Journal
PLANT CELL AND ENVIRONMENT
Volume 28, Issue 9, Pages 1171-1178Publisher
WILEY
DOI: 10.1111/j.1365-3040.2005.01355.x
Keywords
Arabidopsis; cell respiration; cytokinins; mitochondria; nitric oxide; programmed cell death; senescence
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Cell death can be induced by cytokinin 6-benzylaminopurine (BA) at high dosage in suspension-cultured Arabidopsis cells. Herein, we provide evidence that BA induces nitric oxide (NO) synthesis in a dose-dependent manner. A reduction in cell death can be observed when the cytokinin is supplemented with the NO scavenger 2-(4-carboxyphenyl)-4,4,5,5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO) or the nitric oxide synthase (NOS) inhibitors: 2-aminoethyl-isothiourea (AET) and N-G.-monomethyl- L-arginine (L-NMMA), which suggests that NO is produced via a NOS and is a signalling component of this form of programmed cell death. In BA-treated cells, mitochondrial functionality is altered via inhibition of respiration. This inhibition can be prevented by addition of either cPTIO or AET implying that NO acts at the mitochondrial level.
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