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Title

Phosphorus concentration coordinates a respiratory bypass, synthesis and exudation of citrate, and the expression of high-affinity phosphorus transporters in Solanum lycopersicum

AuthorsFernández Del-Saz, Néstor; Romero Munar, Antonia; Cawthray, Gregory R.; Palma, Francisco; Aroca, Ricardo; Baraza Ruiz, Elena; Flórez Sarasa, I. D.; Lambers, Hans; Ribas-Carbó, Miquel
KeywordsOxygen Isotope fractionation
Alternative Oxidase
Mycorrhiza
Phosphorus limitation
Respiratory metabolism
Issue Date2018
PublisherBlackwell Publishing
CitationPlant, Cell and Environment 41: 865- 875 (2018)
AbstractPlants exhibit respiratory bypasses (e.g., the alternative oxidase [AOX]) and increase the synthesis of carboxylates in their organs (leaves and roots) in response to phosphorus (P) deficiency, which increases P uptake capacity. They also show differential expression of high-affinity inorganic phosphorus (Pi) transporters, thus avoiding P toxicity at a high P availability. The association between AOX and carboxylate synthesis was tested in Solanum lycopersicum plants grown at different soil P availability, by using plants grown under P-sufficient and P-limiting conditions and by applying a short-term (24 hr) P-sufficient pulse to plants grown under P limitation. Tests were also performed with plants colonized with arbuscular mycorrhizal fungi, which increased plant P concentration under reduced P availability. The in vivo activities of AOX and cytochrome oxidase were measured together with the concentration of carboxylates and the P concentration in plant organs. Gene transcription of Pi transporters (LePT1 and LePT2) was also studied. A coordinated response between plant P concentration with these traits was observed, indicating that a sufficient P availability in soil led to a suppression of both AOX activity and synthesis of citrate and a downregulation of the transcription of genes encoding high-affinity Pi transporters, presumably to avoid P toxicity.
Publisher version (URL)https://doi.org/10.1111/pce.13155
URIhttp://hdl.handle.net/10261/164355
Identifiersdoi: 10.1111/pce.13155
e-issn: 1365-3040
issn: 0140-7791
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