NDLI: Ozone-Sensitive Arabidopsis rcd1 Mutant Reveals Opposite Roles for Ethylene and Jasmonate Signaling Pathways in Regulating Superoxide-Dependent Cell Death

Content Provider	PubMed Central
Author	Overmyer, Kirk Tuominen, Hannele Kettunen, Reetta Betz, Christian Christian, Langebartels Sandermann, Heinrich Kangasjärvi, Jaakko
Copyright Year	2000
Abstract	We have isolated a codominant Arabidopsis mutant, radical-induced cell death1 (rcd1), in which ozone (O3) and extracellular superoxide (O2 •−), but not hydrogen peroxide, induce cellular O2 •− accumulation and transient spreading lesions. The cellular O2 •− accumulation is ethylene dependent, occurs ahead of the expanding lesions before visible symptoms appear, and is required for lesion propagation. Exogenous ethylene increased O2 •−-dependent cell death, whereas impairment of ethylene perception by norbornadiene in rcd1 or ethylene insensitivity in the ethylene-insensitive mutant ein2 and in the rcd1 ein2 double mutant blocked O2 •− accumulation and lesion propagation. Exogenous methyl jasmonate inhibited propagation of cell death in rcd1. Accordingly, the O3-exposed jasmonate-insensitive mutant jar1 displayed spreading cell death and a prolonged O2 •− accumulation pattern. These results suggest that ethylene acts as a promoting factor during the propagation phase of developing oxyradical-dependent lesions, whereas jasmonates have a role in lesion containment. Interaction and balance between these pathways may serve to fine-tune propagation and containment processes, resulting in alternate lesion size and formation kinetics.
Starting Page	1849
File Format	PDF
ISSN	1532298X
e-ISSN	1532298X
Journal	The Plant Cell
Issue Number	10
Volume Number	12
Language	English
Publisher	American Society of Plant Physiologists
Publisher Date	2000-10-01
Access Restriction	Open
Rights Holder	American Society of Plant Physiologists
Subject Keyword	Research in Higher Education
Content Type	Text
Resource Type	Article
Subject	Cell Biology Plant Science

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