Abstract:
:We initially compared lipid peroxidation profiles in tobacco (Nicotiana tabacum) leaves during different cell death events. An upstream oxylipin assay was used to discriminate reactive oxygen species (ROS)-mediated lipid peroxidation from 9- and 13-lipoxygenase (LOX)-dependent lipid peroxidation. Free radical-mediated membrane peroxidation was measured during H(2)O(2)-dependent cell death in leaves of catalase-deficient plants. Taking advantage of these transgenic plants, we demonstrate that, under light conditions, H(2)O(2) plays an essential role in the execution of cell death triggered by an elicitor, cryptogein, which provokes a similar ROS-mediated lipid peroxidation. Under dark conditions, however, cell death induction by cryptogein was independent of H(2)O(2) and accompanied by products of the 9-LOX pathway. In the hypersensitive response induced by the avirulent pathogen Pseudomonas syringae pv syringae, both 9-LOX and oxidative processes operated concurrently, with ROS-mediated lipid peroxidation prevailing in the light. Our results demonstrate, therefore, the tight interplay between H(2)O(2) and lipid hydroperoxides and underscore the importance of light during the hypersensitive response.
journal_name
Plant Physioljournal_title
Plant physiologyauthors
Montillet JL,Chamnongpol S,Rustérucci C,Dat J,van de Cotte B,Agnel JP,Battesti C,Inzé D,Van Breusegem F,Triantaphylidès Cdoi
10.1104/pp.105.059907subject
Has Abstractpub_date
2005-07-01 00:00:00pages
1516-26issue
3eissn
0032-0889issn
1532-2548pii
pp.105.059907journal_volume
138pub_type
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