The changes of OsTSN1 binding-genes in wildtype, P6-overexpression transgenic plants, SRBSDV-infected rice plants and SRBSDV-uninfected rice plants [RNA-seq]

ABSTRACT: Membraneless biomolecular condensates formed through liquid-liquid phase separation (LLPS) are known to play key roles in plant growth and stress responses. How plant viruses utilize LLPS to escape host immunity remains largely unexplored. Here, we present evidence demonstrating that the P6 protein encoded by southern rice black-streaked dwarf virus (SRBSDV) undergoes LLPS. P6 interacts with OsTSN1 and triggers the assembly of P6-OsTSN1-containing droplets that co-localize with stress granules (SGs). Within these P6-OsTSN1-containing droplets, P6 enhances the nuclease activity of OsTSN1 via promoting its multimerization to degrade transcripts with G-A-rich motifs of two transcription factors (TFs), OsNAC15 and OsLHY. These TFs regulate the transcription of OsJAZ6, OsJAZ12, and OsATG8C, involved in jasmonic acid (JA)- and autophagy-associated defense pathways in plants. Additionally, the degradation of OsNAC15 and OsLHY transcripts in the P6-OsTSN1-containing droplets in SGs weakens JA- and autophagy-mediated defenses in rice, facilitating SRBSDV infection. Interestingly, similar to SRBSDV P6, intrinsically disordered region (IDR)-containing RNA silencing suppressors encoded by other rice viruses such as rice black-streaked dwarf virus and rice stripe virus, also interact with OsTSN1, promoting the degradation of OsNAC15 and OsLHY transcripts to enhance viral infection. Our findings indicate that OsTSN1 acts as a central positive regulator of virus infection in rice, convergently co-opted by viruses. These insights help us to better understand the roles of LLPS and OsTSN1 in virus infection in rice.

ORGANISM(S): Oryza sativa

PROVIDER: GSE283860 | GEO | 2025/07/07

REPOSITORIES: GEO