Contribution of the type II secretion system in systemic infectivity of <Emphasis Type="Italic">Ralstonia </Emphasis><Emphasis Type="Italic">solanacearum</Emphasis> through xylem vessels |
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Authors: | Shintaro Tsujimoto Kazuhiro Nakaho Masanori Adachi Kouhei Ohnishi Akinori Kiba Yasufumi Hikichi |
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Institution: | (1) Laboratory of Plant Pathology and Biotechnology, Kochi University, Nankoku, Kochi 783-8502, Japan;(2) National Agricultural Research Center, Tsukuba, Ibaraki 305-8666, Japan;(3) Research Institute of Molecular Genetics, Kochi University, Nankoku, Kochi 783-8502, Japan |
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Abstract: | Ralstonia solanacearum strain OE1-1 (OE1-1) systemically invades tobacco plants and causes bacterial wilt. A type II secretion system (T2SS)-deficient
mutant of OE1-1, derived from EZ::TN<KAN-2>transposon-insertion, retained the ability of the parent strain to produce exopolysaccharide
in vitro and grow in intercellular spaces immediately after invasion of host plants, but lost the ability to systemically
infect the host. With transmission electron microscopy, the mutant was not observed in xylem vessels. These findings suggest
that the T2SS contributes to systemic infection by enabling the bacteria to invade xylem vessels. |
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Keywords: | Ralstonia solanacearum Type II secretion system Xylem vessels |
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