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Quantifying Plant-Borne Carbon Assimilation by Root-Associating Bacteria.

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Summary

Researchers developed a new method using radioactive 11CO2 to trace carbon flow from maize to Herbaspirillum seropedicae bacteria. This technique quantifies microbial carbon assimilation, aiding plant-microbe interaction studies.

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Herbaspirillum seropedicaecarbon-11endophytic rhizobacteriagreen fluorescence reportingmaize rootsplant-borne carbon

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Area of Science:

  • Microbiology
  • Plant Science
  • Biochemistry

Background:

  • Herbaspirillum seropedicae is a plant growth-promoting rhizobacterium.
  • Understanding carbon exchange between plants and microbes is crucial but technologically limited.
  • Microorganisms rely on plant-derived carbon for energy.

Purpose of the Study:

  • To develop and validate a sensitive method for tracing carbon flow from maize to associated microbes.
  • To quantify microbial assimilation of plant-borne carbon.

Main Methods:

  • Administered radioactive 11CO2 to intact maize leaves, tracking 11C-photosynthate translocation to roots.
  • Utilized a green fluorescent protein (GFP) reporting strain (RAM10) of H. seropedicae for imaging microbial colonization.
  • Mechanically removed microbes from colonized root regions via sonication.
  • Measured fluorescence and gamma counts to correlate carbon-11 with colony-forming units.

Main Results:

  • Successfully traced carbon translocation from maize leaves to roots and subsequent microbial assimilation.
  • Quantified carbon-11 atoms in microbial samples, correlating with microbial abundance.
  • Demonstrated the sensitivity of the 11CO2 tracing method for microbial carbon uptake.

Conclusions:

  • The 11CO2 tracing method provides a sensitive tool to study plant-microbe carbon exchange.
  • This technique can be adapted for other microorganisms with optical reporting traits.
  • Advances understanding of rhizobacteria's reliance on plant carbon sources.