Authors: Yao N.; Tada Y.; Sakamoto M.; Nakayashiki H.; Park P.; Tosa Y.; Mayama S.

Source: The Plant Journal, Volume 30, Number 5, June 2002 , pp. 567-579(13)

Publisher: Wiley-Blackwell

Abstract:

Summary

Apoptotic cell response in oats is induced by victorin, a host-selective toxin secreted by Cochliobolus victoriae and thought to exert toxicity by inhibiting mitochondrial glycine decarboxylase (GDC) in Pc-2/Vb oats. We examined the role of mitochondria, especially the organelle-derived production of reactive oxygen species (ROS), in the induction of apoptotic cell death. Cytofluorimetric analysis showed that victorin caused mitochondrial _m breakdown and mitochondrial oxidative burst. Ultrastructural analysis using a cytochemical assay based on the reaction of H₂O₂ with CeCl₃ detected H₂O₂ eruption at permeability transition pore-like sites on the mitochondrial membrane in oat cells treated with victorin. ROS generation preceded the apoptotic cell responses seen in chromatin condensation and DNA laddering. Both aminoacetonitrile (a specific GDC inhibitor) and antimycin A (a mitochondrial complex III inhibitor) also induced mitochondrial H₂O₂ eruption, and led to the apoptotic response in oat cells. ROS scavengers such as N-acetyl- l-cysteine and catalase suppressed the mitochondrial oxidative burst and delayed chromatin condensation and DNA laddering in the victorin- or antimycin A-treated leaves. These findings indicate possible involvement of mitochondria, especially mitochondrial-derived ROS generation, as an important regulator in controlling apoptotic cell death in oats.

Keywords: oats; apoptosis; mitochondria; reactive oxygen species; victorin; antimycin A

Document Type: Research article

DOI: http://dx.doi.org/10.1046/j.1365-313X.2002.01314.x

Affiliations: 1: Laboratory of Plant Pathology, Graduate School of Science and Technology, Kobe University, Rokkodai, Nada-ku, Kobe 657-8501, Japan

Publication date: 2002-06-01

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