期刊
PLANT CELL
卷 12, 期 10, 页码 1849-1862出版社
AMER SOC PLANT BIOLOGISTS
DOI: 10.1105/tpc.12.10.1849
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We have isolated a codominant Arabidopsis mutant, radical-induced cell death1 (rcd1), in which ozone (O-3) and extracellular superoxide (O-2(.-)), but not hydrogen peroxide, induce cellular O-2(.-) accumulation and transient spreading lesions. The cellular O-2(.-) accumulation is ethylene dependent, occurs ahead of the expanding lesions before visible symptoms appear, and is required for lesion propagation, Exogenous ethylene increased O-2(.-)-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 O-2(.-) accumulation and lesion propagation, Exogenous methyl jasmonate inhibited propagation of cell death in rcd1. Accordingly, the O-3-exposed jasmonate-insensitive mutant jar1 displayed spreading cell death and a prolonged O-2(.-) 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.
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