Fig. 1

Ascorbic acid (AsA) alleviates the inhibitory effect of salt stress on root growth in ABI4-overexpressing seedling lines. a Seedling growth phenotype of the Col-0, abi4–102, abi4–103 and ABI4-overexpressing lines under 100 mM NaCl treatment with or without 40 μM AsA. 3-day-old seedlings were transferred to 1/2 MS medium containing salt with or without AsA and grown for another four days. Bar = 1.4 cm. b The root length of Col-0, abi4–102, abi4–103 and ABI4-overexpressing lines under 100 mM NaCl treatment with or without 40 μM AsA. Values are means ± SD (n = 30). c The relative root length of Col-0, abi4–102, abi4–103 and ABI4-overexpressing lines under 100 mM NaCl treatment with or without 40 μM AsA compared with those under control conditions. Values are means ± SD n = 3. The root length of all seedlings under control conditions were normalized as 100. Different letters indicate statistically significant differences among the indicated data (P < 0.05, ANOVA with Tukey’s test)