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Free Content A subset of hypersensitive response marker genes, including HSR203J, is the downstream target of a spermine signal transduction pathway in tobacco

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A cellular signal transduction pathway induced by the polyamine, spermine (Spm), and transmitted by mitochondrial dysfunction is proposed in tobacco. In this investigation, we further resolve the pathway by identifying a subset of hypersensitive response (HR) marker genes as downstream components. In a previous report, we identified harpin-induced 1 (HIN1) and two closely related genes as responsive to Spm. Other HR marker genes, HSR203J, HMGR, HSR201, and HSR515, are also Spm-responsive. Induction of these HR marker genes, including HIN1, by Spm was suppressed by pre-treatment with antioxidants, calcium channel blockers, inhibitor of mitochondrial permeability transition pore openings, and blockers of amine oxidase/polyamine oxidase. Such quenching is also observed for Spm-induced activation of two mitogen-activated protein kinases (MAPKs), salicylic acid-induced protein kinase (SIPK), and wound-induced protein kinase (WIPK), and upregulation of the WIPK gene, suggesting that all these components are part of the same signaling pathway. Furthermore, gain-of-function and loss-of-function studies on MAPK cascade members reveal that the expression of Spm-induced HR marker genes varies with respect to involvement of SIPK/WIPK activation.
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Keywords: hypersensitive response; mitochondria; signal transmitter; spermine; target gene; tobacco

Document Type: Research Article

Affiliations: 1: Graduate School of Life Sciences, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, Miyagi 980-8577, Japan, 2: Iwate Biotechnology Research Center, 22-174-4 Narita, Kitakami, Iwate 024-0003, Japan

Publication date: November 1, 2004

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