Isolation and characterization of an asparagine-rich protein that regulates hypersensitive cell death-mediated resistance in Nicotiana plants

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概要

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• We isolated and characterized Ralstonia solanacearum-responsive genes (RsRGs) related to the hypersensitive response (HR) by virus-induced gene silencing using Nicotiana benthamiana and the potato virus X vector system. We focused on RsRGM10, because induction of HR was delayed in RsRGM10-silenced plants challenged with incompatible R. solanacearum 8107, which induces the HR in, N. benthamiana. The amino acid sequence deduced from the full-length RsRGM10 cDNA showed approximately 90% identity with rolB overexpressed 1 (ROX1) from N. tabacum, and contained an asparagine-rich sequence. We designated this protein NbARP (N. benthamiana asparagine-rich protein). Expression of HR-related hin1 and onset of the oxidative burst were delayed in NbARP-silenced plants, and induction of myelin basic kinase activity was reduced. Growth of R. solanacearum 8107 was accelerated in NbARP-silenced plants. Induction of the HR by Pseudomonas cichorii and Pseudomonas syringae pv. syringae was also delayed in NbARP-silenced plants. Silencing of NbARP reduced induction of HR-cell death by Agrobacterium tumefaciens-mediated transient expression of HR elicitors and a constitutively active form of mitogen activated protein kinase kinase. The population of R. solanacearum 8107 was decreased in NbARP-overexpressing plants. These results suggest that NbARP is closely related to the HR.

• 日本植物細胞分子生物学会の論文

著者

• Ohnishi Kouhei

  Research Institute Of Molecular Genetics Kochi University

• Mizumoto Hiroyuki

  Laboratory Of Plant Pathology Graduate School Of Agriculture Kyoto University

• Kiba Akinori

  Laboratory Of Plant Pathology And Biotechnology Faculty Of Agriculture Kochi University

• Nishihara Masahiro

  Iwate Biotechnology Res. Center

• Yoshioka Hirofumi

  Laboratory Of Defense In Plant-pathogen Interactions Graduate School Of Bioagricultural Sciences Nag

• Takahashi Akiko

  Laboratory Of Forest Biology Department Of Agriculture Kyoto University

• Gupta Meenu

  Laboratory Of Plant Pathology And Biotechnology Faculty Of Agriculture Kochi University

• Komori Daisuke

  Laboratory Of Plant Pathology And Biotechnology Faculty Of Agriculture Kochi University

• Hikichi Yusufumi

  Laboratory of Plant Pathology and Biotechnology, Faculty of Agriculture, Kochi University

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