Fig. 1.

SWO1 is required for root growth under salt stress. (a) Four-day-old seedlings of the wild type and the three swo1 mutant alleles, swo1–2, swo1–3, and swo1–4, were transferred to Murashige and Skoog (MS) and MS + 100 mM NaCl media, respectively. The photographs were taken 7 days after transfer. (b) Quantification of the root lengths of the wild type and the swo1 mutants after being transferred to MS and MS + 100 mM NaCl media for 7 days. The values indicate the means ± SD (n = 10). Different letters represent significant differences between different genotypes under the same treatment, P < 0.01 (one-way ANOVA). (c) Phenotypes of the wild type, swo1–2, and complementation plants after being transferred to MS media supplemented with or without 100 mM NaCl. The seedlings were photographed 7 days after growth. (d) Comparison of the root length of the wild type, swo1–2, and complementation plants after being transferred to MS and MS + 100 mM NaCl media for 7 days. Values are means ± SD (n = 8). Different letters represent significant differences between different genotypes under the same treatment, P < 0.01 (one-way ANOVA). (e) Analysis of Na⁺ and K⁺ concentrations and Na⁺/K⁺ ratio in the roots and shoots of the wild type and the swo1 mutants after being transferred to agar-containing MS media with or without 100 mM NaCl for 10 days. Data are means ± SD (n = 3). Different letters indicate significant differences among the samples under the same treatment, P < 0.05 (one-way ANOVA). DW, dry weight