Silencing of Nicotiana benthamiana SEC14 phospholipid transfer protein reduced jasmonic acid dependent defense against Pseudomonas syringae

  • Kiba Akinori
    Laboratory of Plant Pathology and Biotechnology, Faculty of Agriculture, Kochi University
  • Imanaka Yu
    Laboratory of Plant Pathology and Biotechnology, Faculty of Agriculture, Kochi University
  • Nakano Masahito
    Laboratory of Plant Pathology and Biotechnology, Faculty of Agriculture, Kochi University Okayama Prefectural Technology Center for Agriculture, Forestry, and Fisheries, Research Institute for Biological Sciences
  • Galis Ivan
    Institute of Plant Science and Resources, Okayama University
  • Hojo Yuko
    Institute of Plant Science and Resources, Okayama University
  • Shinya Tomonori
    Institute of Plant Science and Resources, Okayama University
  • Ohnishi Kouhei
    Research Institute of Molecular Genetics, Kochi University
  • Hikichi Yasufumi
    Laboratory of Plant Pathology and Biotechnology, Faculty of Agriculture, Kochi University

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  • Silencing of <i>Nicotiana benthamiana</i> SEC14 phospholipid transfer protein reduced jasmonic acid dependent defense against <i>Pseudomonas syringae</i>

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We previously identified SEC14, phospholipid transfer protein superfamily gene, in Nicotiana benthamiana (NbSEC14) that was closely related to phospholipid signaling as well as jasmonic acid-dependent defense responses during plant immune responses against Ralstonia solanacearum. To examine effect of NbSEC14-silencing on basal plant defenses, we used two other bacterial pathogens with different virulent strategies, Pseudomonas syringae pv. tabaci and pv. mellea. NbSEC14-silenced plants showed accelerated growth of P. syringae pv. tabaci and pv. mellea, and formation of necrotic lesions. Induction of JA-related PR-4 gene was compromised in NbSEC14-silenced plants, which was supported by reduced jasmonic acid levels in NbSEC14-silenced plants. These results suggested that NbSEC14 might be regulating plant basal resistance against plant pathogenic Pseudomonads via jasmonic acid-dependent signaling pathway.

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