Figure 1.

Frequency distributions for Na⁺ concentrations in the leaf blade of single-gene BC₅F₂ families grown at 150 mm NaCl for 10 d. A, Nax1 family (n = 41). Individuals in the low Na⁺ class (black bars) were homozygous for the Line 149 allele of gwm312; individuals in the high Na⁺ class (white bars) were homozygous for the cv Tamaroi allele of gwm312; and individuals in the intermediate class (hatched bars) were heterozygous. Parental means were 141 ± 14 μmol g⁻¹ dry weight for Line 149 and 811 ± 31 for cv Tamaroi (n = 6). B, Nax2 family (n = 140). Parental means were 278 ± 37 μmol g⁻¹ dry weight for Line 149 and 1,193 ± 48 for cv Tamaroi.