In rice seedlings, submergence induced histone H3K4
trimethylation and H3 acetylation in alcohol dehydrogenase
1 (ADH1) and pyruvate decarboxylase 1 (PDC1)
genes. These histone modifications were correlated with
enhanced expression of ADH1 and PDC1 under stress.
The modifications, however, were dynamic and were
restored to the basal level after stress was relieved by
reaeration [9].