg _tot (linear regression: R² = 0.715; F _1,4 = 10.042; P = 0.0339), and; g) relationship between Δyield and ΔA (linear regression: R² = 0.427; F _1,4 = 2.979; P = 0.159). Error bars as in Figure 1. Numbers next to data points indicate Oryza sativa variety as in Figure 1.