Identification of endogenous small peptides involved in rice immunity through transcriptomics- and proteomics-based screening

Pingyu Wang, Shaolun Yao, Ken ichi Kosami, Ting Guo, Jing Li, Yuanyuan Zhang, Yoichiro Fukao, Takako Kaneko-Kawano, Heng Zhang, Yi Min She, Pengcheng Wang, Weiman Xing, Kousuke Hanada, Renyi Liu, Yoji Kawano

    Research output: Contribution to journalArticlepeer-review

    7 Citations (Scopus)

    Abstract

    Small signalling peptides, generated from larger protein precursors, are important components to orchestrate various plant processes such as development and immune responses. However, small signalling peptides involved in plant immunity remain largely unknown. Here, we developed a pipeline using transcriptomics- and proteomics-based screening to identify putative precursors of small signalling peptides: small secreted proteins (SSPs) in rice, induced by rice blast fungus Magnaporthe oryzae and its elicitor, chitin. We identified 236 SSPs including members of two known small signalling peptide families, namely rapid alkalinization factors and phytosulfokines, as well as many other protein families that are known to be involved in immunity, such as proteinase inhibitors and pathogenesis-related protein families. We also isolated 52 unannotated SSPs and among them, we found one gene which we named immune response peptide (IRP) that appeared to encode the precursor of a small signalling peptide regulating rice immunity. In rice suspension cells, the expression of IRP was induced by bacterial peptidoglycan and fungal chitin. Overexpression of IRP enhanced the expression of a defence gene, PAL1 and induced the activation of the MAPKs in rice suspension cells. Moreover, the IRP protein level increased in suspension cell medium after chitin treatment. Collectively, we established a simple and efficient pipeline to discover SSP candidates that probably play important roles in rice immunity and identified 52 unannotated SSPs that may be useful for further elucidation of rice immunity. Our method can be applied to identify SSPs that are involved not only in immunity but also in other plant functions.

    Original languageEnglish
    Pages (from-to)415-428
    Number of pages14
    JournalPlant Biotechnology Journal
    Volume18
    Issue number2
    DOIs
    Publication statusPublished - Feb 1 2020

    Keywords

    • Magnaporthe oryzae
    • immunity
    • proteomics
    • rice
    • signalling peptide
    • small secreted protein
    • transcriptomics

    ASJC Scopus subject areas

    • Biotechnology
    • Agronomy and Crop Science
    • Plant Science

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