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  11. Artificial Root Exudates Affect Soil Phosphorus Activation In An Acidic Soil: Role Of Phosphorus-solubilizing Bacteria Via Rna Sequencing

Artificial Root Exudates Affect Soil Phosphorus Activation in an Acidic Soil: Role of Phosphorus-Solubilizing Bacteria via RNA Sequencing

Long Guo1,2,3,4, Chao Wang5,6, Ren Fang Shen3,4

  • 1School of Life and Environmental Science, Wenzhou University, Wenzhou, 325035, Zhejiang, China.

Current Microbiology
|July 11, 2025

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View abstract on PubMed

Summary
This summary is machine-generated.

Different root exudates activate soil phosphorus (P) in acidic soils through distinct chemical and biological pathways. Citric acid, malic acid, and mixed exudates increased available P, with specific bacteria responding to these compounds.

Area of Science:

  • Soil Science
  • Microbiology
  • Biochemistry

Background:

  • Plant root exudates play a crucial role in mobilizing soil phosphorus (P).
  • Understanding the specific effects of different root exudates on P activation in acidic, P-deficient soils is essential.
  • Root exudates influence soil microbial communities and enzyme activities involved in nutrient cycling.

Purpose of the Study:

  • To investigate the impact of four distinct root exudates (citric acid, malic acid, sucrose, and a mixed exudate) on soil available phosphorus (AP).
  • To assess the effects of these exudates on alkaline phosphatase (ALP) activity.
  • To determine the changes in phoD-harboring bacterial communities at both DNA and RNA levels in response to root exudates.

Main Methods:

  • Application of citric acid, malic acid, sucrose, and a mixed root exudate to acidic soil.

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  • Measurement of soil available phosphorus (AP) content.
  • Assay of alkaline phosphatase (ALP) activity at 6 and 30 hours.
  • Analysis of bacterial communities (phoD-harboring) at DNA (total) and RNA (active) levels.

    • Main Results:

    • Citric acid, malic acid, and the mixed root exudate significantly increased soil AP content.
    • All tested root exudates enhanced soil ALP activity at 6 hours; sucrose and the mixed exudate also showed effects at 30 hours.
    • Citric acid and sucrose stimulated active Bradyrhizobium at 6 hours and Collimonas at 30 hours, respectively.

    Conclusions:

    • Diverse root exudates exhibit varied capabilities in activating soil phosphorus in acidic environments.
    • Specific bacterial genera, Bradyrhizobium and Collimonas, are key responders to root exudates and contribute to potential ALP activity.
    • Root exudates differentially influence soil P availability and microbial community dynamics in acidic soils.