Comparison of expression characteristics of OsPR1 genes Induction levels of OsPR1 genes by pathogens, wounding, and defense signal compounds, and their constitutive expression levels in organs were compared. The transcript levels in healthy 4th leaves are shown in the right most column. ++ very highly inducible or expressed gene, + highly inducible or expressed gene, ± gene whose induction or expression was not clear, − not inducible or expressed gene