Figure 1. Correlation of root Na⁺/K⁺ ratio with salt resistance during tomato domestication.

• A
  Distribution of 369 accessions, including PIM (36 S. pimpinellifolium accessions), CER (118 S. lycopersicum var. cerasiforme accessions), and BIG (215 S. lycopersicum accessions).
• B
  The Na⁺ and K⁺ contents and Na⁺/K⁺ ratio in roots and shoots of three groups of 369 accessions after treatment with 150 mM NaCl for 1 day.
• C
  Linear regression of root Na⁺/K⁺ ratio under salt stress (150 mM NaCl for 1 day) and fruit weight in 195 accessions from three groups. R ², coefficient of determination. n is the accession number of the three groups.
• D
  The Na⁺/K⁺ ratios in roots of TS‐21, TS‐422, TS‐577, and TS‐670 after treatment with 150 mM NaCl for the indicated time (n = 3 biological repeats).
• E, F
  Salt resistance assay of two PIM accessions (TS‐21 and TS‐422) and two BIG (TS‐577 and TS‐670). 20‐day‐old seedlings grown in soil were treated with 200 mM NaCl for 3 weeks (E). The survival rates were obtained from at least 12 plants in three repeated experiments (F).

Data information: In (B), the box indicates the range of the percentiles of the total data determined using Tukey's method, the central line indicates the median, the whiskers indicate the interquartile range, and the outer dots are outliers. n indicates the number of accessions belonging to each group. The plots represent the means of three repeated experiments. Significant difference was determined by Student's t‐test. In (F), the data are means ± SD (n = 3).