title: Ethylene signaling in salt stress- and salicylic acid-induced programmed cell death in tomato suspension cells.
abstract: Salt stress- and salicylic acid (SA)-induced cell death can be activated by various signaling pathways including ethylene (ET) signaling in intact tomato plants. In tomato suspension cultures, a treatment with 250 mM NaCl increased the production of reactive oxygen species (ROS), nitric oxide (NO), and ET. The 10(-3) M SA-induced cell death was also accompanied by ROS and NO production, but ET emanation, the most characteristic difference between the two cell death programs, did not change. ET synthesis was enhanced by addition of ET precursor 1-aminocyclopropane-1-carboxylic acid, which, after 2 h, increased the ROS production in the case of both stressors and accelerated cell death under salt stress. However, it did not change the viability and NO levels in SA-treated samples. The effect of ET induced by salt stress could be blocked with silver thiosulfate (STS), an inhibitor of ET action. STS reduced the death of cells which is in accordance with the decrease in ROS production of cells exposed to high salinity. Unexpectedly, application of STS together with SA resulted in increasing ROS and reduced NO accumulation which led to a faster cell death. NaCl- and SA-induced cell death was blocked by Ca(2+) chelator EGTA and calmodulin inhibitor W-7, or with the inhibitors of ROS. The inhibitor of MAPKs, PD98059, and the cysteine protease inhibitor E-64 reduced cell death in both cases. These results show that NaCl induces cell death mainly by ET-induced ROS production, but ROS generated by SA was not controlled by ET in tomato cell suspension.
authors.affiliation: Department of Plant Biology, University of Szeged, Középfasor 52, 6701 Szeged, PO Box 654, Hungary.
authors.forename: Péter
authors.initials: P
authors.lastname: Poór
authors.forename: Judit
authors.initials: J
authors.lastname: Kovács
authors.forename: Dóra
authors.initials: D
authors.lastname: Szopkó
authors.forename: Irma
authors.initials: I
authors.lastname: Tari
mesh_terms: D017209:Apoptosis / Q000187:drug effects; D016923:Cell Death / Q000187:drug effects; D005030:Ethylenes / Q000737:chemistry / Q000378:metabolism*; D018551:Solanum lycopersicum / Q000737:chemistry / Q000166:cytology* / Q000187:drug effects / Q000378:metabolism*; D009569:Nitric Oxide / Q000378:metabolism / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism; D020156:Salicylic Acid / Q000378:metabolism / Q000494:pharmacology*; D055051:Salt-Tolerant Plants; D015398:Signal Transduction; D012965:Sodium Chloride / Q000494:pharmacology; D013312:Stress, Physiological / Q000187:drug effects / Q000502:physiology
chemical_list: D005030:Ethylenes; D017382:Reactive Oxygen Species; D009569:Nitric Oxide; D012965:Sodium Chloride; C036216:ethylene; D020156:Salicylic Acid