# Single-cell Raman insights into microbial strategies for sustainable phosphorus mining and recycling

## TL;DR

This paper explores how microbes can help manage phosphorus sustainably using a strategy called MRB, supported by single-cell Raman spectroscopy.

## Contribution

The paper introduces the use of single-cell Raman spectroscopy to study and enhance microbial phosphorus cycling strategies.

## Key findings

- Phosphorus-solubilizing microorganisms mobilize phosphorus effectively.
- Polyphosphate-accumulating organisms retain and buffer phosphorus through storage.
- Single-cell Raman spectroscopy enables non-destructive, in situ analysis of functional P-cycling bacteria.

## Abstract

Phosphorus (P) management faces a dual crisis of resource depletion and eutrophication, underscoring the need for a sustainable P cycling model. This review systematically elaborates on the microorganism-driven “Mobilization, Retention and Buffering” (MRB) strategy to enable sustainable P cycling. In this framework, phosphorus-solubilizing microorganisms (PSMs) mobilize P, while polyphosphate (poly-P)-accumulating organisms (PAOs) ensure efficient P retention and buffering via poly-P storage. We highlight the unique strengths of single-cell Raman spectroscopy (SCRS), including culture-independent and non-destructive analysis at single-cell resolution, and discuss how it supports in situ identification, mechanistic characterization, and mining of functional P-cycling bacteria. Finally, we outline SCRS-enabled opportunities to advance the MRB strategy for efficient P recovery, recycling, and utilization.

Diagram illustrating a phosphorus cycle in agro-ecosystems. It includes composting, bio-fertilizer application, minimal runoff, wastewater treatment, and sludge recovery. Two cellular mechanisms—mobilization by PSMs and retention by PAOs—are depicted, each linked to specific genes and Raman spectra, with arrows indicating process flow and cycling.