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Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth

ABSTRACT: This SuperSeries is composed of the SubSeries listed below.

ORGANISM(S): Oryza sativa

PROVIDER: GSE227771 | GEO | 2025/12/09

REPOSITORIES: GEO

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Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [ChIP-seq]

Project description:Although phosphorus is one of the most important essential elements for plant growth and development, the epigenetic regulation of inorganic phosphate (Pi) signaling is poorly understood. In this study, we identified the high-mobility-group protein OsHMGB1 as a key regulator of phosphate homeostasis and plant growth in rice (Oryza sativa). OsHMGB1 expression is induced by Pi starvation and encodes a nucleus-localized protein. Relative to wild-type plants, Oshmgb1 mutant plants had lower Pi content in their leaves, whereas plants overexpressing OsHMGB1 had higher Pi content, indicating that OsHMGB1 positively regulates Pi accumulation. Transcriptome deep sequencing and chromatin immunoprecipitation followed by sequencing showed that OsHMGB1 regulated the expression of a series of phosphate starvation responsive (PSR) genes by binding to their promoters. Furthermore, Assay for Transposase-Accessible Chromatin followed by sequencing revealed that OsHMGB1 was involved in maintaining chromatin accessibility. Indeed, OsHMGB1 occupancy positively correlated with genome-wide chromatin accessibility and gene expression levels. Notably, we determined that OsHMGB1 interacted with RNA polymerase II to help regulate transcription, especially under low Pi conditions. Taken together, our results suggest that OsHMGB1 functions as a transcriptional facilitator, revealing a key epigenetic mechanism to regulate Pi homeostasis and fine-tune plant acclimation responses to Pi-limited environments. Chromatin immunoprecipitation DNA-sequencing (ChIP-seq) for HMG-GFP transgenic plants

2025-12-09 | GSE227770 | GEO

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [ATAC-seq]

2025-12-09 | GSE227769 | GEO

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [RNA-seq i]

2025-12-09 | GSE227767 | GEO

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [RNA-seq II]

2025-12-09 | GSE227768 | GEO

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth

Project description:Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth

| PRJNA946784 | ENA

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [ChIP-seq]

Project description:Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [ChIP-seq]

| PRJNA946786 | ENA

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [ATAC-seq]

Project description:Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [ATAC-seq]

| PRJNA946787 | ENA

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [RNA-seq II]

Project description:Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [RNA-seq II]

| PRJNA946788 | ENA

Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [RNA-seq i]

Project description:Rice Chromatin Protein OsHMGB1 Is a Transcriptional Facilitator that Regulates Phosphate Homeostasis and Plant Growth [RNA-seq i]

| PRJNA946789 | ENA

The Rice Phosphate Transporter Protein OsPT8 Regulates Disease Resistance and Plant Growth.

Project description:The absorption of nutrients and disease resistance are two indispensable physiological processes in plants; however, it is still largely unknown whether there is cross-talk between their molecular signaling pathways. In this study, we identified the rice OsPT8 protein, which is a member of the phosphate transporters (PTs) Pht1 family and also plays a role in rice disease resistance. The transcriptional level of OsPT8 is suppressed after infection with rice pathogens and treatment with pathogen-associated molecular patterns (PAMPs). Overexpression of OsPT8 suppresses rice disease resistance against the pathogens Magnaporthe oryzae and Xanthomonas oryzae pv. oryzae. Accordingly, the transcription level of resistance related genes, such as PAL and PBZ1, is inhibited in plants overexpressing OsPT8 (OsPT8-OX) after inoculation with these pathogens. In OsPT8-OX plants, PAMPs-triggered immunity (PTI) response genes, such as OsRac1 and SGT1, are suppressed during treatment with PAMPs chitin or flg22. Moreover, the typical response of PTI is suppressed after chitin or flg22 treatment. We also identified OsPT8 as an interactor of a rice mitogen-activated protein kinase BWMK1, which is a regulator of disease resistance. Under low phosphate (Pi) conditions, the OsPT8-OX plants display better agronomic traits than the control plants. However, the differences in development between OsPT8-OX and the control plants are reduced upon the increase of Pi concentration. These results demonstrate that OsPT8 regulates the transduction of Pi signaling for development and negatively regulates rice immunity.

| S-EPMC6443681 | biostudies-literature

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