3 years ago

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

Elena Baraza, Hans Lambers, Francisco Palma, Ricardo Aroca, Gregory R. Cawthray, Miquel Ribas-Carbó, Igor Florez-Sarasa, Antonia Romero-Munar, Néstor Fernández Del-Saz
Plants 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 h) P-sufficient pulse to plants grown under P limitation. Tests were also performed with plants colonized with arbuscular mycorrhizal (AM) fungi, which increased plant P concentration under reduced P availability. The in vivo activities of AOX and cytochrome oxidase (COX) 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 down-regulation of the transcription of genes encoding high-affinity Pi transporters, presumably to avoid P toxicity.

Publisher URL: http://onlinelibrary.wiley.com/resolve/doi

DOI: 10.1111/pce.13155

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