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Salt stress constitutes a major form of abiotic stress in plants. Histone modification plays an important role in stress tolerance, with particular reference to salt stress resistance. In the current study, we found that HDA15 overexpression confers salt stress resistance to young seedling stages of transgenic plants. Furthermore, salt stress induces  HDA15  overexpression. Transcription levels of stress-responsive genes were increased in transgenic plants overexpressing  HDA15  ( HDA15 OE ).  NCED3 , an abscisic acid (ABA) biosynthetic gene, which is highly upregulated in  HDA15  transgenic plants, enhanced the accumulation of ABA, which promotes adaptation to salt stress. ABA homeostasis in  HDA15 OE  plants is maintained by the induction of CYP707As, which optimize endogenous ABA levels. Lastly, we found that the double-mutant  HDA15 OE/hy5 ko  plants are sensitive to salt stress, indicating that interaction between HDA15 and ELONGATED HYPOCOTYL 5 (HY5) is crucial to salt stress tolerance shown by  HDA15 OE  plants. Thus, our findings indicate that  HDA15  is crucial to salt stress tolerance in  Arabidopsis .

Overexpression of the HDA15 Gene Confers Resistance to Salt Stress by the Induction of NCED3, an ABA Biosynthesis Enzyme