Fig. 4.

Correlation coefficients (r) of the linear regressions across genotypes within each water treatment between leaf ash and the water status traits g_s, e_a/e_i, LWC and kernel Δ¹⁸O. The x-axis shows the water status traits evaluated, with the more instantaneous (g_s and e_a/e_i) on the left and the more integrative in time and plant level (LWC and kernel Δ¹⁸O) on the right. For the 15 degrees of freedom available, Pearson correlation coefficients greater than 0·33, 0·41 and 0·56 are statistically significant at the 10, 5 and 1 % levels, respectively. Correlation coefficients are shown in absolute values.