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RNA-seq of Arabidopsis thaliana seedlings growing in the presence of a bacterial synthetic community under full and low phosphate conditions [PBI_preTreat]

ABSTRACT: This study evaluates whether different pre-treatments (+Pi, -Pi and +Phi) influences the phosphate starvation transcriptional response triggered by a bacterial synthetic community in Arabidopsis seedlings.

ORGANISM(S): Arabidopsis thaliana

PROVIDER: GSE87337 | GEO | 2017/03/20

SECONDARY ACCESSION(S): PRJNA344452

REPOSITORIES: GEO

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RNA-seq of Arabidopsis thaliana seedlings growing in the presence of a bacterial synthetic community under full and low phosphate conditions

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Identification of plant vacuolar transporters mediating phosphate storage

Project description:Plant vacuoles serve as the primary intracellular compartments for inorganic phosphate (Pi) storage. Passage of Pi across vacuolar membranes plays a critical role in buffering the cytoplasmic Pi level against fluctuations of external Pi and metabolic activities. Here we demonstrate that the SPX-MFS proteins, designated as Phosphate Transporter 5 family (PHT5), also named Vacuolar Phosphate Transporter (VPT), function as vacuolar Pi transporters. Based on 31P-magnetic resonance spectroscopy analysis, Arabidopsis pht5;1 loss-of-function mutants accumulate less Pi and exhibit a lower vacuolar-to-cytoplasmic Pi ratio than controls. Conversely, overexpression of PHT5 leads to massive Pi sequestration into vacuoles and altered regulation of Pi starvation-responsive genes. Furthermore, we show that heterologous expression of OsSPX-MFS1, the rice PHT5 homolog, mediates Pi influx to yeast vacuoles. Our findings uncover a group of Pi transporters in vacuolar membranes that regulate the cytoplasmic Pi homeostasis required for the fitness of plant growth.

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Expression data from Col-0 and sp1,spx2 under phosphate starvation stress and recovery after resupplying phosphate

Project description:We performed a transcriptomic analysis of Pi-starvation and recovery after resupplying Pi in Arabidopsis thaliana (Columbia-0) wild type plants and double mutant spx1,spx2. Results show that SPX1 is a Pi-dependent inhibitor of the transcription factor PHR1, a central regulatory protein in the control of transcriptional responses to Pi starvation.

2014-09-30 | GSE52046 | GEO

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