Fig. 3.

(a) Total plant biomass and leaf contents of (b) sodium and (c) and sulfur for different populations of Helianthus annuus or H. paradoxus in a salt tolerance experiment. For these parameter-species combinations significant population-by-treatment interaction effects were detected (compare Table 5). Means (a) or medians (b,c) are given with 95% confidence intervals. Within populations, different letters denote significant differences between means or means of log-transformed data (= medians of original data). Population-level anova results for treatment effects are given above each group of columns. Significant effects levels: ***, P < 0.001; **, P < 0.01; *, P < 0.05; ns, P > 0.05.