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Title

Nitric oxide induces the alternative oxidase pathway in Arabidopsis seedlings deprived of inorganic phosphate

AuthorsRoyo, Beatriz ; Morán, José F. ; Ratcliffe, George; Gupta, Kapuganti J.
KeywordsPhosphate stress
Respiration.
Reactive oxygen species
Nitric oxide
Alternative oxidase
Arabidopsis thaliana
Inorganic phosphate
Issue Date2015
PublisherOxford University Press
CitationJournal of Experimental Botany 66(20): 6273-6280 (2015)
AbstractPhosphate starvation compromises electron fow through the cytochrome pathway of the mitochondrial electron transport chain, and plants commonly respond to phosphate deprivation by increasing fow through the alternative oxidase (AOX). To test whether this response is linked to the increase in nitric oxide (NO) production that also increases under phosphate starvation, Arabidopsis thaliana seedlings were grown for 15 d on media containing either 0 or 1 mM inorganic phosphate. The effects of the phosphate supply on growth, the production of NO, respiration, the AOX level and the production of superoxide were compared for wild-type (WT) seedlings and the nitrate reductase double mutant nia. Phosphate deprivation increased NO production in WT roots, and the AOX level and the capacity of the alternative pathway to consume electrons in WT seedlings; whereas the same treatment failed to stimulate NO production and AOX expression in the nia mutant, and the plants had an altered growth phenotype. The NO donor S-nitrosoglutathione rescued the growth phenotype of the nia mutants under phosphate deprivation to some extent, and it also increased the respiratory capacity of AOX. It is concluded that NO is required for the induction of the AOX pathway when seedlings are grown under phosphate-limiting conditions.
Publisher version (URL)http://doi.org/10.1093/jxb/erv338
URIhttp://hdl.handle.net/10261/141292
DOI10.1093/jxb/erv338
Identifiersissn: 1460-2431
e-issn: 0022-0957
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