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The Phosphorus Cycle

The Phosphorus Cycle

Unlike carbon, water, and nitrogen, phosphorus is not present in the atmosphere as a gas. Instead, most phosphorus in the ecosystem exists as compounds, such as phosphate ions (PO43-), found in soil, water, sediment and rocks. Phosphorus is often a limiting nutrient (i.e., in short supply). Consequently, phosphorus is added to most agricultural fertilizers, which can cause environmental problems related to runoff in aquatic ecosystems.

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Endophyte-Promoted Phosphorus Solubilization in Populus.

Tamas Varga¹, Kim K Hixson¹, Amir H Ahkami¹

¹Environmental Molecular Sciences Laboratory, Earth and Biological Sciences Directorate, Pacific Northwest National Laboratory, Richland, WA, United States.

Frontiers in Plant Science

|November 16, 2020

Summary

This summary is machine-generated.

Endophytic bacteria enhance phosphorus uptake in poplar plants by solubilizing soil phosphate. These microbes alter root architecture and facilitate nutrient release within plant tissues, improving plant growth in low-nutrient conditions.

Keywords:

Populus endophytes phosphorus poplar solubilization synchrotron x-ray fluorescence x-ray absorption near edge structure x-ray computed tomography

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Area of Science:

Plant Science
Microbiology
Biogeochemistry

Background:

Phosphorus is vital for plant growth but often unavailable due to soil chemistry.
Endophytes are microorganisms living within plants that can supply essential nutrients.
Phosphate solubilization by microbes is crucial for plant nutrient acquisition.

Purpose of the Study:

To investigate the molecular impact of phosphate-solubilizing endophytic bacteria on wild poplar (Populus trichocarpa).
To provide direct evidence of endophyte-promoted phosphorus uptake in poplar plants.

Main Methods:

X-ray imaging and spectroscopy (including synchrotron X-ray fluorescence spectromicroscopy).
Proteomics analysis of poplar roots.
Tomography-based root imaging.
Protein network analysis.

Main Results:

Direct evidence of endophyte-promoted phosphorus uptake in poplar roots was observed.
Solubilized phosphate was found in both organic and inorganic forms within plant tissues.
Inoculation with phosphate-solubilizing bacteria significantly altered root biomass and architecture.
Proteomics identified novel proteins and pathways involved in enhanced phosphorus uptake.

Conclusions:

Endophytic bacteria play a significant role in enhancing phosphorus acquisition in poplar.
Endophytes may facilitate the re-release of insoluble phosphates within plant tissues.
This study deepens the understanding of symbiotic associations between poplar and endophytic bacteria for nutrient uptake.