Effects of salinity stress on plant growth.

<p>(A) Phenotype of WT and OX rice seedlings under salt treatment. Photographs were taken after 5 d of growth in water (control) and 100 mM or 140 mM NaCl. For each treatment, 20 seedlings were measured. Bar = 1 cm; (B) Statistics analysis of plants height under salt treatment. WT and OX plants stem height at 5 days of growth in various concentrations of NaCl. Bar = 1 cm. Asterisks indicate significant difference at P <0.01 compared with the wild type by Student’s t test; (C) Quantitative analysis of survival rates under salt treatment. The results are averages of three independent experiments with 30 plants per experiment. Asterisks indicate significant difference at P <0.01 compared with the wild type by Student’s t test; (D) Phenotype of wide type <i>Arabidopsis</i> (Col) and transgenic <i>Arabidopsis</i> with and without GA₃ under salt treatment. Physiological changes in WT and <i>OsGA2ox5-ox</i> transgenic <i>Arabidopsis</i> plants transferred to plates containing 170 mM NaCl. Photographs were taken 3 weeks after transfer. +GA represents treatment with 10 µM GA₃.