SNAC1-OsERF103-OsSDG705 module mediates drought response in rice

Area of Science:

• Plant Biology
• Molecular Genetics
• Agricultural Science

Background:

• Drought stress significantly impacts plant growth and crop yields.
• Plants utilize complex transcriptional regulation for drought adaptation.
• Identifying key regulatory genes is crucial for improving crop resilience.

Purpose of the Study:

• To identify rice genes involved in drought tolerance.
• To elucidate the regulatory mechanism of OsERF103 in drought response.
• To understand the epigenetic control and evolutionary significance of OsERF103.

Main Methods:

• Genome-scale mutagenesis screening in rice under drought stress.
• Chromatin immunoprecipitation sequencing (ChIP-seq) and RNA sequencing (RNA-seq).
• Analysis of protein-protein interactions and epigenetic modifications (H3K4me3 deposition).

Main Results:

• OsERF103, an APETALA2/Ethylene Responsive Factor, was identified as a positive regulator of drought tolerance in rice.
• OsERF103 directly regulates approximately 1000 genes and interacts with SNAC1 to control drought-related genes like OsbZIP23.
• OsERF103 recruits a histone methyltransferase to modulate H3K4me3 levels at key drought-response loci, influencing gene expression.

Conclusions:

• OsERF103 plays a critical role in rice drought tolerance through synergistic regulation with SNAC1 and epigenetic modifications.
• Natural variations in OsERF103 have been selected during rice domestication, indicating its adaptive importance.
• This study provides a mechanistic framework for OsERF103-mediated drought response, offering potential for developing drought-tolerant rice varieties.