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HDA9 regulates intracellular ABA levels under dehydration stress. ABA content in detached 10-d-old WT, hda9-1, hda9-2, and hda9-1/HDA9 plants during a 1-h dehydration. ABA content was measured from 20 whole seedlings of each genotype. Error bars represent the SD from four independent experiments. Asterisks represent significant differences from the WT (*, p-value ≤ 0.05, **, p-value ≤ 0.01, Student's t-test).
