Genome-wide analysis of histone H3 lysine 9 acetylation in Populus trichocarpa under drought stress

We report on the genome-wide distribution pattern of histone H3 lysine 9 acetylation (H3K9ac) and the pattern's association with whole genome expression profiles in Populus trichocarpa subjected to soil-water depletion. We identified a set of drought responsive genes whose expression is directly regulated by differential modification of H3K9ac. Overall design: We treated 3-month-old Populus trichocarpa plants by no watering. Plants were under a mild drought state without watering after 5 days (Day5) and under a severe drought state after 7 days (Day7), and plants fully irrigated were as a control (Day0). Differential H3K9ac enrichments under mild and severe drought treatments were examined in stem differentiating xylem (SDX) of the Populus trichocarpa plants.