Dataset Information


Gene Expression Patterns in Potato Roots Associated with Greater Plant Growth at Low Phosphate Concentrations in the Rhizosphere

ABSTRACT: There are both financial and environmental reasons for optimising the use of phosphorus (P) fertilisers in potato production. One strategy to effect this is to develop genotypes with greater P use efficiency (PUE), which is generally defined as yield divided by the P available to the crop. In this article we report that potato (Solanum tuberosum L.) genotypes differ in their PUE, expressed both as yield in the field and as shoot biomass when grown hydroponically. When grown hydroponically, PUE was strongly correlated with P uptake efficiency (PUpE, defined as shoot P content), but not with physiological P utilisation efficiency (PUtE, defined as shoot biomass divided by shoot P content). Gene expression in roots differed between potato genotypes, and changed with P supply. A common transcriptional response to reduced P supply was determined in roots of four potato genotypes. This response comprised genes encoding enzymes involved in increasing rhizosphere P availability, phosphate transport, P-sparing metabolism, replacement of phospholipids in cell membranes, and various transcription factors. A specific transcriptional response associated only with roots of genotypes with high yields in the absence of P-fertiliser application in the field (Maris Piper and Stirling) was also identified. Genes involved in this response encoded various transcription factors, proteins facilitating water, solute and auxin transport, and enzymes involved in polyamine metabolism and the biosynthesis of tropane alkaloids.

ORGANISM(S): Solanum tuberosum  

SUBMITTER: Pete Hedley  

PROVIDER: E-MTAB-2990 | ArrayExpress | 2017-06-01


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