NDLI: Identification of a regulatory element responsible for salt induction of rice OsRAV2 through ex situ and in situ promoter analysis

Content Provider	Springer Nature Link
Author	Duan, Yong Bo Li, Juan Qin, Rui Ying Xu, Rong Fang Li, Hao Yang, Ya Chun Ma, Hui Li, Li Wei, Peng Cheng Yang, Jian Bo
Copyright Year	2015
Abstract	Salt is a major environmental stress factor that can affect rice growth and yields. Recent studies suggested that members of the AP2/ERF domain-containing RAV (related to ABI3/VP1) TF family are involved in abiotic stress adaptation. However, the transcriptional response of rice RAV genes (OsRAVs) to salt has not yet been fully characterized. In this study, the expression patterns of all five OsRAVs were examined under salt stress. Only one gene, OsRAV2, was stably induced by high-salinity treatment. Further expression profile analyses indicated that OsRAV2 is transcriptionally regulated by salt, but not KCl, osmotic stress, cold or ABA (abscisic acid) treatment. To elucidate the regulatory mechanism of the stress response at the transcriptional level, we isolated and characterized the promoter region of OsRAV2 (P$_{ OsRAV2 }$). Transgenic analysis indicated that P$_{ OsRAV2 }$ is induced by salt stress but not osmotic stress or ABA treatment. Serial 5′ deletions and site-specific mutations in P$_{ OsRAV2 }$ revealed that a GT-1 element located at position −664 relative to the putative translation start site is essential for the salt induction of P$_{ OsRAV2 }$. The regulatory function of the GT-1 element in the salt induction of OsRAV2 was verified in situ in plants with targeted mutations generated using the CRISPR/Cas9 (clustered regularly interspaced short palindromic repeats/CRISPR-associated protein 9) system. Taken together, our results indicate that the GT-1 element directly controls the salt response of OsRAV2. This study provides a better understanding of the putative functions of OsRAVs and the molecular regulatory mechanisms of plant genes under salt stress.
Starting Page	49
Ending Page	62
Page Count	14
File Format	PDF
ISSN	01674412
Journal	Plant Molecular Biology
Volume Number	90
Issue Number	1-2
e-ISSN	15735028
Language	English
Publisher	Springer Netherlands
Publisher Date	2015-10-19
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Salt response RAV GT-1element Rice CRISPR/Cas9 Plant Sciences Biochemistry Plant Pathology
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Agronomy and Crop Science

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