Frontiers in Plant Science (May 2021)

Genome-Wide Identification Reveals That Nicotiana benthamiana Hypersensitive Response (HR)-Like Lesion Inducing Protein 4 (NbHRLI4) Mediates Cell Death and Salicylic Acid-Dependent Defense Responses to Turnip Mosaic Virus

  • Xinyang Wu,
  • Xinyang Wu,
  • Yuchao Lai,
  • Shaofei Rao,
  • Lanqing Lv,
  • Mengfei Ji,
  • Mengfei Ji,
  • Kelei Han,
  • Jiajia Weng,
  • Yuwen Lu,
  • Jiejun Peng,
  • Lin Lin,
  • Guanwei Wu,
  • Jianping Chen,
  • Jianping Chen,
  • Fei Yan,
  • Hongying Zheng

DOI
https://doi.org/10.3389/fpls.2021.627315
Journal volume & issue
Vol. 12

Abstract

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Hypersensitive response (HR)-like cell death is an important mechanism that mediates the plant response to pathogens. In our previous study, we reported that NbHIR3s regulate HR-like cell death and basal immunity. However, the host genes involved in HR have rarely been studied. Here, we used transcriptome sequencing to identify Niben101Scf02063g02012.1, an HR-like lesion inducing protein (HRLI) in Nicotiana benthamiana that was significantly reduced by turnip mosaic virus (TuMV). HRLIs are uncharacterized proteins which may regulate the HR process. We identified all six HRLIs in N. benthamiana and functionally analyzed Niben101Scf02063g02012.1, named NbHRLI4, in response to TuMV. Silencing of NbHRLI4 increased TuMV accumulation, while overexpression of NbHRLI4 conferred resistance to TuMV. Transient overexpression of NbHRLI4 caused cell death with an increase in the expression of salicylic acid (SA) pathway genes but led to less cell death level and weaker immunity in plants expressing NahG. Thus, we have characterized NbHRLI4 as an inducer of cell death and an antiviral regulator of TuMV infection in a SA-mediated manner.

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