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Journal of Experimental Botany, Vol. 52, No. 361, pp. 1721-1730, August 1, 2001
© 2001 Oxford University Press

Original Papers

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

Valérie Houot, Philippe Etienne, Anne-Sophie Petitot, Stéphane Barbier, Jean-Pierre Blein and Lydie Suty1

UMR INRA-Université de Bourgogne, Phytopharmacie et Biochimie des Interactions Cellulaires, INRA BP 86510, 21065 Dijon cedex, France

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.

Key words: Apoptosis, DNA fragmentation, hydrogen peroxide, hypersensitive response, nuclear fragmentation, tobacco BY-2 cells, programmed cell death.


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