Genome-wide discovery of OsHOX24-binding sites and regulation of desiccation stress response in rice

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  • Annapurna Bhattacharjee
    Jawaharlal Nehru University
  • Prabhakar Lal Srivastava
    National Institute of Plant Genome Research (NIPGR)
  • Onkar Nath
    National Institute of Plant Genome Research (NIPGR)
  • Mukesh Jain
    Jawaharlal Nehru University

OsHOX24 mediates regulation of desiccation stress response via complex regulatory network as indicated by its binding to several target genes including transcription factors in rice. HD-ZIP I subfamily of homeobox transcription factors (TFs) are involved in abiotic stress responses and plant development. Previously, we demonstrated the role of OsHOX24, a member of HD-ZIP I subfamily, in abiotic stress responses. In this study, we identified downstream targets of OsHOX24 under control and desiccation stress conditions via chromatin immunoprecipitation-sequencing (ChIP-seq) approach in wild-type and OsHOX24 over-expression transgenic in rice. OsHOX24-binding sites in each sample and differential binding sites between the samples were detected at various genomic locations, including genic and intergenic regions. Gene ontology enrichment analysis revealed that OsHOX24 direct target genes were involved in several biological processes, including plant development, ABA-mediated signalling pathway, ubiquitin-dependent protein catabolic process, ion transport, abiotic and biotic stress responses besides transcriptional and translational regulation. The enrichment of several cis-regulatory motifs representing binding sites of other TFs, such as ABFs, ERF1, MYB1, LTREs and SORLIP2, suggested the involvement of OsHOX24 in a complex regulatory network. These findings indicate that OsHOX24-mediated desiccation stress regulation involves modulation of a plethora of target genes, which participate in diverse pathways in rice.

Keywords

  • Binding Sites, Biological Phenomena, Desiccation, Gene Expression Regulation, Plant, Genes, Plant, Genome-Wide Association Study, Oryza/genetics, Plant Proteins/genetics, Plants, Genetically Modified/genetics, Promoter Regions, Genetic, Seedlings, Stress, Physiological/genetics, Transcription Factors/genetics, Transcriptome
Original languageEnglish
Pages (from-to)205-214
Number of pages10
JournalPlant Molecular Biology
Volume105
Issue number1-2
Early online date6 Oct 2020
DOIs
Publication statusPublished - 1 Jan 2021
Externally publishedYes
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