Two phases of intracellular reactive oxygen species production during victorin-induced cell death in oats |
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Authors: | Masaru Sakamoto Yasuomi Tada Hitoshi Nakayashiki Yukio Tosa Shigeyuki Mayama |
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Institution: | (1) Laboratory of Plant Pathology, Graduate School of Science and Technology, Faculty of Agriculture, Kobe University, Kobe 657-8501, Japan |
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Abstract: | Reactive oxygen species (ROS) are thought to be involved in various forms of programmed cell death (PCD) in animal and plant
cells. PCD, along with the production of ROS, occurs during plant–pathogen interactions. Here we show that victorin, a host-specific
toxin produced by Cochliobolus victoriae, which causes victoria blight of oats, induces two phases of intracellular ROS production in victorin-sensitive oat mesophyll
cells. The initial production of ROS is restricted at mitochondria and not accompanied with cellular oxidative damage. Later
production of ROS is dispersed into cells concomitant with lipid peroxidation, chloroplast dysfunction, and cell death. Superoxide
dismutase can clearly suppress the initial ROS production and delay the progression of cell death. These data indicate that
the initial ROS production may be involved in the cell death induction process, and the later ROS production may play important
roles in events leading to cellular disruption. |
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Keywords: | Reactive oxygen species Programmed cell death Victorin Oat Mitochondria |
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