siz1 hyperaccumulates high levels of SA. Ten-day-old wild-type, siz1 (siz1-2 and siz1-3), NahG siz1-2, NahG, and snc1 seedlings grown at 24°C on medium were harvested. SA content was determined by HPLC analysis. Illustrated are data from three independent experiments, mean ± se (micrograms of SA per gram fresh weight). Experiments were repeated four times in the same condition. snc1 seedlings result hyperaccumulation of SA (Zhang et al., 2003).