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Direct transcriptional integration of phosphate starvation and disease resistance in response to a root microbiome

ABSTRACT: Direct transcriptional integration of phosphate starvation and disease resistance in response to a root microbiome

PROVIDER: PRJNA344444 | ENA |

REPOSITORIES: ENA

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Direct transcriptional integration of phosphate starvation and disease resistance in response to a root microbiome

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Project description:Background: Over application of phosphate fertilizers in modern agriculture contaminates waterways and disrupts natural ecosystems. Nevertheless, this is a common practice among farmers, especially in developing countries as abundant fertilizers are believed to boost crop yields. The study of plant phosphate metabolism and its underlying genetic pathways is key to discovering methods of efficient fertilizer usage. The work presented here describes the first genome-wide resource on the molecular dynamics underpinning the response and recovery in roots and shoots of Arabidopsis thaliana to phosphate-starvation. Results: Genome-wide profiling revealed minimal overlap between root and shoot transcriptomes suggesting two independent phosphate-starvation regulons. Novel gene expression patterns were detected for over 1000 candidates and were classified as either initial, persistent, or latent responders. Comparative analysis to AtGenExpress identified novel cohorts of genes co-regulated across multiple stimuli. The hormone ABA displayed a dominant role in regulating many phosphate-responsive candidates. Analysis of co-regulation enabled the determination of primary versus redundant members of closely related gene families with respect to phosphate-starvation. Thus, among others, we show that PHO1 acts in shoot, whereas PHO1;H1 is likely the primary regulator in root. Conclusion: Our results uncover a much larger, staged responses to phosphate-starvation than previously described. To our knowledge, this work describes the highest resolution of genome-wide data on plant nutrient stress to date.

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The phosphate starvation response regulator PHR2 antagonizes arbuscule maintenance in Medicago

Project description:• Phosphate starvation response (PHR) transcription factors play essential roles in regulating phosphate uptake in plants through binding to the P1BS cis-element in the promoter of phosphate starvation response genes. Recently, PHRs were also shown to positively regulate arbuscular mycorrhizal colonization in rice and lotus by controlling the expression of a large set of symbiotic genes. However, their role in arbuscule development has remained unclear. In Medicago we previously showed that arbuscule degradation is controlled by two SPX proteins that are highly expressed in arbuscule-containing cells. Since SPX proteins bind to PHRs and repress their activity in a phosphate-dependent manner, we investigated whether arbuscule maintenance is also regulated by PHR. • Here, we show that MtPHR2 is a major regulator of the phosphate starvation response in Medicago. Knock-out of mtphr2 showed reduced phosphate starvation response, symbiotic gene expression and AM colonization levels. However, the arbuscules that formed showed less degradation, suggesting a negative role for PHR2 in arbuscule maintenance. This was supported by the observation that overexpression of MtPHR2 led to enhanced degradation of arbuscules. Although many arbuscule-induced genes contain P1BS elements in their promoters, we found that the P1BS cis-elements in the promoter of the symbiotic phosphate transporter MtPT4 are not required for arbuscule-containing cell specific expression. • These results indicate that MtSPX1 and MtSPX3 control arbuscule maintenance independent from PHR2. While MtPHR2 potentiates symbiotic gene expression and colonization, its activity in arbuscule-containing cells needs to be tightly controlled to maintain a successful symbiosis in Medicago.

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The response and recovery of Arabidopsis thaliana transcriptome to phosphate starvation

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2012-06-17 | E-GEOD-34004 | biostudies-arrayexpress

The response and recovery of Arabidopsis thaliana transcriptome to phosphate starvation [ATH1-121501]

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