Hydrogen peroxide induces programmed cell death features in cultured tobacco BY-2 cells, in a dose-dependent manner

被引:159
作者
Houot, V [1 ]
Etienne, P [1 ]
Petitot, AS [1 ]
Barbier, S [1 ]
Blein, JP [1 ]
Suty, L [1 ]
机构
[1] Univ Bourgogne, INRA, UMR, F-21065 Dijon, France
关键词
apoptosis; DNA fragmentation; hydrogen peroxide; hypersensitive response; nuclear fragmentation; tobacco BY-2 cells; programmed cell death;
D O I
10.1093/jexbot/52.361.1721
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
Active oxygen species (AOS), especially hydrogen peroxide, play a critical role in the defence of plants against invading pathogens and in the hypersensitive response (HR). This is characterized by the induction of a massive production of AOS and the rapid appearance of necrotic lesions is considered as a programmed cell death (PCD) process during which a limited number of cells die at the site of infection. This work was aimed at investigating the mode of cell death observed in cultures of BY-2 tobacco cells exposed to H2O2. It was shown that H2O2 is able to induce various morphological cell death features in cultured tobacco BY-2 cells. The hallmarks of cell death observed with fluorescent and electron microscopy differed greatly with the amount of H2O2 added to the cell culture. The appearance of nuclear fragmentation similar to 'apoptotic bodies' associated with a fragmentation of the nuclear DNA into small fragments appear for almost 18% of the cells treated with 12.5 mM H2O2. The early stages of the induction of this PCD process consisted in cell shrinkage and chromatin condensation at the periphery of the nucleus. Above 50 mM, H2O2 induces high necrotic cell death. These data suggest that H2O2-induced cell damage is associated with the induction of various cell death processes that could be involved differently in plant defence reactions.
引用
收藏
页码:1721 / 1730
页数:10
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