Rice chromatin protein OsHMGB1 is involved in phosphate homeostasis and plant growth by affecting chromatin accessibility

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 investigated the biological function and mode of action of the high-mobility-group box 1 prote...

Full description

Saved in:
Bibliographic Details
Published in:The New phytologist 2023-10, Vol.240 (2), p.727-743
Main Authors: Wang, Yan, Wang, Fei, Lu, Hong, Lin, Rongbin, Liu, Jiaming, Liu, Yu, Xu, Jiming, Wu, Yunrong, Wang, Zhiye, Zhou, Ming, Mo, Xiaorong, Wu, Zhongchang, Shou, Huixia, Zheng, Shaojian, Mao, Chuanzao
Format: Article
Language:English
Subjects:
Accessibility
Acclimation
Acclimatization
Chromatin
Epigenetics
Gene expression
Genes
Genomes
Homeostasis
Immunoprecipitation
Mode of action
Oryza sativa
Phosphate starvation response
Phosphates
Phosphorus
Plant growth
Plants
Proteins
Rice
Sequences
Sequencing
Starvation
Transcriptomes
Transgenic plants
Transposase
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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 investigated the biological function and mode of action of the high-mobility-group box 1 protein OsHMGB1 in rice (Oryza sativa), using molecular and genetic approaches. We determined that OsHMGB1 expression is induced by Pi starvation and encodes a nucleus-localized protein. Phenotypic analysis of Oshmgb1 mutant and OsHMGB1 overexpression transgenic plants showed that OsHMGB1 positively regulates Pi homeostasis and plant growth. Transcriptome deep sequencing and chromatin immunoprecipitation followed by sequencing indicated that OsHMGB1 regulates the expression of a series of phosphate starvation-responsive (PSR) genes by binding to their promoters. Furthermore, an assay for transposase-accessible chromatin followed by sequencing revealed that OsHMGB1 is involved in maintaining chromatin accessibility. Indeed, OsHMGB1 occupancy positively correlated with genome-wide chromatin accessibility and gene expression levels. Our results demonstrate that OsHMGB1 is a transcriptional facilitator that regulates the expression of a set of PSR genes to maintain Pi homeostasis in rice by increasing the chromatin accessibility, revealing a key epigenetic mechanism that fine-tune plant acclimation responses to Pi-limited environments.
ISSN:0028-646X
1469-8137
DOI:10.1111/nph.19189