FIGURE 3.

Drought stress tolerance assays. (A) Phenotype of sapk2 mutants and wild-type plants before drought stress, after drought stress and re-watered for 7 days. Drought stress analysis was repeated three times. In each repeated experiment, at least 40 plants were used for each individual line. One representative picture was shown. (B) Survival rates corresponding to (A). (C) Water loss rates in the leaves segregated from sapk2 mutants and wild type plants under normal conditions. (D) The contents of soluble sugar and (E) proline in leaf tissues sampled from sapk2 mutants and wild-type plants before and after drought stress. Error bars indicate the SD of three independent experiments. ^∗∗indicate statistically significant differences between mutant lines and wild type plants (P < 0.01). FW, fresh weight.