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

Authors
Hai An TruongLee, SeokjinCao Son TrinhLee, Won JeChung, Eui-HwanHong, Suk-WhanLee, Hojoung
Issue Date
30-4월-2021
Publisher
FRONTIERS MEDIA SA
Keywords
Arabidopsis; HDA15 gene; salinity; stress tolerance; histone modification; ABA accumulation
Citation
FRONTIERS IN PLANT SCIENCE, v.12
Indexed
SCIE
SCOPUS
Journal Title
FRONTIERS IN PLANT SCIENCE
Volume
12
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/128198
DOI
10.3389/fpls.2021.640443
ISSN
1664-462X
Abstract
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.
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