Figure 2.
Me-JA Pretreatment Abolishes O3-Induced Cell Death.
Plants treated with various concentrations of Me-JA 22 hr before exposure to O3 were exposed to a single 300-ppb dose of O3 for 6 hr. Plants were allowed to recover in O3-free air for an additional 16 hr after the O3 exposure before being scored for visible injury symptoms. Plants sprayed with 0.1% alcohol alone and maintained in O3-free air served as controls. Plants exposed to O3 alone were also sprayed with 0.1% alcohol to normalize the spraying effect. The experiments were performed twice, and the plants presented are from a representative experiment.