Abstract
The damage to plants by ozone is an environmental problem. The ozs1-1 mutant is an ozone-sensitive mutant we isolated aiming at the elucidation of the underlying molecular mechanisms, and has a T-DNA-tagged responsible gene encoding a transporter-like protein of the TDT family. Microarray data showed that expression of the OZS1 gene was not induced by ozone. The OZS1 transcripts were detected in the wild-type plants, but not in the ozs1-1 mutant plants. The ozs1-1 mutant showed normal jasmonate-sensitivity. Results of comparisons of chlorophyll content, ion leakage, and growth inhibition under ozone exposure between ozs1-1 and wild-type plants, and a comparison of the growth inhibition between ozs1-1 and other ozone-sensitive lines will be presented. Tolerance to high light or low temperature was normal in the ozs1-1 mutant. However, it showed sulfur dioxide sensitivity. The results indicate that OZS1 plays a role in the tolerance mechanism common to ozone and sulfur dioxide.